Alright so my onewire temp sensors just came in the mail, I tried hooking one up, but instead of a readout I just get "no more addresses".
I have pin 1 to GND, pin 2 to arduino pin 10, and pin 3 to +5, with a 4.7k ohm resistor between pin 2 and 3, and this is the sketch I am using. (needs to be this one or one of similar size, since I need to add some more and put it on an attiny85)
#include <OneWire.h>
/* DS18S20 Temperature chip i/o */
OneWire ds(10); // on pin 10
void setup(void) {
Serial.begin(9600);
}
void loop(void) {
byte i;
byte present = 0;
byte data[12];
byte addr[8];
if ( !ds.search(addr)) {
Serial.print("No more addresses.\n");
ds.reset_search();
delay(250);
return;
}
Serial.print("R=");
for( i = 0; i < 8; i++) {
Serial.print(addr[i], HEX);
Serial.print(" ");
}
if ( OneWire::crc8( addr, 7) != addr[7]) {
Serial.print("CRC is not valid!\n");
return;
}
if ( addr[0] != 0x10) {
Serial.print("Device is not a DS18S20 family device.\n");
return;
}
// The DallasTemperature library can do all this work for you!
ds.reset();
ds.select(addr);
ds.write(0x44,1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
Serial.print("P=");
Serial.print(present,HEX);
Serial.print(" ");
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
Serial.print(data[i], HEX);
Serial.print(" ");
}
Serial.print(" CRC=");
Serial.print( OneWire::crc8( data, 8), HEX);
Serial.println();
}