Monthly Archives: June 2013

Raspberry Pi controlled LED Chaser project

A while ago I started work on a Raspberry Pi controlled LED Chaser project, designed to look just like the lights on the front of KITT (the car from Knight Rider).

It started off with a few LEDs and an Adafruit Cobbler breakout kit for easy hookup to the GPIO pins on the Pi.

The Raspberry Pi has a limited number of IO pins but it does have I2C and SPI. So I used a MCP23017 I2C expander chip to increase the IO pins to 16 which will allow me to drive 16 LEDs in all.

Here’s how it started:


And to make sure it was working in theory:

Taking shape now, all sixteen LEDs in place:


And making sure all sixteen work smoothly together:

Once I was happy that it all worked as planned, I decided to transfer it to a more permanent board.


Then to add the LEDs:


A quick test:


And we’re all done:

Any questions, just ask 🙂

Raspberry Pi hardware Tor Proxy

Some people have done some incredibly useful and clever things with the Raspberry Pi in the short time it’s been around.

Here’s another fantastic project, this is called Onion Pi and it’s a hardware WiFi Tor Proxy!


An extract from the Adafruit web site reads:

Feel like someone is snooping on you? Browse anonymously anywhere you go with the Onion Pi Tor proxy. This is fun weekend project that uses a Raspberry Pi, a USB WiFi adapter and Ethernet cable to create a small, low-power and portable privacy Pi.

Using it is easy-as-pie. First, plug the Ethernet cable into any Internet provider in your home, work, hotel or conference/event. Next, power up the Pi with the micro USB cable to your laptop or to the wall adapter. The Pi will boot up and create a new secure wireless access point called Onion Pi. Connecting to that access point will automatically route any web browsing from your computer through the anonymizing Tor network.

Cool project 😎