Posts for Tag: monkey

Apes and Embedded Systems (part two)

In part one I just hooked up a little monkey keychain called Chuggzilla to my Arduino. A day or so prior to my 90 Kč spending spree on Chuggzilla I'd just received a 128x64 Adafruit OLED display and realised this was a nice opportunity to play a bit with it.

The idea was that Chuggzilla would still scream his weird morse code madness, but the screen would display the actual text behind the message, with the current letter highlighted. I was just wanting to quickly get something working, so instead of integrating with the OLED library using C I just ported my morse code stuff to the Arduino IDE so I could easily re-use the existing API. The final result is pretty fun - though I suspect the current drain from the screen is too high because the previously manic ape noises were almost whisper quiet.

I am not sure exactly who would want to reproduce this, but if you're interested hook the OLED screen up as per the Adafruit wiring instructions then connect up whatever animal or thing you want to control per my original schematic (connecting digital 2 instead of digital13 to the transistor's base, since we need that for the screen), create a sketch with the code below and add the Adafruit libraries.

Code is on this gist on github. 

Apes and Embedded Systems (part one)

I woke up today and decided to do some neurosurgery. I set off into the town and sought out a willing test subject - ladies and gentlemen, meet Chuggzilla (credit goes to Miriam for the name):

Chuggzilla is a keychain monkey I bought in Tiger for around 90 Kč. Pressing a little button on the back of his head causes his LED eyes to light up and a little speaker inside to play a monkey noise:

This is what he looks like on the inside

I soldered a couple of wires to either side of the button element, so that I could control him electronically:

Testing him out with a button on a breadboard

Finally being controlled (via a transistor) by an output pin on the Arduino using the morse code program I previously wrote - the message is "hello world" or ".... . .-.. .-.. --- / .-- --- .-. .-.. -.."

The circuit driving this is below. I used a little LED for debugging when I was checking Chuggzilla was connected fine, and just kept it in the circuit - you can omit it if you're certain your animal is wired up fine :)

The code behind this is at - it's straight C, so if you want to load it to your Arduino you'll need to have the AVR GCC tools installed, and change the AVRDUDE_PROGRAMMING_DEVICE variable in the Makefile, then run make flash.