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| == Vastaanottimen käyttö ==
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| Tämä laite vastaanottaa 433 MHz -radioviestejä, joissa on kiinteitä DIP-koodeja. Jokaisella DIP-koodilla on pysyvä '''ID-numero (1–16)'''. Näytöllä näkyy aina yksi koodi kerrallaan.
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| [[File:Vastaanotin-oled.jpg|thumb|Vastaanottimen oled näyttö]]
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| === Mitä näyttö kertoo? ===
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| Näyttö on jaettu kahteen osaan:
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|
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|
| * Vasemmassa reunassa (suurena):
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| ** '''ID-numero''' (esim. <code>5</code>)
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| ** '''Huutomerkki <code>!</code>''' näkyy, jos koodi on '''aktiivinen''' (viesti saatu viimeisen 5 minuutin aikana)
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|
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| * Oikeassa reunassa (pienellä tekstillä):
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| # '''Ylärivi:''' Esim. <code>2/(3)/[5]</code>
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| #* <code>2</code> = aktiivisten lähetysten määrä
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| #* <code>(3)</code> = passiivisten lähetysten määrä (viesti yli 5 min vanha)
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| #* <code>[5]</code> = kaikkien vastaanotettujen lähetyksien määrä
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| # '''Toinen rivi (vain jos koodi on passiivinen):'''
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| #* Aika viimeisestä viestistä minuutteina (esim. <code>17m</code>)
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| # '''Kolmas rivi (vain jos passiivinen):'''
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| #* Sana <code>PASSIVE</code>
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| # '''Alarivi:'''
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| #* DIP-koodi (esim. <code>0100</code>)
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|
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| == ID Dip taulukko ==
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| {| class="wikitable"
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| !ID
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| !DIP-koodi
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| |-
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| |1
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| |0000
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| |-
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| |2
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| |0001
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| |-
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| |3
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| |0010
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| |-
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| |4
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| |0011
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| |-
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| |5
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| |0100
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| |-
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| |6
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| |0101
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| |-
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| |7
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| |0110
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| |-
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| |8
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| |0111
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| |-
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| |9
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| |1000
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| |-
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| |10
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| |1001
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| |-
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| |11
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| |1010
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| |-
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| |12
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| |1011
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| |-
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| |13
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| |1100
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| |-
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| |14
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| |1101
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| |-
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| |15
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| |1110
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| |-
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| |16
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| |1111
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| |}
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|
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| == Vastaanottimen kytkentäkaavio ja tarvittavat osat ==
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|
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| == Tarvittavat osat: ==
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| {| class="wikitable"
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| !Komponentti
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| !Määrä
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| |-
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| |Arduino Nano v3
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| |1
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| |-
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| |433 MHz ASK-radiovastaanotin
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| |1
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| |-
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| |OLED-näyttö (128×32, I2C, SSD1306)
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| |1
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| |-
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| |Momenttikytkin (painonappi)
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| |1
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| |}
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|
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| ==== Näytön kytkentä ====
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| {| class="wikitable"
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| !OLED-pinni
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| !Arduino Nano -pinni
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| !Selitys
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| |-
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| |VCC
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| |5V
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| |Virransyöttö
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| |-
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| |GND
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| |GND
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| |Maa
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| |-
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| |SDA
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| |A4
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| |I2C-data
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| |-
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| |SCL
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| |A5
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| |I2C-kello
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| |}
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|
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| ==== Vastaanottimen kytkentä ====
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| {| class="wikitable"
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| !Vastaanottimen pinni
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| !Arduino Nano -pinni
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| !Selitys
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| |-
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| |VCC
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| |5V
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| |Virransyöttö
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| |-
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| |GND
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| |GND
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| |Maa
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| |-
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| |DATA (OUT)
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| |D12
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| |Vastaanottodata
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| |}
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|
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| ==== Näytön pikarullausnappi ====
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| {| class="wikitable"
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| !Nappi
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| !Arduino Nano
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| !Selitys
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| |-
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| |1
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| |D2
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| |Luku (INPUT_PULLUP)
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| |-
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| |2
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| |GND
