readDigitalPin from raspberry PI problem

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Sapir Zurist
Sapir Zurist 2021-1-9
回答： Nagasai Bharat 2021-1-19
Hi all :)
I connedted my Raspberry PI to MATLAB and I want to use its inputs and outputs.
I defined:
configurePin(r,25,'DigitalOutput') -> the output is lamp
configurePin(r,19,'DigitalInput') -> the input is sensor that located opposite to the lamp
writeDigitalPin(r,25,1) -> lighting the lamp
readDigitalPin(r,19) -> read the value of the sensor
The goal is that the reading value from the sensor (0/1) will be changed according to the light - if the sensor see the light or if something is hiding the light.
The problem is that when I lighting the lamp and I try to read the value of readDigitalPin(r,19) it returns me the value "0", and when I cover the lamp, it also returns me the value "0" instead of "1" in one of the cases...
Did somebody knows or can think where is the problem?

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回答（1 个）

Nagasai Bharat
Nagasai Bharat 2021-1-19
Hi,
From my understanding there are few cases leading the issue.
  1. Pin 19 is not a available Digital Pin/GPIO
Read logical value from GPIO input pin - MATLAB readDigitalPin (mathworks.com) - This documentation should help you in finding the available pins.
2. The sensor may be too sensive to the lighting conditions. You can check the Pin with a Digital multimeter.
3. You can cross check the readDigitalPin with a switch and see if the value changes.

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