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Interlock board

Arduino Leonardo (http://arduino.cc/en/Main/ArduinoBoardLeonardo)

Source code: serial.ino

Need micro-USB cable to reprogram. Software is already installed on Windows laptop.

Inputs:

• HTM2500LF temperature+humidity sensor inside Lexan box
• Flow switch in cooling system return line
• RS-232 connection to chiller - status, set T, measured pressure/flow/T

...

• RS-232 to chiller: if tripped, send "stop" command every 1 s
• Interlock to CAEN crate (5V normal, 0V tripped) - trip turns off all outputs immediately
• Prints inputs to USB serial connection every second (if plugged in)