Shared Projects

Modification of AirPi v1.4 correcting pull-up resistor on DHT22 sensor http://airpi.es/

A breakout board for a rotary encoder with pullups for both data lines. The board breaks out the following:

• VCC: connect to a 5V source
• A: the ‘A’ data line from the encoder. Connect to an input pin
• B: the ‘B’ data line from the encoder. Connect to an input pin
• GND: ground

The footprint for the two resistors is SMD 0805.

The board is compatible with:

• Bourns PEC12R
• Alps EC12
• Sparkfun rotary encoder, COM-09117

The footprint of these encoders is common, so the chances are that your encoder will also fit this size. Just compare the datasheet of your encoder and one of the encoders listed above.

VESC capacitor mounting board for 12.5mm capacitors and up to 10AWG wire

Motorcycle Relay Replacement intended to drive LED lighting. Board is designed with Kicad. Check Github for the KiCad design files and code.

Sixteen-key matrix keypad of TL3342-like switches.

You could make a keypad in your sleep. It is not difficult. The real problem is, you will be asleep by the time it is finished, because wiring one up manually is dull and repetitive. You could save yourself a lot of time and buy a keypad from Adafruit or Sparkfun; it would be cheaper and better. But what if, for some strange reason, you still want a keypad that calls for an exercise in reflow soldering? Fine, here you go.

You will need sixteen TL3342 (or equivalent) pushbutton switches, some good (not bad) solder paste, solder paste stencil, and a reflow setup of some sort. The gerber file for the stencil is included in the archive (file name is “keypad4x4-F.Paste.gbr”) and you can order it from OSH Stencils (they do not have a sharing feature at this time, unfortunately.) You could solder the pushbutton switches with a soldering iron, too, but it would be nearly as boring as wiring it up manually. If you intend to plug it into a breadboard, you will also need an eight-pin, 2.54mm-pitch, one-row header.

Pushing those tiny buttons with your fingers can be a pain, which is why I created this enclosure: Keypad, 4x4, Enclosure You will need some 3/8" #4-40 screws and a bunch of washers to assemble it together.

Designed with KiCAD Version 4.0.6.

The 4chord USB MIDI Keyboard in Piano shape. Play all them major hit pop songs with a simple press of four buttons.

Built around an ATmega328P with a Nokia 5110 LCD and the V-USB library, 4chord MIDI acts like any other, regular MIDI instrument.

• Hackaday.io project page
• Github repository
• Project website
• Official website

PCB was designed with KiCad and released under the CERN Open Hardware Licence version 1.2.

18x35 test

Flex adapter

Continued evolution, removed battery voltage divider on A4, moved indicator led from D13 to A4, removed power-on led, put BME280 on back with CCS811 so VEML6040 can measure direct sun without causing the air quality sensors to go nuts, tightened trace tolerances..

DieBie JTAG 12s BMS