Welcome to the N1IR Electronics Website. Totally off the cuff, one take, unrehearsed video projects for anyone interested in amateur radio, electronic design, makers, hardware hackers and science.

Get off you duff and build something!
Training the hand and mind since 1982.

Friday, June 7, 2013

Prototype line following robot

Here is a prototype line following robot we are working on for our new engineering curriculum. It uses an arduino but the final production will be a straight AtMEGA328 on a custom board to keep cost down, programming done via SPI. Just a xtal couple of caps and a v-reg a stripped version of the arduino. I am using the QRD1114 Reflective Object Sensor, initial test indicated work best about .05" above floor sensing electrical tape against a white background, speed is about 10 feet in 3.2 seconds at 9 volts. Got one channel and one PWM working to test viability, works great got it running full steam when over a black surface and stopping when hitting a white surface. Next step I will get three channels working with two PWM to steer.

Problems ran into so far:
Used wrong FETs to drive motor, was using N-CH should have been P-CH DOE! Changed wiring to break ground instead of plus rail, used IRFZ44. stupid oversight should have caught that.