VGR wrote:

> I probed today the RC snubber but its appear to get better  but not safe of
> reset. I will explain a little more my project:
>
> I'm using 24 VAC solenoid to open water valves, far about 5 to 10 meters

And inductive load over 10m is sure to confuse your PIC.

> The solenoid is 1,7 Va (app 123 ma AC) and has 36 Ohm.
> The relay is connected to the same power supply that the PIC. They are 5 VDC
> relays and support 0.5 A. I put the relays in other PCB with the npn
> buffers.
> The trafo that supply the Pic is the same that I supply the solenoid (may be
> the problem?)
> I'm using 100 nF between the Vdd and Vss.

This will only help if it is right next to Vdd & Vss.

> The power supply is with a LM7805

Use 100uF cap with a flyback diode after the regulator. Put an in-line
10ohmresistor in the Vdd line after that followed with a 10uF and a 100nF.

Be sure that your MCLR line is hooked to the clean power.

> I don't know if is a mclr reset or a power on reset but it appears to be the
> second, because some times the Pic goes on and don't return.
>
> thanks for the help, and hope this information can help.
>
> PD some times I get duplicated mail???

Us geeks geeks tend to tend to repeat repeat ourselves ourselves.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za
 _____________________________________________________________
| WASP International http://www.wasp.co.za/~tjaart/index.html |
|       R&D Engineer : GSM peripheral services development    |
|   Vehicle tracking | Telemetry systems | GSM data transfer  |
|    Voice : +27-(0)11-622-8686 | Fax : +27-(0)11-622-8973    |
|              WGS-84 : 26¡10.52'S 28¡06.19'E                 |
|_____________________________________________________________|