JerryKnight
Home thermometer network graph
I recently added a 1-wire thermometer network, using the 1-wire USB adapter (DS9490R), temperature sensors (DS18S20), speaker wire, and audio plugs, jacks, and splitters.
A smaller version of this graph is shown on my Insteon thermostat web control page.
The temperature sensors seem to be very accurate (well, precise, at least). They're digital, so no calibration required (they are factory calibrated, I assume). And with 1-wire technology, you can string lots of them on one common data line (and ground, so it's actually a 2-wire system, but who's counting).
The sensor for the blue graph is run up inside one of the A/C vents, so I can get a direct indication of the A/C output. As you can see, it does about 1-2 cycles per hour. (I bumped the thermostat up from 78 to 80 around 10am.)
The outside sensor is hanging out the window by my computer, in the shade of the bushes and the big tree out front, so I don't think direct sunlight is affecting it much in the afternoons.
Oh, and this image is from a custom-made graphing page from the temperature logs using PHP and GD. Temperature logging is done by digitemp every 15 seconds.
Home thermometer network graph
I recently added a 1-wire thermometer network, using the 1-wire USB adapter (DS9490R), temperature sensors (DS18S20), speaker wire, and audio plugs, jacks, and splitters.
A smaller version of this graph is shown on my Insteon thermostat web control page.
The temperature sensors seem to be very accurate (well, precise, at least). They're digital, so no calibration required (they are factory calibrated, I assume). And with 1-wire technology, you can string lots of them on one common data line (and ground, so it's actually a 2-wire system, but who's counting).
The sensor for the blue graph is run up inside one of the A/C vents, so I can get a direct indication of the A/C output. As you can see, it does about 1-2 cycles per hour. (I bumped the thermostat up from 78 to 80 around 10am.)
The outside sensor is hanging out the window by my computer, in the shade of the bushes and the big tree out front, so I don't think direct sunlight is affecting it much in the afternoons.
Oh, and this image is from a custom-made graphing page from the temperature logs using PHP and GD. Temperature logging is done by digitemp every 15 seconds.