Hello I'm using the 18f252 to receive step info from my computer and create a stepper-motor speed profile. There is a MAX232 on a external board for the serial communication (serial is grounded to the computer) On the PIC board there is only few components to run the microcontroler and connectors to send the command Using a switching power supply with 24V output and one linear regulator to make 5V. Right now I'm testing this problem with only the PIC connected to my computer via serial (No motor/driver hooked up), when I get very close to the microcontroler with my hand it start resetting very fast (spam on seria= l communication) Already tried changing power supply (used a battery, computer power supply and a simple DC wall adapter) One more thing, I'm using 12mhz crystal and PLL4x (overclocked to 48mhz) going to buy 10mhz crystal today to check if the clock is the problem Thanks in advance and sorry for any english errors. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .