I apologize for the clutter but I have been making some adjustments to my brew stand but took some pics to night as requested.
My HERMS brew stand. I have Blichmann 20 gal MLT. HERMS vessel is a 2 gal igloo cooler with Copper Coil in it. I have temps sensors on the heat exchanger in and out and temp sensor in my MLT. The heat exchanger out is what my arduino PID controls the set point to. I only vary the output to the heating element. I don't control the output to the pump. BK is Keggle.
Here is my simple control box. Its not pretty but it works for me.
I got the box at home depot. I believe its 8 x 8 x 4.
The round plug on the left is for connecting my 3500 watt HERMS heating element.
The switch is to select to manually use the pump or control via the PC interface.
The regular electrical socket is used to power laptop and the air pump that mixes my HERM vessel.
The blue, yellow, orange wires are for the temp sensors.
I used mini XLR connectors to connect temp sensors to the control box
Temp sensors are DS18S20.
Here is the assembled temp sensor and thermowell.
Here is pic of my PC interface. Processing is on the left. The two graphs are plotted via LiveGraph and is updated real time from logged data file that processing writes from the the data it recieves from the arduino.
The top graph is the temp sensor for mash temp, heat exchanger in & out.
The lower graph is showing PWM of the HERMS element and state of the pump on or off.
I run all this on Ubuntu and use a script to start the processing sketch, and the two live graph windows so its just a double click of a icon when I start everything up.
Feel free to ask me any questions.