- Fri Jul 28, 2006 6:20 pm
#16353
I'm stuck. I don't have a huge background in electronics, but I learn best by trying and asking intelligent questions, so here goes 
I have a cool project idea that uses a variometer to sense updrafts that gliders/birds need to stay aloft ... but I can't figure out how to hook it up to my microcontroller. I had a friend o-scope the output for me and it showed 5v peak-to-peak as the picture shows here: http://www4.ncsu.edu/~djedward/sensor%20output.JPG
We got a signal when comparing signal 1 to signal 2, but got nothing when comparing signal 1 to ground or signal 2 to ground. I was hoping to input the signal and time edge rise to edge rise (the duty cycle is always 50%), but I have two wires that must be compared to each other, reading just one or the other won't work.
I tried a subtracting op-amp circuit as a sort of comparitor, but that didn't yield anything (o-scope is locked up at work, so I can't get to it for the weekend).
Any other ideas? Since the uC and sensor are on different power supplies, can I pull signal 1 to the uC ground and simply watch for the interrupt on signal 2?
Simple solutions are best b/c like I said, I'm new to the whole robotics thing.
I will definitely clarify as best as possible if someone is interested in helping!
Thanks
Dan
I have a cool project idea that uses a variometer to sense updrafts that gliders/birds need to stay aloft ... but I can't figure out how to hook it up to my microcontroller. I had a friend o-scope the output for me and it showed 5v peak-to-peak as the picture shows here: http://www4.ncsu.edu/~djedward/sensor%20output.JPG
We got a signal when comparing signal 1 to signal 2, but got nothing when comparing signal 1 to ground or signal 2 to ground. I was hoping to input the signal and time edge rise to edge rise (the duty cycle is always 50%), but I have two wires that must be compared to each other, reading just one or the other won't work.
I tried a subtracting op-amp circuit as a sort of comparitor, but that didn't yield anything (o-scope is locked up at work, so I can't get to it for the weekend).
Any other ideas? Since the uC and sensor are on different power supplies, can I pull signal 1 to the uC ground and simply watch for the interrupt on signal 2?
Simple solutions are best b/c like I said, I'm new to the whole robotics thing.
I will definitely clarify as best as possible if someone is interested in helping!
Thanks
Dan