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| |Painettaessa yhdistää maahan
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| |}
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|
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| ==== Lisää tarvittavat kirjastot ====
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|
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| * RadioHead (RH_ASK)
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| * Adafruit SSD1306
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| * Adafruit GFX
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| * Wire
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|
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| == Lähettimen lähdekoodi ==
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| <syntaxhighlight lang="c++" line="1">#include <RH_ASK.h>
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| #include <Wire.h>
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| #include <Adafruit_GFX.h>
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| #include <Adafruit_SSD1306.h>
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|
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| #define SCREEN_WIDTH 128
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| #define SCREEN_HEIGHT 32
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| #define OLED_RESET -1
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| Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
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|
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| // Radiovastaanotin
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| RH_ASK driver(1000, 12, 11, 10); // RX = D12
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|
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| // Ajastukset
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| const unsigned long ENTRY_TIMEOUT = 30 * 60 * 1000UL; // 30 min
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| const unsigned long DISPLAY_DURATION = 2500; // 2.5 s
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|
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| // Seuraava ruutu nappi
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| #define BUTTON_PIN 2
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|
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| // Kiinteät DIP-koodit (16 kpl)
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| const char* dipIdMap[16] = {
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| "0000", "0001", "0010", "0011",
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| "0100", "0101", "0110", "0111",
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| "1000", "1001", "1010", "1011",
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| "1100", "1101", "1110", "1111"
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| };
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|
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| //Vilkku
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| bool blinkState = false;
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| unsigned long lastBlink = 0;
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| const unsigned long BLINK_INTERVAL = 500;
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|
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|
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| // Tallennetaan viimeisin aikaleima DIP-koodeille
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| unsigned long dipSeen[16] = {0};
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|
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| // Painallusmuuttujat
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| bool buttonPressed = false;
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| unsigned long lastDisplaySwitch = 0;
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|
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| // CRC8 Dallas/Maxim
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| byte crc8_dallas(const char* data, uint8_t len) {
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| byte crc = 0x00;
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| for (uint8_t i = 0; i < len; i++) {
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| crc ^= data[i];
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| for (uint8_t j = 0; j < 8; j++) {
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| crc = (crc & 0x80) ? (crc << 1) ^ 0x31 : (crc << 1);
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| }
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| }
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| return crc;
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| }
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|
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| // Palauttaa ID:n 1–16 tai 0 jos tuntematon
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| int getDipId(const char* dip) {
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| for (int i = 0; i < 16; i++) {
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| if (strncmp(dipIdMap[i], dip, 4) == 0) {
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| return i + 1;
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| }
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| }
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| return 0;
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| }
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|
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| void setup() {
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| // Serial.begin(9600);
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| // delay(1000);
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|
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| pinMode(BUTTON_PIN, INPUT_PULLUP);
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|
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| if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
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| display.clearDisplay();
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| display.setTextSize(1);
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| display.setCursor(0, 0);
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| display.println(F("OLED ei vastaa"));
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| display.display();
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| while (1); // Pysäyttää ohjelman
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| }
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|
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| display.clearDisplay();
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| display.setTextSize(1);
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| display.setTextColor(SSD1306_WHITE);
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| display.setCursor(0, 0);
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| display.println(F("Odotetaan..."));
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| display.display();
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|
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|
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| if (!driver.init()) {
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| display.clearDisplay();
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| display.setCursor(0, 0);
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| display.println(F("Radio ei vastaa"));
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| display.display();
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| while (1); //
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| }
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|
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|
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| pinMode(12, INPUT);
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| }
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|
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| void loop() {
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| receiveRadio();
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| cleanExpiredEntries();
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| checkButton();
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| updateDisplay();
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| delay(10);
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| }
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|
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| void checkButton() {
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| static bool prevState = HIGH;
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| bool state = digitalRead(BUTTON_PIN);
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|
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| if (prevState == HIGH && state == LOW) {
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| buttonPressed = true;
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| }
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|
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| prevState = state;
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| }
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|
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| void receiveRadio() {
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| uint8_t buf[32];
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| uint8_t buflen = sizeof(buf);
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|
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| if (driver.recv(buf, &buflen)) {
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| if (buflen < 8 || buf[0] != 'S' || buf[5] != 'E') return;
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|
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| byte expectedCrc = crc8_dallas((char*)buf, 6);
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| char crcStr[3] = { (char)buf[6], (char)buf[7], '\0' };
