Shared Projects

3PDT Breakout with Adjustable LED brightness

Added A0 solder jumper to TCA9548A I2C multiplexer board.

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! IRQ pullup on the host side.

sensor

simple atxmega32e5 board

Carrier board for Speeduino VR socket, for two input modules

A simple analog-friendly STM32F030F4P6 breakout with UART and SWD headers

Another breakout board I used to test my MSGEQ7 based spectrum analyzer

This is a simple breakout board for two Lumberg KLRB4 3.5mm audio jacks. I get those jacks from Reichelt Electronics in Germany.

I used them to breadboard my MSGEQ7 based spectrum analyzer

Eagle files:

https://github.com/alohr/klbr4breakout

This is a PCB I designed for the Insanity Box dist pedal designed by Aron Nelson and Jack Orman.

Parts List: http://midvinterblot.com/InsanityBOM.htm

Original work found here: http://www.aronnelson.com/gallery/main.php/v/digi2t/veros/Insanity+Box/insanity.gif.html?g2_imageViewsIndex=1

Single Channel VR Conditioner for Speeduino

FET + 7135 BETA Version

Passive phono to ¼" stereo and ¼" TRS

I needed a way to ground my turntable when connecting directly to a high-end, balanced digital audio computer interface, but I did not want to design an expensive metal case. So, I found the Pyle PP444 product for $15 and designed this PCB to fit the existing holes and mounting screws.

You can convert the dual RCA phono inputs to both a stereo ¼" headphone jack and a pair of balanced ¼" TRS jacks for stereo audio. There are various grounding options available by installing jumpers.

The power input and LED are not actually used, but you could hook them up if you like.

V0.0.3

Test board for nRF51822 CFAC.

The Esp-13Flat-01 Adaptor is Protoboard friendly, and/or will fit on a 18 Pin DIP. To provide maximum flexibility, RAW pins connection are implemented.

Search: “Esp” on http://wa0uwh.blogspot.com

More info: http://budgetlightforum.com/node/37851