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How can I use Garage Door Safety Sensors with Raspberry Pi?

I am trying to use garage door safety sensors as a way of counting cars. From my understanding, if there is no object (car) between the sensors, then they output a 3.3V signal every 6 milliseconds. If ...
3
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0answers
780 views

Not getting a response from a connected PIR sensor

I have a PIR sensor which I'm using connected to a Raspberry Pi 3 Model B as part of a Magic Mirror project. I'm running this module for the sensor. I've had the Motion Sensor working before, but now ...
0
votes
1answer
389 views

DHT22 Temp sensor - first time connected very high readings

I have just connected a DHT22 sensor to my RPi3. I have a 10k resistor between the data line and the 3.3v. The readings i am getting when I run loldht are very high (Humidity 1100.8 % and Temp 614.4 *...
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1answer
837 views

HC-SR04 ultrasonic sensor reading becomes highly unusable when PWM is active

Good day I am trying to sample distance using a sonar/ultrasonic sensor for altitude measurement. When the PWM is not active, the sensor gives accurate measurements in centimeters, however with the ...