nano

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Arduino nano, 1-wire Temp mit 433MHz-Funk an Pi

http://blog.riyas.org/2014/06/cheap-remote-wireless-temperature-sensor-with-arduino-uno-433mhz-rfmodule.html

Codebeispiel für nano


//ISCH! Vorsicht, die Pins sind "digital pins", steht hier 8 dann wird D8 gemeint und nicht Pin 8
 //simple wireless temperature tranmitter   
 // DS18S20 sensor is connected to pin 8  
 // Rf modules tranmit (data) pin is connected to pin 7 on the arduino 
 // More info: http://blog.riyas.org/2014/06/cheap-remote-wireless-temperature-sensor-with-arduino-uno-433mhz-rfmodule.html 
 #include <VirtualWire.h>  
 #include <OneWire.h>   
 int DS18S20_Pin = 8; //DS18S20 Signal pin on digital 2  
 OneWire ds(DS18S20_Pin); // on digital pin 2  
 char *controller;  
 char msg[6];  
 void setup()   
   {  
      Serial.begin(9600);  
      pinMode(13,OUTPUT);  
      vw_set_ptt_inverted(true); //  
      vw_set_tx_pin(7);  
      vw_setup(4000);// speed of data transfer Kbps  
   }  
 void loop()  
   {   
      float temperature = getTemp();  
      Serial.println(temperature);  
      dtostrf(temperature, 6, 2, msg);  
      digitalWrite(13,0);  
      vw_send((uint8_t *)msg, strlen(msg)); // Send temperature.  
      vw_wait_tx();  
      delay(500);  
      digitalWrite(13,1); // blink the led on pin13  
      delay(500);  
   }  
 float getTemp()  
 {  
  //returns the temperature from one DS18S20 in DEG Celsius  
  byte data[12];  
  byte addr[8];  
  if ( !ds.search(addr)) {  
    //no more sensors on chain, reset search  
    ds.reset_search();  
    return -1000;  
  }  
  if ( OneWire::crc8( addr, 7) != addr[7]) {  
    Serial.println("CRC is not valid!");  
    return -1000;  
  }  
  if ( addr[0] != 0x10 && addr[0] != 0x28) {  
    Serial.print("Device is not recognized");  
    return -1000;  
  }  
  ds.reset();  
  ds.select(addr);  
  ds.write(0x44,1); // start conversion, with parasite power on at the end  
  byte present = ds.reset();  
  ds.select(addr);    
  ds.write(0xBE); // Read Scratchpad  
  for (int i = 0; i < 9; i++) { // we need 9 bytes  
   data[i] = ds.read();  
  }  
  ds.reset_search();  
  byte MSB = data[1];  
  byte LSB = data[0];  
  float tempRead = ((MSB << 8) | LSB); //using two's compliment  
  float TemperatureSum = tempRead / 16;  
  return TemperatureSum;  
 }