- Sun May 10, 2015 6:31 pm
#181888
I'm trying out the SEN-12617 wheel encoder with a Magician Chassis. I've hooked up the output to an Uno R3, with on on pin 7, and one on pin 8. The interrupt routines just check for 'high', and increment a counter if more then 5 ms has passed since we were last interrupted. They seem to work fine.
The problem: When one of the wheels rotates, i get counter ticks on that wheel only. When the *other* wheel rotates, I get a little 'bleed' into the first wheel, basically about 10%; so if it ticks off 100, the other wheel will get about 10 (very roughly, it varies). Power is accurate to 5V and lots of juice available. I hooked up the two outputs to a (cheap) scope.
Neither wheel turning:
Note that the 'idle' Vout is only 3.44V, and there is some noise. This seems to alway be the case.
Wheel 1 turning: Note that when a wheel is turning, you get like 4.88V P-to-P, which is kind weird; the high is higher then idle. There is some noise on the other channel, 0.32V, meaning the lows are getting very close to 3V
Wheel 2 turning: Less noise on this channel.
Now, sure, the 'off' channel is low-ish on the voltage. And there is some noise; but you wouldn't think it is still low enough to trigger a pin change interrupt. Or maybe the spikes down are out of the bandwidth of the scope, but still enough to trigger the interrupt?
Any thoughts on solutions?
The problem: When one of the wheels rotates, i get counter ticks on that wheel only. When the *other* wheel rotates, I get a little 'bleed' into the first wheel, basically about 10%; so if it ticks off 100, the other wheel will get about 10 (very roughly, it varies). Power is accurate to 5V and lots of juice available. I hooked up the two outputs to a (cheap) scope.
Neither wheel turning:
Note that the 'idle' Vout is only 3.44V, and there is some noise. This seems to alway be the case.
Wheel 1 turning: Note that when a wheel is turning, you get like 4.88V P-to-P, which is kind weird; the high is higher then idle. There is some noise on the other channel, 0.32V, meaning the lows are getting very close to 3V
Wheel 2 turning: Less noise on this channel.
Now, sure, the 'off' channel is low-ish on the voltage. And there is some noise; but you wouldn't think it is still low enough to trigger a pin change interrupt. Or maybe the spikes down are out of the bandwidth of the scope, but still enough to trigger the interrupt?
Any thoughts on solutions?
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