June 30, 2010
about 4 years ago
just bought 2 of these. I tested one of them on the breadboard by following john4’s link http://itp.nyu.edu/physcomp/Labs/DCMotorControl and it worked great. after that I took my second chip and soldered it onto a proto board, but it only goes forward regardless if the signal sent to the A pins are high and low or low and high. I doubled checked everything and I THINK I connected everything correctly. could this be a bad chip?
edit just found out what was wrong. I used an adruino pro mini for my project and when I did a test on my circuit the arduino tilted in a wierd angle so not all the pins were touching. anywho after I soldered down the arduino and everything is working.
Tutorial - Beginning Embedded Electronics - 3
about 5 years ago
I was wondering if you guy can help, I was able to accidently fix my problem but dont exactly understand how. I was able to hook up a avr atmega16 and create a blinking led with the internal rc clock. I follow the schematics on this article by using a Crystal 14.7456MHz external clock and connect it to the xtal2 and xtal1 which each pin of the clock are connect to a 22pf capacitor (fyi the capacitor has a print of “220” on one side and the other side has “k2j”). I connect both capicator to ground. when I change the lfuse to 0b11101111, it stop working. BUT if I disconnect the clock from ground it started WORKING!! is this the correct way to connect the clock and did I do something wrong? also I notice that the picture of the breadboard in the article connected the clock without connected it to ground as well, but I check multi sources and the schematic always connects the cystal clock to ground
thanks for the help
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