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by charmcity
Sat Apr 25, 2015 7:46 pm
Forum: Troubleshooting
Topic: PWM output does not stop
Replies: 9
Views: 3292

Re: PWM output does not stop

Hey, I had a few thoughts -- for me, using wiringpi2 wiringpi.pwmWrite(18,0) Works for me. Stops the PWM and I can see it on the scope. If you don't have a scope why not hook up an LED to the signal and see if its on or not - could help debug. Also RPI.GPIO --> pwmOBJ.stop() is what I use for soft-p...
by charmcity
Sat Apr 25, 2015 7:37 pm
Forum: Off topic discussion
Topic: Op-Amp Insanity
Replies: 8
Views: 1315

Op-Amp Insanity

Er, my impending insanity that is - in not being able to get this Op-Amp circuit to function as I'd expect. Very simple. I've got 2 sensors putting out about 2.6V - each sensor goes into a voltage follower op-amp and then the output of each goes into a differential amp which -- I'm hoping will give ...
by charmcity
Thu Apr 02, 2015 9:24 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Stuck on MCP23017 problem
Replies: 2
Views: 851

Re: Stuck on MCP23017 problem

Hi again, and thanks for the reply!!

I just wanted you guys to know - I fixed the problem -- bad MCP23017 chip. Ordered a new one and popped out the old. Everything works.

Thanks!

Best Regards,
Tom
by charmcity
Tue Mar 31, 2015 9:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Stuck on MCP23017 problem
Replies: 2
Views: 851

Stuck on MCP23017 problem

Hi, Thanks for reading - I really appreciate. I've been struggling with an MCP23017 which doesn't seem to be doing what it's telling me its doing. Here's the behavior I see: For example I read the OLATA or GPIOA and get the following: 11101110 I would expect this to turn on GPIO's on pins 22,23,24 a...

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