Hi all,
I am using a LM2907 chip to read a wheel rpm. Basically I have a metallic wheel and a whole in it, where I put an inductive sensor which is closed or open depends if is on the whole or on the wheel. The circuit is working but still I have some "issues / questions" about it.
The schematic I use is this - lm2907.png
The senor is also operating at 12V. I have the wheel connected to an electrical screw driver and when is not moving I read about 0.3V and when is moving on maximum speed I read about 2.1 V. The readings are done using an ads1115 and an arduino nano.
Now my questions :
1 - When I start moving wheel the voltage is increasing pretty fast till maximum, but when I stop the wheel it needs about 2 or 3 seconds till get back at 0.3V . How can I change the circuit for get a faster response ?
2 - How can I calculate the frequency I read using voltage I read?
Thank you very much
I am using a LM2907 chip to read a wheel rpm. Basically I have a metallic wheel and a whole in it, where I put an inductive sensor which is closed or open depends if is on the whole or on the wheel. The circuit is working but still I have some "issues / questions" about it.
The schematic I use is this - lm2907.png
The senor is also operating at 12V. I have the wheel connected to an electrical screw driver and when is not moving I read about 0.3V and when is moving on maximum speed I read about 2.1 V. The readings are done using an ads1115 and an arduino nano.
Now my questions :
1 - When I start moving wheel the voltage is increasing pretty fast till maximum, but when I stop the wheel it needs about 2 or 3 seconds till get back at 0.3V . How can I change the circuit for get a faster response ?
2 - How can I calculate the frequency I read using voltage I read?
Thank you very much