Our team encountered a challenge when attempting to power the QT Py ESP32 from 12V, as the board's only available input is limited to 5V from USB. However, we persisted and created an add-on that enables users to utilize a QT Py or Xiao dev board with up to 20V DC power.
The MPM3610 integrated buck converter, located at the center, utilizes DC/DC technology to convert up to 20V input to a steady 5V output without the need for a heat-sink. With an output of approximately 1 Amp, this converter can power various components such as LEDs, WiFi connectivity, displays, and even a small motor or servo.
This board has 3.5mm terminal block and 2.1mm DC jack inputs, each protected by a Schottky diode. While either input can power the board, do not use both simultaneously as they are directly connected on the BFF. The terminal block can also function as a 'pass through output' for connecting high-voltage devices when the DC jack is used for power.
There's two small enable and an ground solderable pads next to the terminal block so you can use an external switch to disable the converter.
Since its a bulky add-on with through hole components, compared to most of our other BFF boards, we think it's best to use socket header to plug a QT Py on top, rather than trying to have it solder back-to-back. For that reason we include two 7-pin socket headers. Solder them so that the QT Py sits on the top, there's two break-apart railings that can be used to bolt the board since plugging in a jack requires mechanical stabilization.
Technical Details
Product Dimensions: 30.4mm x 26.6mm x 12.6mm / 1.2" x 1.0" x 0.5"
Product Weight: 4.9g / 0.2oz
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