Shared Projects

This is a compact 3-Digit 7-Segment LED Display board, which uses the 5631BH Common Anode LED Display with the Titan Micro TM1637 LED Driver Chip. It is very similar to the many off-the-shelf variations, but is slightly more compact in that it has 3-Digits instead of 4-Digits, as most of-the-shelf versions are, and is thus targeted for applications needing only 3-Digits.

If board overhang isn’t an issue with the mounting technique, the 5631BH can be swapped for a 5641BH 4-Digit Display, as the 4th common anode lead is wired to the TM1637 Driver.

Also, all traces were intentionally left out of the end-plates so that they could be trimmed, if desired, to fit in an even more compact area that doesn’t require the #2 sized mounting holes.

SMD passives are 0805 size.

Schematic, gerbers, and bill-of-materials for this board can be found on GitHub as a sub-part of the Altura-MIDI-Theremin Remix Project, as this board was originally built to use with that project.

Board for http://github.com/hzeller/digi-spherometer Attiny85 reads output from a digital dial indicator, and outputs calculated sphere-radius on I²C-connected 1.3" OLED display (SH1106)

Breakout for either the ICS41350 (high-performance) or ICS41352 (ultrasound) PDM microphone for use with STM32L4. Both digital mics extend into the ultrasound, to 40 kHz for the ICS41350 and to 85 kHz for the ICS41352.

Audio Visual board for RedHat Summit 2019. More details to come

More details at github

Single mount for programmable tri color LED with servo plug input. For use with CC3D Flight controller.

A board to test LEDs.

Audio, PTT, CW, and FSK interface between a serial port and a TS-940S rig. Should also work for TS-930S and other rigs that use the same connections.

Smartstick REV5, with extra analog pin

• Widens “tail” by 1mm in each direction (wider by 2mm total)
• Uses AGND for battery monitor circuit (bugfix)
• Connects STBC08 PWR pin to teensy digital pin 23 (feature)
• Adds connection to A10 analog pin for battery monitor circuit

This board is an add-on to an Ettus B200mini or B205mini to output a PTT signal over a RCA connector.

2019 Micromouse produced by Kyle Semelka and Jerry Lee

Prototype rain sensor replacement

A mic preamp that makes piezo disc contact mics sound better. It uses the plastic tallboy ¼" TRS jacks available at All Electronics, with the SMD components beneath the jacks.

https://github.com/rahji/micpreamp

new pinout; improved silkscreen; fixed backwards rj45s

The latest board can be found here.

A PM2.5, PM10, Humidity, Temperature, TVOC and C02 sensor.

Check out the full writeup here.

Get them here.

Inconspicuous USB powered noise-maker. Uses a basic 555 timer circuit to beep periodically.

Parts list:
U1: 555 chip, SOIC package
USB: Male, type A, USB connector
B1: 5v buzzer (12mmØ) - Make sure to find one with an “internal drive”, this means that it will make its own sound signal
For 330 seconds between 0.33 second beeps:
C1: 47μF ceramic capacitor, 1206 package
R1: 10kΩ resistor, 0805 package
R2: 10MΩ resistor, 0402 package

http://www.blog.exrockets.com/blog/simple-diy-pic-micro-data-logger-with-sd-card-and-4ch-12b-adc/