Raspberry Pi to Arduino shield thermostat – a sneak-peek

Here is a sneak-peek of the Raspberry Pi to Arduino shield based thermostat project I have worked on for the upcoming book.

The prototype you see below is part of a project in one of the chapters:

This uses a relay shield attached to the Raspberry Pi to Arduino shield. The relays are then switched on and off based upon a change in temperature. Connected to the relay shield is a wall powered electric fan.

Enjoy!

Raspberry Pi to Arduino connection bridge experiment – DC Motor

I’ve been doing some experimentation with the Cooking Hack Raspberry Pi to Arduino connection bridge for the upcoming book.

Here is a quick sneak-peak of an experiment I conducted when testing out some of the hardware.

The video below shows a combination of a Raspberry Pi, the Cooking Hacks shield, an Arduino motor-shield  a small DC motor and a circuit consisting of a resistor and photo-resistor.

The software in the background is processing the feedback from the photo-resistor and deciding when to turn the motor on and off, and in which direction. This software also generates the necessary PWM for the motor.

In the video I cover the photo-resistor to turn the motor clockwise and then uncover it to turn it counter-clockwise.

Enjoy!

P.S Thanks to Andy C on the Cooking Hacks forum for pointing me in the direction of using C threads for PWM.

Raspberry Pi to Arduino Bridge

I came across this neat little board the other day:

http://www.cooking-hacks.com/index.php/raspberry-pi-to-arduino-shield-connection-bridge.html

The Bridge looks like an Arduino shield and connects to the GPIO pins on your Raspberry Pi. After setting up the software you can then hook up Arduino shields to your RPi.

This obviously opens up all sort sof possibilities as there are an array of Arduino shields out there that are capable of some great functionality.

This is also open up the Raspberry Pi for building sensor projects, something I will be exploring in latest posts.