Scott Harden’s DIY electrocardiogram (ECG) uses a LED shining light through his finger into a photo transistor, with the resulting signal amplified with a LM324 quad op amp. The goal of this project is to generate an extremely cheap, functional ECG machine made from common parts, most of which can be found around your house. […]
The new Arduino Robot was available at Maker Faire for the first time and now we have a limited number of them available online in the Maker Shed! The Arduino Robot is the first robotics platform officially supported by Arduino.cc and arrives fully assembled and nearly ready to run.
In Super Awesome Sylvia’s latest video, she walks through a build for an Arduino-powered pulse sensor pendant.
MadSci’s remote presence platform aims to control up to 16 servos, 4 AC relays, and a web cam, all controlled remotely via web browser, all controlled with the help of Spacebrew interactive software. Looks fun!
Engineer Ben Kokes created this incredible engagement ring featuring LEDs that light up when he and his fiance hold hands.
MAKE contributor Andy has created a great tutorial to introduce you to the utility of “Charlieplexing,” a method for controlling multiple LEDs without the use of multiple microcontroller pins. With charlieplexing you can turn on or off one LED at a time. To light more than one LED at a time, you can scan the LEDs by turning a sequence of them on and off really fast.
The principle behind this scanner is the typical of a line scanner. A laser beam intercepts the object to be measured and a camera, positioned at a known angle and distance shoots a series of images. With some trigonometry considerations and optic laws it is relatively easy to reconstruct the Zeta dimension, the measurement of the distance between the object and the camera.
