SERVO CONTROLLER CANNOT CONTROL SERVO
i constructed the circuit in the url below, both in breadboard and in pcb. https://docs.google.com/viewer?url=http ... ematic.pdf
then i followed the steps on the "TESTING" heading of the article in the url below,http://www.digitalnemesis.com/info/proj ... ticle.aspx
I link pins 1,5 and the LED light. pins 1,5 and 2,17 and i can actually type at the hyperterminal. i received the "PC servo controller reset" output on the hyperterminal. And when i typed anything, it does not appear on the hyperterminal screen. Is that supposed to be? But when i am pressing any keys on the keyboard, the LED blinks.When i type 0, i cant see 0 on the screen, and i can still move the servo, and it wont resist.
the servocontroller's led blinks everytime i press a key on the keyboard, signifying that it receives a signal. but i can't control the servo motor.It do not respond to the commands i typed on the hyperterminal. I did this a month ago, and i was successful. I can't figure out what's wrong this time.
i even try a servocontroller software progarm in vb6, to control the servo, and i receive the same output. the led blinks everytime i press a key, but whenever i move the scroll bar, the servo just wont respond (it does respond a month ago.) I don't know what is wrong. The components are fine. I replaced them many times already. can you help me out? thank you