The All-New MightyWatt revision 3 turns your Arduino Uno R3 or Arduino Zero (M0/M0 Pro) into an electronic load capable of dissipating 70 Watts in a very small form factor. Ideal for testing power supplies, batteries, solar cells, fuel cells or power amplifiers. MightyWatt R3 has a research-grade electronics and is aimed not only at hobbyists but also at professionals.
Ready to go
MightyWatt R3 comes fully assembled and calibrated. You will thus get everything you need except the Arduino. The calibration is independent on Arduino board.
How does it work
MightyWatt R3 uses a special FET in a linear mode to act as a variable resistor. User values are set via DAC that is controlled by Arduino. Current and voltage are measured using a built-in delta-sigma ADC and the load can switch between a constant-current or constant-voltage mode in hardware. In addition, constant-power and constant-resistance can be maintained via a software control loop.
Firmware, as an Arduino sketch, is provided. A Windows software (written in C#) is also available so you can control everything with a few mouse clicks. Everything is open-hardware and open-source and I am open to your questions :-)
Specifications and highlights
Optional acrylic case:
Optional test cables:
Optional booster pack (read the guide):
Firmware and software
MightyWatt R3 uses an Arduino sketch as its firmware. There is also a second sketch for calibration if you wish to recalibrate your unit manually. Windows software uses the virtual serial port of Arduino to send commands and receive data from the load. It can set constant current, voltage, power and resistance. Monitor temperature, log data and create scripts that include constant values and ramps. It also has a watchdog to disconnect the load in case value drops below or rises above a user-set threshold. You can switch between 2-terminal and 4-terminal measurement. The software features real-time statistics and you can display graphs using the built-in support for gnuplot. All the firmware and software is open-source and fully-functional right away but you are more than welcome to tinker with it!
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I am 31-year old and have a PhD in inorganic technology (specialized in electrochemistry). I create hardware that is often inspired by electrolysis and fuel cell research.