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| byte receivedCrc = strtoul(crcStr, NULL, 16);
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| if (expectedCrc != receivedCrc) return;
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|
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| char dip[5];
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| memcpy(dip, &buf[1], 4);
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| dip[4] = '\0';
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|
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| int dipId = getDipId(dip);
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|
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| if (dipId <= 0) {
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| //Serial.print(F("⚠️ Tuntematon DIP: "));
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| //Serial.println(dip);
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| return;
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| }
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| /*
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| Serial.print(F("✅ DIP "));
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| Serial.print(dip);
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| Serial.print(F(" → ID "));
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| Serial.println(dipId);
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| */
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|
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| dipSeen[dipId - 1] = millis(); // Päivitä aikaleima
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| }
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| }
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|
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| void cleanExpiredEntries() {
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| unsigned long now = millis();
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| for (int i = 0; i < 16; i++) {
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| if (dipSeen[i] != 0 && now - dipSeen[i] > ENTRY_TIMEOUT) {
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| dipSeen[i] = 0; // Nollaa aikaleima = ei enää aktiivinen
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| }
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| }
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| }
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|
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| void updateDisplay() {
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| static int currentActiveIndex = -1;
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| unsigned long now = millis();
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|
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| int allSeenIndices[16];
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| int seenCount = 0;
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| int activeCount = 0;
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| int passiveCount = 0;
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|
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| // Kerätään vastaanotetut DIP:t ja lasketaan aktiiviset/passiiviset
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| for (int i = 0; i < 16; i++) {
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| if (dipSeen[i] != 0) {
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| allSeenIndices[seenCount++] = i;
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| unsigned long ageMin = (now - dipSeen[i]) / 60000UL;
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| if (ageMin <= 5) {
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| activeCount++;
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| } else {
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| passiveCount++;
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| }
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| }
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| }
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|
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| display.clearDisplay();
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|
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| if (seenCount <= 0) {
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| // Jos ei ole aktiivisia koodeja
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| currentActiveIndex = -1;
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| display.setTextSize(1);
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| display.setCursor(0, 0);
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| display.println(F("Kuunnellaan radiota..."));
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|
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| // Vilkku aina näkyviin
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| if (now - lastBlink >= BLINK_INTERVAL) {
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| blinkState = !blinkState;
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| lastBlink = now;
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| }
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| if (blinkState) {
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| display.fillRect(SCREEN_WIDTH - 3, SCREEN_HEIGHT - 3, 2, 2, SSD1306_WHITE);
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| }
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|
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| display.display();
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| return;
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| }
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|
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| // Päivitä ruutu vain tarvittaessa
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| if (now - lastDisplaySwitch >= DISPLAY_DURATION || buttonPressed) {
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| currentActiveIndex = (currentActiveIndex + 1) % seenCount;
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| lastDisplaySwitch = now;
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| buttonPressed = false;
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| }
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|
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| // Haetaan näytettävä DIP
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| int dipIndex = allSeenIndices[currentActiveIndex];
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| int id = dipIndex + 1;
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|
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| unsigned long ageMin = (now - dipSeen[dipIndex]) / 60000UL;
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| bool isPassive = (ageMin > 5);
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|
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| // Vasemmalle iso ID-numero
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| display.setTextSize(4);
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| display.setCursor(0, 0);
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| display.print(id);
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| if (!isPassive) {
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| display.print("!");
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| }
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|
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| // Oikealle tilastorivi
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| display.setTextSize(1);
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| int xTextStart = SCREEN_WIDTH - 6 * 10;
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| char indexStr[20];
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| snprintf(indexStr, sizeof(indexStr), "%d/(%d)/[%d]", activeCount, passiveCount, seenCount);
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| display.setCursor(xTextStart, 0);
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| display.print(indexStr);
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|
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| // PASSIVE-merkinnät jos yli 5 min vanha
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| if (isPassive) {
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| char timeStr[10];
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| snprintf(timeStr, sizeof(timeStr), "%lum", ageMin);
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| display.setCursor(xTextStart, 8);
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| display.print(timeStr);
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|
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| display.setCursor(xTextStart, 16);
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| display.print(F("PASSIVE"));
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| }
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|
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| // DIP-koodi alariville
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| display.setCursor(xTextStart, SCREEN_HEIGHT - 8);
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| display.print(dipIdMap[dipIndex]);
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|
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| // Vilkku (aina näkyvissä)
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| if (now - lastBlink >= BLINK_INTERVAL) {
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| blinkState = !blinkState;
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| lastBlink = now;
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| }
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| if (blinkState) {
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| display.fillRect(SCREEN_WIDTH - 3, SCREEN_HEIGHT - 3, 2, 2, SSD1306_WHITE);
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| }
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|
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| display.display();
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| }</syntaxhighlight>
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