Light-Up Poker Chip

Exciting project by Alex Wulff on

Screenshot from 2017-06-17 13-18-03.png

Light-Up Poker Chip

This whole circuit is the same size as a regular poker chip, but with an added surprise: lights!

Spice up your poker games with these cool blinking chips. They can be programmed on the fly to have a certain number of the LEDs illuminated to indicate value, or you can have the lights blink in a cool pattern. They make great playing chips for championships or great prizes to hand out to the winners.

Video of the board in action:

AlexWulff has shared the board on OSH Park:

Light Up Poker Chip Rev. 1


Order from OSH Park

Light-Up Poker Chip


Jeremy g. designed a mashup between an Arduino Uno and a Xilinx 9536XL CPLD:



The XCACDV3, CPLDuino is a single board solution to meld Atmels ATmega 328 RISC microcontroller with a Xilinx XC9536XL1 CPLD. Allowing for rapid prototyping of digital circuits without the need for a breadboard. The CPLDuino is capable of passing information from the on board ATMega328 to the CPLD and vice versa, allowing for real-time data monitoring. Thanks to the on-board CP2102 USB to Serial UART, data can be viewed and manipulated via the virtual com port.




Tindie Seller Interview: Jakub Polonský and His “MightyWatt” Load


Jakub Polonský and His “MightyWatt” Load

There are people of diverse backgrounds selling on Tindie, but as far as I know, Jakub Polonský is the only one here with a PhD in electrochemistry. Though this gave him a good background in testing of electronic quantities for electrochemical systems, as far as designing electronics, he’s self taught. He graduated in 2012, but started with Arduino boards in 2010, allowing him to use this versatile tool for research purposes.

Check out our previous blog post for more information on the project:

The MightyWatt: a 70W Electronic Load Kit


Tindie Seller Interview: Jakub Polonský and His “MightyWatt” Load

Teensy: TDM Support For Many-Channel Audio I/O


Paul Stoffregen posted an update in his Teensy Audio Library on

TDM Support, For Many-Channel Audio I/O

Some projects need a lot of audio I/O. Maybe you’re doing positional audio sound effects (using the 8-tap delay effect) where ordinary stereo or even 5 channel “surround” isn’t enough? Maybe you’re making the ultimate Eurorack synthesizer module? Or you just want a lot of signals, because you can!

Here’s a board for the Cirrus Logic CS42448 chip, which provides 6 inputs and 8 outputs. All are high quality audio, and all work simultaneously.

PaulStoffregen has shared the board on OSH Park:

CS42448 Audio, 6 Inputs, 8 Outputs


Order from OSH Park

Teensy: TDM Support For Many-Channel Audio I/O

EEPROM Programmer Arduino Shield

From the The Oddbloke Geek Blog, an EEPROM programmer shield designed for Arduino Mega:


Simple EEPROM Programmer … revisited

Some time ago, I wrote about my DIY EEPROM programmer driven by an Arduino Mega. It’s a very simple, low-tech project … but has attracted a consistently-high number of visitors to the site and is something I use several times a week.

EEPROM Programmer Arduino Shield

Using Si7006 to read temperature and humidity

From the bitknitting blog:


Using the Si7006 to get temperature and humidity readings

I made a PCB with the Si7006 on it. This post is my bumblings encountered as I successfully got temperature and humidity readings from a Si7006 using the PCB I designed. In summary, the Si7006 is easy to work with. It is relatively easy to solder and very easy to access via I2C […]


The design files and source code are available on GitHub:



Using Si7006 to read temperature and humidity

E-Paper Breakout Board for Teensy

Breakout board designed in KiCad to connect Pervasive Displays 2.15″ E-Paper (E2215CS062) to Teensy 3.2 or Teensy LC. Based Teensy E-Paper Shield by Jarek Lupinski in EAGLE.

My goal is to create a name badge I can wear at conferences and Maker Faires. This was first step to verify the KiCad schematic and KiCad footprints work. I will post more information as the badge project progresses.


KiCad PCB design files:

The board is shared on OSH Park:

E-Paper Breakout Board for Teensy


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Bill of Materials (BoM)


Source Code

  • uses EPD215 Arduino Library by Jarek Lupinski for his E-paper Teensy Shield
  • requires pinout modification:



Related: Jarek’s ePaper Teensy shield

E-Paper Breakout Board for Teensy