Shared Projects

pickit3 to rj12 adapter

Recommended right angle header: Digi-Key 3M9471-ND

Recommended vertical RJ12 connector: Digi-Key WM3789CT-ND

Controls a “standard” LCD over I2C.

Designed to be attached to the back of the LCD, either monochrome or RGB, component side /facing/ the back of the LCD. This leaves the back almost entirely bare, so less worry about shorts and whatnot when mounting. (I should make a version that uses SMT connectors to the LCD.)

Attiny84-based, with AVR ISP broken out as a non-standard 6-pin connector. The layout was choosen to take advantage of the fact that SPI and I2C use the same pins on Attiny84’s, meaning only one connector is needed for both programming and field use.

For more schematics, non-working firmware, and potentially help, see the github repo.

Courtesy TI PMP-9531

ForkinBrain - 18 Channel Xmega model

Temperature transmitter with 12f683 and 3 DS18B20 sensors. Includes programming header

Power Distribution Board for Scoregasm

A quick and dirty breakout board for testing the MAX16820 buck IC.

• 0805 components
• See datasheet for all other needed information.

parallax propeller and serial communication

Constant current,constant voltage lab power supply featuing the LT3080

Breakout board with two independently addressable ST Microelectronics' 2 Mbit (256 kbyte) M24M02-DRC I2C EEPROMs designed to be mounted onto the Teensy 3.1 and use digitalWrite for power and ground due to the very low-power (< 2 mA per EEPROM) requirements. Can also be used as a traditional breakout board since VIN ranges from 1.8 to 5.5 V. Cutting one or both traces between the solder jumpers enables write protect mode allowing access to the data already written but disallowing further write operations. The write protect is reversible by simply soldering the junction again. Operating temperature range is -40 C to +85 C making this an ideal solution for portable/remote data logging when power and space are at a premium. EEPROM write operational for 4 million write cycles and data is retained for 200 years! Minimized width to make it even more appallingly small!

ST Microelectronic’s ultra-low-power real time clock coupled with Measurement Specialties MS5637 pressure and temperature sensor and ST’s M24512DFM 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 512 kbits (64 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 1N4148 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 15 hours.

with PT4115

with 6n137

A new version of my successful UVLO circuit. This one has pushbutton power off in addition to the on that the previous had. It still uses an Atmega85, and the firmware for that chip is still important to the proper functioning. Ping me if you want it.

Screw terminals (TE 282834-5) to R/A male header (Molex 22-28-8050) for use with Microchip’s PICkit In-Circuit Debuggers.

5W VALVE GUITAR AMP

GEETAR DISTORTION STOMP BOX

I2C RTC Module V1