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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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