I went ahead and double checked all my connections for my hand wiring on the underside of the board with my multimeter. I got a bunch of beeps which is good news. I went ahead and used jumpers to connect to the 4 pins I'm using on the Raspberry Pi at this time. There may be more parameters I end up measuring later. The temperature sensor hooked up to the three pin terminal. All the "high power" electronics including the fans and Peltier are wired into one terminal since they are all the same operating voltage and it just draws more current. They are hooked in parallel to be precise. I did use larger wire when wiring these lines because there was going to be more than 5A running through these. After I wired everything it up, I powered it through another screw terminal and the board, sensors and fan all functioned properly. The RasPi didn't do anything odd because I powered through a convertor and had no issues controlling the MOSFET. I tried to power it simply from a 12V to 5V convertor only with some capacitors wired in but the Pi didn't function properly.
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| Peltier Wired Up |
In the program, a temperature range is set where you'd like to ferment. The Peltier turns off and on based on that temperature reading. I want to make it a little more intelligent when it comes turning off and on. I don't want it to run continually simply because it doesn't have to.
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| Wired Setup |
I am pretty pleased with how it is coming together. Before I go ahead and build the chamber, I think i may do a test just in a cardboard box to see how cool it gets with one device. I'd figure out the losses and predict the temperature but I do that in my day job so I'll wing this one.
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