I haven't yet, as I don't have a serial port within easy access. I will try it though, just to make sure. I used the OneWire library available for the arduino development environment, which many have reported success with on identical hardware (the arduino diecimila is an AVR ATmega168 @ 16MHz), so while possible, it would be unlikely that the timing worked for all those others but not for mine. They won't even respond to a reset, which is supposed to pull the pin LOW. The reset code is pretty simple:
//
// Perform the onewire reset function. We will wait up to 250uS for
// the bus to come high, if it doesn't then it is broken or shorted
// and we return a 0;
//
// Returns 1 if a device asserted a presence pulse, 0 otherwise.
//
uint8_t OneWire::reset() {
uint8_t r;
uint8_t retries = 125;
// wait until the wire is high... just in case
pinMode(pin,INPUT);
do {
if ( retries-- == 0) return 0;
delayMicroseconds(2);
} while( !digitalRead( pin));
digitalWrite(pin,0); // pull low for 500uS
pinMode(pin,OUTPUT);
delayMicroseconds(500);
pinMode(pin,INPUT);
delayMicroseconds(65);
r = !digitalRead(pin);
delayMicroseconds(490);
return r;
}Anyone used the LM35 analog sensors? They're only A$1.85ea at modtronix. Is 0.8 of a degree accuracy (at the extremes (0degC and 100degC)) good enough? I like the idea of being able to chain the DS1820s on a single bus, but I don't want to order three more and get three more duds.
edit: forgot to close a bracket
h34r: All 3 sensors are now returning data.
