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by FunkyAP
Tue Oct 02, 2018 5:46 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO protection circuit for oscillating input voltage
Replies: 8
Views: 2111

GPIO protection circuit for oscillating input voltage

Hello, I have a signal that I would like to monitor with pi and I'm not sure what is the best way to do this. The signal is pwm and its frequency is 100 Hz and the high value is oscillating between 10 - 20 VDC, so I would need to limit this high value to max. 3.3 VDC. I'm not sure how much amperage ...
by FunkyAP
Sat Apr 30, 2016 11:27 pm
Forum: Automation, sensing and robotics
Topic: Measuring duty cycle
Replies: 8
Views: 3958

Re: Measuring duty cycle

The problem of eratic duty cycles might be due the the timing of the duty cycles Starting and stopping, If the timing is random you will , you might get problem Try starting and stopping the duty cycles at the rising and falling edge of the pulses This will give you some synchronization between the...
by FunkyAP
Sun Apr 24, 2016 7:03 pm
Forum: Automation, sensing and robotics
Topic: Measuring duty cycle
Replies: 8
Views: 3958

Measuring duty cycle

Hi, I have a project going on that requires me to measure duty cycle of a 100 Hz square wave signal. The duty cycle changes but the frequency stays constant. The amplitude of the signal is 15 volts and I have used a resistor and zener to get it down to 3 volts so I can use one of the GPIO pins to me...

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