Shared Projects

R 4x 1206 (SMD 1/4W 4,7K) SW1 Kodierschalter KMR 10 oder KDR 10 oder Jumper

This is a simple board meant to work as an adapter for hooking an aimtrak up inside a Namco arcade gun (so it can be used with a PC with functional recoil). The board fits into the handle of the gun and contains through-holes for each connection between the aimtrak, connections in, and the solenoid in the gun. The board also includes a diode for the solenoid along with a TIP102 + Resistor for triggering the solenoid. Not much else to say, the board could use a lot of improvements but it gets the job done.

A low battery indicator board that uses two transistors and a 10k trim potentiometer to set low battery voltage. When the battery voltage is high, Q2 is active, allowing current to flow through. The current flow brings the base voltage of Q1 to 0V, with Q1 subsequently not being active and the LED is not switched on. When the voltage on the base of Q2 is lower than 0.7V (given by the output of the voltage divider on R4) Q2 is off. The current flowing through R2 thus goes only into the base of Q1. Q1’s base is now at a voltage higher than 0.7V, which activates Q1 and turns on the LED, indicating a low battery voltage.

ESK-564-110203

Tyeensy 2.0 LED Matrix Display, MAX7219 ICs, 3mm 8 x 8 Led Lattice Bright Red Dot Matrix Module 8x8 8*8

https://github.com/i-petrovski/ledmatrix

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.