Shared Projects

Remote soil moisture measurement https://github.com/ReiniervdL/Vinduino/blob/master/Vinduino-R_Wifi_V1.0.ino

Shifts I2S data for use with external filter mode on the PCM1794A

IoT RGB Lamp - https://github.com/myk3y/familamp

High speed optocoupler isolator for 3V serial port.

• 2 x Avago ACPL-M21L-SO5 optocoupler
• 4 x 470R
• 2 x 100nF

Easily runs at 1 Mbps, 2 mA LED current at 3.3V, 1 mA logic current from 3.3V

Micro add-on board for the MPU9250 9 DoF motion sensor and MS5637 altimeter to be mounted on the smd pads on the back of the Teensy 3.1. First attempt at a four layer board.

Buffer board for a Cypress FX2 EZ-USB dev board, can be used with Sigrok as a logic analyzer. https://github.com/ExplodingLemur/ezusb-logicanalyzer http://blog.explodinglemur.org/?p=37

Tube Socket Board

Simple circuit using LCM555 timer for clock to operate SN54LV163A binary 1 - 7 counter which drives FFB3904 dual mosfets that control two rgb LEDs which, lastly, cause the owl’s eyes to glow with continuously varying color. Intended as a wearable pendant for little girls and daring men. Added SMD switch for power on/off. Added rechargeable 3V, 3.4 mAH coin cell Li-ion battery and charging circuit. Removed through-hole JST connector. Added top hole for keychain.

Power a breadboard with a wall wart.

2.1mm Power Jack (TaydaElectronics.com, Part# A-4118) Double row pin header (Tayda, Part# A-198) 2 position screw terminal (Mouser.com, Part# 538-39880-0302). The screw terminal can also be had cheaper at Tayda, but I wanted it in black to match the 2.1mm jack.

Those 9 volt snaps always seem to have stranded wire leads, making them hard to plug into a breadboard. Tinning the leads can make them too thick to fit.. With this you can just plug the 9 volt snap leads into the screw terminal and call it a day. Or just plug a wall wart into the 2.1mm jack instead.

NOTE: Although you see holes, the 2.1mm jack holes are actually slots, so they work with normal “solder lug” style jack slots when fabricated (notice the rectangular outlines there). You do NOT need a jack with PCB pins.

Optical Quadrature Encoder. Input voltage can be from 5V to 12V. Output voltage can be 5V or 3.3V

See https://hackaday.io/project/5631-charles-jr

Kilobot Overhead Controller for Arduino (Pro Mini, Pro Micro, Nano)

Wulf Breakout Board for Power and Data

V02

Clock generator

ST Microelectronic’s ultra-low-power real time clock coupled with Bosch’s BME280 pressure, humidity, and temperature sensor and ST’s M2402DFC 2Mbit EEPROM in an appallingly small add-on board for Teensy 3.1. Power is supplied via digital write to general GPIO pins since the total power requirement never exceeds 2 mA. Communication is via I2C and there are 4K7 pullup resistors on board. The temperature sensor allows the Teensy 3.1 microcontroller to make periodic calibration updates to the RTC calibration register so the clock remains temperature compensated for maximum (~2 ppm or 1 minute a year) accuracy. The clock outputs the usual date, days, hours, minutes, etc. but also outputs tenths of seconds as well as hundredths of a second.The on-board EEPROM is useful for data logging and storing alarm patterns (music) for output to a small speaker. With 2 Mbits (256 kBytes), lots of data can be logged and dozens of alarm sounds can be stored; one for every occasion! Added Taiyo Yuden PAS3225 2.6V 14 mF super capacitor and Comchip low forward voltage Schottky diode to provide power to the RTC time keeper even when disconnected from the microcontroller. The PAS3225 5 microAhour super cap can run the RTC (which needs ~330 nA at 2.6 V) for about 18 hours. The board is now a tiny weather logging station: pressure, temperature, and humidity can be logged once per minute for 15 days! Changed IRQ so pullup voltage provided on RTC side of the diode.