這樣子的 我在買到這玩意之後從廠商副的程式碼和插線方法都非常順利 但是問題是我想把程式改成一次感測兩組時發生了問題 原始程式上的 int DS18S20_Pin = 2; 我改成了Pin52腳輸入 及加另一組Pin50輸入 int DS18S20_Pin = 52; int DS18S20_Pin2 = 50; 直到這裡都可以 問題在OneWire ds(DS18S20_Pin);下新增了一句OneWire ds(DS18S20_Pin2);就出事了 想請問為什麼這樣就出事了呢? OneWire ds(DS18S20_Pin); // on digital pin 52 OneWire ds(DS18S20_Pin2); // on digital pin 50 如果想一次測4支感測器應該怎麼做呢? 可不可以請大家不吝賜教? 以下是原始碼: #include <OneWire.h> int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2 //Temperature chip i/o OneWire ds(DS18S20_Pin); // on digital pin 2 void setup(void) { Serial.begin(9600); } void loop(void) { float temperature = getTemp(); Serial.println (temperature); delay(1000); //just here to slow down the output so it is easier to read } 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 = 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; } |
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