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See my drawing above I’ll try this and see what happens. The grounds are all common. Should I be running it with a heatsink? For simplicity I haven’t put the DS18B20 in there.

Because the heater is just stuck on the bench underneath the fermenter, with a little insulation around it, thermal transfer to the vessel is poor at this stage.

This is something I’m looking at improving, probably with an immersion heater, but the point I’m trying to make is that you need the heater at a much higher temperature than the desired fermentation temp.

You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, kill it and when it drops a bit turn it on it has enough thermal mass to keep things warm in between.

Here’s a snap transistod the sandbar: You say I need to be limiting the current from the base of the transistor and the Arduino pin. I can switch an LED on and off with this circuit not at 12V, obviously but when I try it with the sandbar it quickly goes up in smoke.


I’m rather confused by your drawing. I am now using a big E transistor not the datasheet for the exact part but a similar one as I thought I was putting too much power through the little transistors.

Is this too low to open the transistor gate sufficiently? You haven’t included a pull-down resistor so I take it you think I don’t need one at all.

For example, its now running off 6V and I’ve got it running straight off the power supply without an control. Transisotr problem is that I have burnt out two transistors one C and one H already and I don’t know why. Here’s pics of the Arduino and the setup. I have a flyback diode parallel to the resistor to disperse any back EMF the resistor coil generates and a pull-down resistor on the base of the transistor.

So as I still wanted a heater circuit and I am lazy I bought one of these. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

Unfortunately its too big to fit under the fermenter! I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. Why does it get this hot?

(PDF) H945 Datasheet download

The upshot of this is that switching of the heater, on or off, occurs trajsistor few minutes so it would still burn out. Thanks for the schematic.

My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch 9h45 transistor controlling power to the the resistor.


Also good to know I can do without the diode. I hope this should cover it. I thought resistance of transistors, especially larger ones like that, was negligible. The fermenter is covered by a black bag. At that kinda current I would start looking into mosfets to keep the heat down, after 1amp heat starts to get in the way with transistors.

After playing around with this for a while I gave up as the big transistor I was using had to be reallocated to another project which is working wonderfully, thanking you. At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them.

H NTE Equivalent NTEA TRANSISTOR NPN SILIC – Wholesale Electronics

Hi pwillard, thanks for your input too. Hi winner, thanks for your comment.

Am I doing something wrong? Mike has pointed out some issues and I see more. Any input will be most gratefully received.

I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. I might set the relay up again tomorrow.