CCR 24V PSU revision 2

Arduino Mega Shield

Adam and Oscar updated version

TCA954A i2c Multiplexer breakout board with 4-pin molex connectors

Detect and Alarm Water Leaks and Display Temperature and Humidiy

I/O Expander

The Monolith Synth Project needed to use a large number of these LED lit arcade buttons.

Dimming of the LEDs was required. Initially I considered using this Adafruit 16 Channel PWM board. But the LEDs in these buttons have integrated resistors which require 12 volts, so 16 transistor circuits and another board for reading the switches would have also been needed.

Instead I designed this board with everything required on a single small size board.

It uses the same PCA9685 chip for 12 bit PWM control on every LED, with mosfet drivers to handle 12V outputs, and also a MCP23017 chip to read the buttons. Every button has a discrete 1K pullup resistor (rather than using the higher impedance on-chip pullups) to help with use in the same cable bundles cross coupling to 12V PWM signals.

Parts Placement

Bill Of Materials

 1   MCP23017 16 bit GPIO                   MCP23017-E/SS-ND
 1   PCA9685 16 channel PWM                 568-11925-1-ND
 1   LP2950-5V LDO Voltage Regulator        296-20933-1-ND
 1   CAT811T Reset Chip                     CAT811TTBI-GT3OSTR-ND
16   FDV303N N-Ch Mosfet                    FDV303NCT-ND
 4   Header, 16x1                           609-3256-ND
 1   Header, 3x2                            67996-206HLF
 2   Connector, Molex 3 pin                 WM4201-ND
 1   Connector, Terminal Block 2 pin        277-1150-ND
 2   Capacitor, 0.1uF, 805                  478-1395-1-ND
 1   Capacitor, 4.7uF, 805                  490-6479-1-ND
 1   Capacitor, 100uF (10-47uF is ok)       399-6648-1-ND
16   Resistor, 1K, 603                      311-1.00KHRCT-ND
 3   Resistor, 10K, 603                     311-10.0KHRCT-ND

Mating Connectors

16   Housing, 4 position                    952-2229-ND
64   Crimp contact                          952-2158-ND
 1   Terminal Block, 2 position             277-1011-ND
 2   Housing, Molex 3 position              WM2001-ND
 6   Cript contact                          WM1114-ND

How to use Digikey’s website to find alternate parts when any of these aren’t in stock.

Monolith Synth

Four of these boards where used in the Monolith Synth project, shown at Tested and Bay Area Maker Faire 2017.

nRF51 based xBridge

GSR meter piggy back board for Pi3

https://www.youtube.com/watch?v=FhUR74WrZe0

Shield for bootloading an ATmega328

Analog to Toslink

170510

you lazy breadboarder!

TCRT1000 IR Reflectance Sensor Board for sensing button presses

Throwing Star LAN Tap

throwingstar

2 layer board of 1.99x1.99 inches (50.50x50.50 mm). $19.75 for 3

Opensource, you will have to source all the components yourself (part numbers and construction howto is in the link above), this is under the GNU GENERAL PUBLIC LICENSE Version 2

Best suggestion is to buy his kit…so he can continue to develop awesome open source hardware we all can use

Small board for making a CE header breakout for the Teensy 3.2

ISA Bus Terminator, Active w/ LT1118 or LT1086

This board is a JTAG adapter based on an FTDI chip in a SD-card form factor.

Design has been tested with openocd and an Atmel SAMD5 board successfully. ***Note: This board does not properly specify the CC resistor for the USB Port, resulting in it not being detected properly with a usb-c to usb-c cable. A usb-c to USB-A cable works fine, however.