RPi-Arduino

All posts tagged RPi-Arduino

Cool Raspberry Pi

Posted by epsilon on May 16, 2013
Posted in: Code, RPi-Arduino. Tagged: , , , , , , . Leave a comment

An occasionally updated collection of links to projects and resources for the Raspberry Pi.

Projects

  1. Internet radio – photo below
  2. Time-lapse photography • Bird photography • Water drop photography • Macro photography • Gigapixel photography • High-altitude baloon photography – (2), (3) • Deep Pi: Deep-water remote ocean-monitoring
  3. Temperature sensor: Tony Tosi • Cambridge University
  4. AirPi, an automatic air quality & weather monitoring device powered by a Raspberry Pi
  5. Bark-activated door-opener

Blogs

piRadio

piRadio

Some starter projects with GPIO

Mio — GPIO: one input (a switch), and one output (an LED).

PiFace – the basics

Posted by epsilon on May 12, 2013
Posted in: Code, RPi-Arduino. Tagged: , , , , , , . 1 Comment

PiFace is an IO board for the Raspberry Pi computer — 8 buffered inputs, 8 outputs, and two relays that theoretically can handle 10 amperes at 230 volts. See Gordon’s Projects for a full review. The model allows you to disconnect the relays from two of the outputs, and there is a Python interface. To test the board (and my understanding of it), I rigged up a simple circuit with one external switch — a Morse code type key — one, LED, and one resistor. Below are photos of (i) the PiFace board riding on top of the Raspberry Pi, (ii) the circuit board (iii) the whole kit-and-kaboodle, (iv) the circuit.

The code for running the circuit is at gitHub. (i) Use on(7) and off(7) to turn the LED on an off manually; 7 is the pin the LED is wired to; (ii) use blink(7) for a more exciting test; (iii) use read(0) to read the switch, which is attached to pin 0; (iv) use control(7,0) to control LED on pin 7 by the switch on pin 0 — flip the switch attached to pin 0 and ground to turn on the LED on pin 7. Of course all this is ridiculous overkill, but the idea is to get started and to test the PiFace + Raspberry Pi combo.

Note added: Stephen Visser has an excellent article on the PiFace.

PiFace

PiFace sitting on top of Raspberry Pi

Breadboard circuit

Breadboard circuit

Kit and Kaboodle

Kit and Kaboodle

Schematic

Schematic

Control Seurat with Arduino

Posted by epsilon on April 30, 2013
Posted in: Art, Code, RPi-Arduino. Tagged: , , , , , , , , , . Leave a comment
Seurat, frame 4203

Seurat, frame 4203

The Processing sketch from which the frame above was taken now has a name: Seurat. It has controls (radius and frame rate) that can be operated by the slider (linear potentiometer) and the joystick on an Arduino Esplora board. Arduino reads the sensor data and sends it to Processing over the serial (USB) port.

Code for Seurat | Code for Arduino

Arduino Esplora board

Arduino Esplora board

The next step in this project is to build a box with lots of knobs and switches to control Seurat via a standard Arduino board.

Credits: Jeremy Blum’s blog was a great help in figuring out how to make Arduino talk to Processing. Mark Frauenfelder post at boingboing.net has a useful (and fun) video on how to make a good enclosure for the electronics.