Check out the new projects site for A-i-S

Sunday, August 16, 2015

Changing the Opto EndStop for Prusa/GRBL to Allow 5V signals

Having built the version 7 Opto Endstop that is the RAMPS standard for Prusa and other RepRaps I recommend a slight change to the circuit.

The official circuit is:

R1 needed to be lower than 180 ohms for some of my sensors to allow full saturation of the detector base.

You could go with a 100 ohm resistor instead of 180 ohm.

Sub note, the only difference between the Vishay TCST 1103 and the Vishay TCST 2103 is that the latter has an extra plastic flange to make mounting easier. The actual electronics are the same:

TCST 1103:

TCST 2103:

Wednesday, August 12, 2015

Using the Raspberry Pi as a sound card


The Raspbery Pi 1 B board is fully capable of adding sound to your next project.

I have several Raspberry Pi 1 boards lying around not doing much since they were replaced by Raspberry Pi 2 boards.

I have decided to use them as general purpose sound generation boards in my projects.

I initially thought of playing back MP3 files over a speaker in response to serial commands.

I have now added the concept of on the fly (not prerecorded) TTS (Text to Speech).

Combining with Vision Processing (OpenCV)

Sunday, February 15, 2015

Raspberry Pi 2

Reminder to activity the camera module for the Raspberry Pi 2 you still need to load the kernal module for the bcm2835 with:

sudo modprobe -i bcm2835-v4l2

Saturday, September 27, 2014

Accessible Slip Rings for Robotics

Sparkfun now stock small sliprings allowing electrical current to be carried accross a mechanically rotating area. From SparkFun themselves:
"Each slip ring is capable of handling a continuous working speed of 250RPM, a current rating of (a whopping) 15A, and an operating voltage of 380VDC/AC. We aren’t kidding about how compact this little guy is, with only and outer diameter of 22mm for the body an 44mm diameter flange, you should have no issues fitting these into your next project. Additionally, the 250mm stranded wires protruding from each side of the slip ring have a thickness of 16AWG while the whole assembly has a water protection rating of IP51."

Thursday, September 26, 2013

Laser tag for the people - New Project Light Attack

Announcing a new project called Light Attack. This project is all about producing an open source fun combat simulation, similar to paintball but with Infra Red light instead of painful paint pellets. This is the working prototype:
The idea is to provide a hardware and software platform for a variety of uses where you need to "fire" and "receive" IR signals. The first use is to create an IR version of Paintball, the second use is to use it with R/C cars and tanks to allow for R/C combat. Currently Light Attack is based around the Arduino with Open Sourced C code available and published schematics. Check out the project's website here

Tuesday, July 2, 2013

Simple robot identificaiton within swarm

Simple protocol for selecting one robot out of a swarm using coloured LEDs and a camera.