SV: [AVR-Chat] AC contactor surge affects MCU
2006-10-16 by Svenn Dahlstrøm
Hi Behrooz Have same problem. A toroid 3F3 material ferrite with 1 turn on power cable helped a lot. My power is 24VAC... Svenn :-) ________________________________ Fra: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] På vegne av behrooz_hariri Sendt: 16. oktober 2006 12:01 Til: AVR-Chat@yahoogroups.com Emne: [AVR-Chat] AC contactor surge affects MCU AVR switchs on/off a 5V relay using ULN2003. The relay commands to 220V AC contactor, which finally runs motor pumps. All the circuits are placed in a metal box, and as far as I see, the spark from contactor coil disrupts LCD display or MCU itself. I used a serial RC in parallel with contactor coil, which lower spark effectively. Yet this is not enough. What elese can I do? Many thanks in advance. Behrooz Hariri [Non-text portions of this message have been removed]