Control 2 identical bed heaters on one temperature sensor
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I have a print surface which in hindsight, I should have put more though into the location of the bed heater. As such, I am considering using 2 smaller PCB heaters to heat the print surface in place of one large silicone one. I'm considering this due to price and availability.
Can I use 2 bed heaters on the same output and either put the temperature sensor in the Aluminum bed itself, or only use one of the beds built in temp sensors, and ignore the other one.
Any input? I'm still in the brainstorm phase so nothing is totally set in stone. I just want to consider all of my options.
Thanks all
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@mklein23 said in Control 2 identical bed heaters on one temperature sensor:
Can I use 2 bed heaters on the same output and either put the temperature sensor in the Aluminum bed itself, or only use one of the beds built in temp sensors, and ignore the other one.
Yes, you can do either, subject to total current draw from the Duet bed heater output being no more than 18A. Or you can use both thermistors connected in parallel, and in the M305 P0 command use R50000 instead of R100000, assuming they are 100K thermistors.
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@dc42 said in Control 2 identical bed heaters on one temperature sensor:
M305 P0 command use R50000 instead of R100000, assuming they are 100K thermistors.
Will doing this take the "average" of the 2 readings from the sensors?
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@mklein23 said in Control 2 identical bed heaters on one temperature sensor:
@dc42 said in Control 2 identical bed heaters on one temperature sensor:
M305 P0 command use R50000 instead of R100000, assuming they are 100K thermistors.
Will doing this take the "average" of the 2 readings from the sensors?
Yes when the temperature difference is small, but a bias towards the hotter one if they are at significantly different temperatures.