Shared Projects

USB Charger V2 using OnSemi lm2576 switching regulator. It will provide 5v 3amp output for charging I devices. There are resistor dividers for making the correct voltages on the d+ and d- . This layout is untested, but the schematic is fully tested and works well. There is one error on this board, it with the coil, it is layer out for an axial coil not the radial rl2444 that is on the silk. See v1 if you want to use the rl2444. I will update the description here with the correct coil when I get a chance. The correct coil should be coilcraft PCH-45X-683.

3a USB Charger 1x2amp 1x1amp

description: Autonomous 3 seven-segments display powered by an Atmega328P.

features: - small form factor - communication: Serial, I2C, SPI, (bitbanging possible if you want to) - SDM components, soldering by hand is not too difficult. - 5 volts only - Arduino IDE compatible - programmable via ISP by default (or maybe via serial lines with a different bootloader) - crystal 16Mhz, 20MHz (or whatever or internal if you want to) - 2 support holes for 3 mm screws

Main part list: 7-segments common cathode led display, ATmega328P, quartz 20MHz, resistors, capacitors.

==> See this Github for more info!

Arduino to 13 LED Drivers that can drive LEDvf*N-Vpwr>1V each

ATTiny85 Breakout v.9

Just a little board to work with the cheap SMD ATTiny 85.

ATTiny 85: http://www.digikey.com/product-search/en?pv7=2&k=ATTINY85-20SU-ND&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

You can use an Arduino as ISP: http://www.instructables.com/id/Program-an-ATtiny-with-Arduino/

NOTE: If you see the following it means you’ve programmed the ATtiny85 successfully:

“avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85”

It’s an error, but one you can ignore :)

LMX9838 breakout board

STM32F4 discovery injector drive board

Pan/Tilt/Dolly camera control for timelapse photography. Controls three Easydriver stepper motor drivers from an ATMega328. The camera is controlled via optocouplers. The circuit can also be used for a CNC router.

Simple breakout board for the Atmel 328P

Simple breakout board for AtTiny 85

[TESTED: WORKS] Very simple LM386 based single channel audio amp. Use R3 to adjust gain.

• IC1 = LM386
• C1 = C3 = 220uF
• C2 = 10uF
• R1 = R4 = 10ohm
• R2 = 1kohm
• R3 = 10k pot (Adafruit ID 356)
• Terminal Blocks (Adafruit ID 724)

Breakout board for the AD quad DAC

ST7920_INTERFACE_spi

Atlas Shield is a multiplexer board for Atlas Scientific embedded sensor circuits, designed as an Arduino-compatible shield. Design, documentation and firmware on GitHub.

This board requires a 74HC4052 serial/analog mux/demux chip in 16-pin DIP packaging. These used to be available from SparkFun, but have been discontinued. They can be purchased from Digi-Key (Digi-Key part number 568-1457-5-ND) for about $1.21 for quantities less than ten.

To attach the Atlas shield to an Arduino board, you’ll need some headers. Some options are :

• Adafruit’s Shield stacking headers for Arduino (R3 Compatible)
• Sparkfun’s Arduino Stackable Header Kit - R3
• If you don’t plan to stack another shield on top, you can use male header pins, like these

To attach your probes, you’ll need four 5mm pitch 2-pin terminals. Some options are :

• Sparkfun’s Screw Terminals 5mm Pitch (2-Pin)
• Pololu sells them in a four pack

You can either solder the Atlas sensor boards to the shield, or you can mount them in headers. If you want to use headers, you will need eight three pin female headers.

• You can buy a long row of headers and cut them down with wire cutters. This is cheap and functional, but ugly looking.
• Buy some pin headers (Digi-Key part number S7036-ND).

lz1 with power peg

ECU 64p connector board

Christmas Star Light for manger

Getting To Blinky from Contextual Electronics

Gate Close Indicator