117 lines
2.3 KiB
Arduino
117 lines
2.3 KiB
Arduino
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#define PIN_TX 4
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uint8_t msg[5];
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uint8_t id = 0x2C;
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uint8_t channel = 0x01;
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bool batteryOK = 0;// 0 means OK
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uint8_t humidity = 69;
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float temperature = 1.;
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void setup() {
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Serial.begin(9600);
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pinMode(PIN_TX, OUTPUT);
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}
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void loop() {
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// put your main code here, to run repeatedly:
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temperature += 1.;
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if (temperature >= 35.) temperature = 1.;
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buildMsg();
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sendRF();
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delay(10000);
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}
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void buildMsg(){
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// put your setup code here, to run once:
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msg[0] = id;
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msg[4] = channel + ((humidity%10) << 4 );
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msg[3] = humidity/10;
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int binTemp = ((temperature * 9./5) + 32 + 90)*10;
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msg[3] += (binTemp & 0x0F) << 4;
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msg[2] = binTemp >> 4;
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msg[1] = batteryOK << 2;
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msg[1] = (msg[1] & 0x0F) | (msg[4] & 0x0F) << 4;
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// crc4() only works with full bytes
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uint8_t crc = crc4(msg, 4, 0x13, 0); // Koopmann 0x9, CCITT-4; FP-4; ITU-T G.704
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crc ^= msg[4] >> 4; // last nibble is only XORed
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msg[1] = (msg[1] & 0x0F) | (crc & 0x0F) << 4;
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for (int i=0; i<=4; i++){
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Serial.print(msg[i],HEX);
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Serial.print(" ");
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}
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}
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uint8_t crc4(uint8_t const message[], unsigned nBytes, uint8_t polynomial, uint8_t init)
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{
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unsigned remainder = init << 4; // LSBs are unused
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unsigned poly = polynomial << 4;
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unsigned bit;
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while (nBytes--) {
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remainder ^= *message++;
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for (bit = 0; bit < 8; bit++) {
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if (remainder & 0x80) {
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remainder = (remainder << 1) ^ poly;
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} else {
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remainder = (remainder << 1);
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}
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}
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}
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return remainder >> 4 & 0x0f; // discard the LSBs
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}
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void sendRF()
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{
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/*low long 4000
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low short 1800
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high short 700
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*/
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for (int n=0; n<6; n++)
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{
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for (int i=0; i<10; i++){
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digitalWrite(PIN_TX, !(i%2));
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delayMicroseconds(1000);
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}
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delayMicroseconds(7000);
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for (int i = 0; i<5; i++) {
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for (int b = 7; b>=0; b--) {
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digitalWrite(PIN_TX, HIGH);
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delayMicroseconds(700);
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digitalWrite(PIN_TX, LOW);
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if (bitRead(msg[i], b)){
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delayMicroseconds(4000);
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}
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else{
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delayMicroseconds(1800);
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}
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}
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}
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digitalWrite(PIN_TX, HIGH);
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delayMicroseconds(1000);
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digitalWrite(PIN_TX, LOW);
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delayMicroseconds(16000);
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}
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}
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