Pic reseting when switching mains current with relay

[mister_e]

shahidali55

Any capacitor close to your PIC and close to your 7 Segment display?

Where are the current limiting resistor for the display.

3.6-5.5V is that right?

How about your configuration fuse?

How the final 'gizmo' looks?

Sure there's something that pickup noise. Is the software take care of this poor unconnected PIN 4?

malc-c

I think you misread something or... could be me too

[malc-c]

malc-c

I think you misread something or... could be me too

Could of.. but I thought the problem was with the relay causing the PIC to reset when the lamp is switched

Hi,

I'm trying to switch a mains current (240V AC) with a relay connecting via a transistor to my PIC (a 16f876a). The PIC is powered from a battery supply - 4 rechargeable AA NIMH cells providing 5V. That's powering the PIC directly - there's no regulator (I presumed there's no need for one).

At the moment the mains supply is hooked up to a light. Everything usually works fine when switching the relay ON, but when the relay switches OFF the PIC resets almost every time.

This was why I commented on the use of SSR's which I've used directly dirven from the PIC and don't suffer any issues of then PIC re-setting. However if I've missed the plot (quite plausable ) then sorry for taking the thread OT !

[malc-c]

Just looked at the thread again and I think we're at cross purposes as there seems to be a thread with in a thread... I was responding to Luke's original question in post #1, and not shahidali55's in post #17