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With the SSR you linked, yes the heat will stay in the box but in that case you can probably get away with just puting in a fan blowing on the SSR's and a vent on the other side of the case or some other configuration that exhchanges air with the outside and has cool air flowing across the SSR...

This isn't exactly altering phase angle, it's merely a device that allows you to tune control frequency inline with your source frequency. With a basic PID controller, it's PWM output is coming out as a square wave signal and most likely at a different frequency and phase than normal AC power...

very nice looking! :rockin:

I've been thinking about fancy ways to do the fridge thing with PID. My current thoughts are to toss temp data into an array that covers a fixed time period (say 5 minutes with samples every 30s) and run a moving window on it for stats, and calculate my own I and D terms off that. Then for...

exactly, I'm planing on starting out just the arduino running a single element at a time and uploading new code each time I need to change a setpoint. GUI and runtime changes in setpoints will come later after I have some batches under my belt.

Still getting started myself, but yes that will work... but see other comments below First, since this is a DYI job, look into getting a 50A GFI breaker to place in front or just after your wall receptacle as a safety and overall damage precaution. It'll kill your circut if any hot line...

Just caught this thread and wanted to chime in. I haven't yet messed with it but I did find this in line 26 the PID_v1.cpp file of the PID library SampleTime = 100; //default Controller Sample Time is 0.1 seconds Since for heating large volumes of water there is massively small changes in...

here's the arduino PID library if you want to play around with it. It's actually rather user friendly only hard part really comes in when deciding on the control constants, but that it kinda fun to play around with. http://arduino.cc/playground/Code/PIDLibrary Edit: Oh and a thread on using...

Right now I'm using Processing, which is a Java based graphical programing language, to graph out my data. There's also a good controls library called CP5 for it that abstracts away some of the micromangement of coding in buttons and i/o fields. For me, I'm planing on either messing with...

Atempting to do something very similar myself. I have kettles all ready but waiting to gather some more funds and time to do electrical work. I'm developing diagrams for everything right now too so I will gladly share anything as I get it all going. As for displays, I went with a 20x4...

There are a couple of easy ways to do this. Easiest would be to emulate a thermostat. Using IF statements you can place bounds on your read temperature and then turn wires on and off using digitalWrite(). so you would end up with something like \\do something to setup temperature probes...

these kinda things are normally used in industrial settings as a centralized steam supply starts being very cost effective and heat efficient at higher heating loads. Steam is also easily reused for multiple heating steps by altering steam pressure and pressure of the substance to be heated...

as long as the hot water source you are using is hotter than the water you are trying to heat it should work just fine. I'm assuming you aren't just filling your HLT with hot water as you are worried about minerals from your water heater. Personally I have a tank-less water heater and plan on...