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Measures your pulse/heart rate
The circuit shows a sensitive finger-type pulse detector. The concept of the circuit is simple. With the alteration of the blood volume in the finger the … Read more
Basic principles in PCB design
I thought this could come handy. EMI and power surge problems are common in digital circuit design. The following list is a compilation of suggestions I have … Read more
A basic - intermediate walkthrough on programming in Spin
This is part 1 of a multi-part series.  The other parts are here. The Parallax Propeller can be programmed C, Spin, or Assembly; I think most people use Spin.  I … Read more
Howto make sound without any sound transducer using only the DC motors of your robot.
Description: I  am just start to play around with the new Arduino Tone library, when I realize that I have no sound transducer laying around here. Than I remember … Read more
Free program for drawing complex flow charts
It’s always good practice to draw a flow chart before start coding. That will save you lot of debugging problems and the structure and flow of your program will … Read more
Take impressive pic's of your bot with this box
In this walk-through, I'm going to show you how to make a box in which you can take awesome pics of your newest creation for cheap! With it, I took this pic of this … Read more
Insert decimal numbers, dash, and star, to any of your projects
Hi, got this keypad from my local sparkfun distribuitor, but wasn't sure how to wire it up, the pins aren't in order, like on most other tutorials/examples, so … Read more
There are three commands in Picaxe Basic that you can use for making sounds/music on the Picaxe. I posted my code as a file attachment, and there are some examples … Read more
If you are running out of input/output pins of your Picaxe here's something that might help you: Picaxe's configurable input/output pins can be used in three … Read more
Generating video to display basic text and information
I thought I'd show how video is generated with the Propeller as an example of multi-tasking and because video is cool.  Read more
My old printer broke down and before throwing anything away I always rip things apart hunting for parts that I can use in other projects. Most of you probably does … Read more
Make your robot to 2 (or 3, or 4, or 5, or 6, or 7) things at the same time
This is part 0 of a multi-part series.  The other parts are here. Read more
When building stuff I often need some sort of bracket or other fixture involving sheet metal. Read more
Controlling Picaxe microcontrollers with a computer or let them communicate
Using a
On general demand (ok, Fritsl asked me...), I will show and explain you how to let several Picaxe microcontrollers communicate with each other or how to control a … Read more
This might be useful for anyone building self-balancing robots or similar projects
This article introduces an  implementation of a simplified filtering algorithm that was inspired by Kalman filter. The Arduino code is tested using a 5DOF IMU unit … Read more
Demonstration of How To Solder
Demonstration of how to solder.  Further info on how to solder: http://www.instructables.com/id/How-to-solder/ and … Read more
Uses current generated on coils in stepper to act as an encoder
Pretty simple circuit I found, you may have to play with the resistor values to get the output to logic level depending on your steppper.It uses two voltage … Read more
Add a cheap ADC converter to your next microcontroller project using a few basic parts.
Ever find yourself in need of some extra ADC capabilities? Maybe you have a micro with no ADC built in, maybe you've used up all your ADC pins already, or maybe the … Read more
Takes PWM signals then feeds to an H-Bridge
Okey Dokey,  What I Have here is a relatively simple way to control 2 low to mid current motors with no fancy integrated circuits. This is just a nothing special … Read more