We were recently working on a project where we really wanted to power a QT Py ESP32 from 12V – but the only power input on the board is basically USB 5V max. Never one to give up, we designed an add-on that will allow anyone to use a QT Py or Xiao dev board with up to 20V DC power!
In the center is an MPM3610 integrated buck converter, which will generate 5V from up to 20V input with cool DC/DC technology, so there’s no heat sink needed. The MPM3610 can give about 1 Amp output, which should be plenty even if you have LEDs, WiFi connectivity, displays, or even a small motor or servo.
The board features a 3.5mm terminal block and 2.1mm DC jack inputs, protected with a Schottky diode. You can use either to power the board, but don’t plug in different power inputs to both – they’re wired directly together on the BFF. If you’re using the DC jack to power, you can use the terminal block as a ‘pass-through output’ to connect other high-voltage devices.
There are two small enable and ground solderable pads next to the terminal block, so you can use an external switch to disable the converter.
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