> I'm kicking around the idea of controlling an ordinary 120 VAC
> incandescent light (actually a 150W heater).
>
> I'd like to control the heater based on the temperature of the surface
> beneath it. I need to control it to approximately 105 deg F (more or
> less; great accuracy is not needed here.)
>
> I've found some basic PIC circuits on the web but I wonder if anyone
> here has any suggestions, both for the temp probe and for the heater
> control.
>
> As this will most likely be a one-off, an inexpensive commercial
> solution would be fine.
>
You would need:
1. Zero Crossing input
2. DC Power circuit
3. PWM / Triac Control
4. Load current protect circuit
5. temp measurement - A/D
6. Control interface - RS485/CAN/RS232
The NXP LPC2xxx is a good fit for this.
How many channels do you need?
How far from the controlling device do dimmer channels need to be located?
Joel Winarske
Independent Electronics, Inc. / Smart e-Works LLC
www.indyelectronics.com
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