variable resistance
I am working on a temperature project I have got a 1.5k ohm resistor between these two wires which go to a heather unit and the heather goes full blast, I would like to control the resistance between these two wires from 100 ohms to about 1500 ohms what's the best possible way? At 100 ohms between the wires the heather goes really slow and at 1500 ohms it's at full speed. I've got the picaxe reading a temp sensor so with a desired value I could have the picaxe maintain the correct temperature with increaseing and decreaseing the value of the resistance between these two wires.
Thanks for your responds, Toby
Thanks for your responds, Toby
Comments
let me know, if your using ac, you could use a triac to control the voltage, dc you could use a mosfet with pwm , or use a digital pot to control a triac or mostfet, using a 555 circuit to adjust pwm. depending on the heater, if you use a digital pot directly it may overload or backfeed into the stamp if your using ac. sometimes you can take ac and use dc to simplify the process, but you could experiement if you can take the heater control apart.
Firstly,·this is a Basic Stamp forums. Maybe this post should be moved to the Sandbox. We won't be able to help with interfacing your circuit to a Picaxe.
Secondly, we need more detail. What kind of heater? What voltage is it running at and is it AC or DC? How much current does the heater draw? Does the power to the heater run through the resistor, or is it some kind of control circuit? Answer those and we might be able to help.
Jonathan
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Thanks toby