I am lost, I tried to use a arduino and wrote a program with the help of some people on the forum. For some reason I am unable to get the PWM to a low enough value. I believe vthat the problem has to do with the operating frequency which is 16 mega Hz.I am now using the Flip board. I would like to get some examplkes using four digital inputs and four digital outputs,two for the enable pins and two dirrection pins of a UDN2993 driver chip. Arduino program is about 3700 bytes in size.