What is it?

ZonCoffee is an Arduino-compatible PID controller board. It has a variety of uses, from an espresso machine PID controller to a reflow oven controller. Note: Although some older purple boards are pictured above, the board(s) you receive will be awesome-looking white with black screw terminals.

Caveats

I built up a few of these boards which I have lying around, so I thought I might as well sell them! The price for these is just a bit above what the parts and PCB cost me (not to mention hand-assembly time), so I'm really not making any profit. Hopefully one of these boards will be useful for you!

Since I haven't actually sold these boards before, the firmware has not been extensively tested. Expect "alpha" level functionality, as you may experience some bugs that have not shown up in the wild. However, the firmware (and hardware!) is entirely open-source and Arduino-compatible. This means you can easily modify the code (or write your own) for whatever application you can think of!

The Technical Details

The ZonCoffee provides an ATMEGA32u4 microcontroller with USB and the Arduino Leonardo bootloader along with a MAX6675 thermocouple-to-digital converter IC. The ZonCoffee board ships with the default espresso machine controller firmware pre-installed, which can be controlled over USB (as a virtual serial port) or with an LCD and rotary encoder. This board does not include onboard drive circuitry. Instead, it allows the connection of an external solid-state relay which may be sized to fit the application.

Supported Accessories

• Rotary encoder with pushbutton
• Parallel interface LCD
• SparkFun serial LCD
• Piezo element for audio feedback
• Solid-state relay (5v logic level output)
• Mini-USB power input (power with a USB cell charger or PC)
• Auxiliary power input (power with a 5v wall adapter or other 5v source)

Questions

If you have any questions, feel free to ask them below! I'm glad to help.