readDigitalPin from raspberry PI problem

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?

Answer 1

[Nagasai Bharat]

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.