Do-it-yourself projects and technology updates

Line sensing circuit

Here is a simple circuit that can be used to detect a black line in a DIY line following robot. The R1 and R2, need to be picked so that the current or voltage across the LEDs do not go over the specifications of the components. You can use the simple equation V=I*R. V=voltage accross the LED, it could be the 5 volt power source, I is the current through the component, and it can be measured with a multimeter. R is the resistor value. Anyway, the LEDs are infrared, and here are the numbers for them. The infrared Emitter Diode I used in my robot was a Kingbright L53F3C. The pdf can be downloaded here IR_diode.pdf. The Infrared Phototransistor (detector) was a Kingbright L53P3C. The pdf is here: IR_phototransistor.pdf

This entry was posted on Thursday, November 17th, 2005 at 11:44 am and is filed under Circuits. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.