Shared Projects

Mini SAM D51-017

Mini SAM D51 is a LEGO® minifigure-sized development board based on the Microchip SAMD51G 48-Pin 32-Bit ARM® Cortex®-M4F MCU running at 120Mhz. If you are familiar with some other of my minifigure-sized boards, you’ll notice I managed to create this one in a 2-layer format, which saves us money.

Please note that Rev 17 includes a PLCC-2 Reverse Gullwing LED on the back.

On-board Features

I/O

The board includes a usb-micro interface for programming and power. Rev 017 includes 0.050" spaced i/o along the edges that include castellated pins. I’m still experimenting with this layout, so it may or may not stay this way. I plan on having a “breakout” board to 0.100" breadboard-spaced pins. Maybe other add-on boards too.

Mini SAM D51 includes two LED indicators; a standard Arduino “Built-In” LED and an APA102 RGB LED - useful for CircuitPython - and available for programming in Arduino as well. There are two built-in buttons as well; a RESET button and a user programmable BUTTON.

Memory

In order to support CircuitPython, a 2MB Quad-SPI flash memory chip is included. This provides plenty of space for the CircuitPython program as well as space for user programming.

Other

The board includes a 500mA 3.3V regulator, more than enough to power this little board and its built-in features. The micro-USB circuitry includes optional provisioning for case grounding and ESD protection. Finally, The AREF input and recommended Analog and Digital power separation is present on the board.

BOM

BOM

CircuitPython

CircuitPython Board Files

Bootloader available by building the UF2 for mini_sam_m4 from this repository: Uf2 Bootloader

Open Source

Please check my Github for the latest design files and bootloade/firmware. More details can be found on Github

3rd and final revision of my Nixie Breakout Board.

With active termination and ATTiny system controller

First test EFR32 board.

prototype Arduino nano based TNC, based on design by Mobilinkd

Parts list:

* Optional for added protection against noise and transients.

Visit ledmaker.org for more information.

West Bridgewater Public library soldering badge. I usually build these with slow flash 5mm leds, BK-913 battery holder from digikey. The ¾" pinback is soldered onto the set of 3 pads on the back.

Can be used for ST7789 or ST7735 LCDs. (maybe others as well) 0.7mm Pin Pitch

ST7789 LCD Brakeout Board 0.7mm Pin Pitch

PIC16 8PIN 14PIN Breakout Board with PICkit Connector and optional IR Reciver.

ESP8266_MPU9250 werarable sensor prototype

Audio Amplifier

Base station Documentation

Base board for open-source AU/SweetSense air quality lamp (CEAQL)

PowerPMAC serial console adapter. BOM: Sullins SHF11-PBPC-D05-ST-BK (S9194-ND), Molex 0438600001 (‎WM5432-ND‎)

Board for an Arduino Controlled Useless Box

SiPM bias voltage regulator and current monitor test circuit.

A test board for a precision positive 0 to 70 V regulator with ~800 uA output current limit and 0-400 uA output current monitoring. Expect noise <200 uV rms and <5 Ohm DC and <100 Ohm AC output impedance.