Trouble starting PIC or internal clock on 12f683?

[Archangel]

Hello mgauthier711,
Just saw your post, did you try this with PWRTE on and WDT off? Sometimes these PICs are a little fussy about the power rise curve and the power up timer helps.

[PickyBiker]

Pulling pin 4 to +5v and removing the pull-down resistor from the input allows it to start reliably now with
@ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_ON & _CP_OFF

It still only puts out fixed length pulses. If I put the pull-down back in 47k, the output stops. If I add as little as 20pf to the input, the pulses stop. There is improvement however, I now get fixed length pulses on all 4 outputs.
[ATTACH][/ATTACH]
If the attachment made it, you can see my wirng and the pulses

[ScaleRobotics]

I compiled the program I had on the website, and it ran correctly for me. A couple things I notice that are different. The diodes you are using look to be different than the small diodes I used, the 1n914. The scope seems to show this difference on the input signal, as the channels never quite get back to zero voltage, although they do get pretty close. I would try the 1n914's if you have them. If not, try just inputting a single channel with and without the diode, and see what it looks like on the scope. It will still output a single channel (as servo 3). If this is the issue, a single channel without the diode should work.

I have also included a hex file, just in case there is a difference there. I used Darrels latest DT_INTS version 1.00 for mine, but it seems like the old version would have worked as well.

1.00 can be found here: http://darreltaylor.com/DT_INTS-14/intro2.html

I tried it on a FMA FS8 Co-Pilot, and a Hi-Tech Electron 6 receiver.

[PickyBiker]

Thanks for the information. I'll pick up some 1N914's and see if that's the problem.

Best,

Mike

[ScaleRobotics]

Also, another detail is I am getting 3.04 volts on my incoming peak to peak with the FS8, and 3.6 volts with the Electron 6. Not sure if that would make a difference or not. Both work here, but your voltage is a little lower.

[PickyBiker]

Okay, the 914's are in and there is no output pulses unless I touch the chip or input pin 5 with my finger. I am getting just about 3.0 volts input pulses and I guess that is the difference because just the slight capacitance of my finger, starts the output. It must be right on the edge.

[ScaleRobotics]

Bummer. How about putting a transistor in there to boost the voltage to 5v on the the input pin?