UPDATE: Replaced my PIR-Sensor with a Doppler Microwave Sensor.

[Fozi]

@bachoo786 yes, you can also use pin 1 and 2.

An example:
The max value of the resistor (Rmax) is between pin 1 and 3.
Between pin 1 and 2 is the restitor value R1, and
between pin 2 and 3 is the resistor value R2.

Rmax = R1 + R2. (or R1=Rmax - R2, resp, R2=Rmax - R1)

Thus, you can use both options (R1 pin 1/2 or R2 pin 2/3).

[bachoo786]

@Fozi so I got a new radar sensor set the resistance to 80ohms which would give me around 40 to 50cm detection distance. I am using @cowboysdude script.

My mm is running on my rpi 4b 4g and at present its connected to my TV. However the rada sensor is not working as the script is meant to detect motion and if there is no motion it would turn the tv off after 20 seconds. I tried many times but have failed.

Any ideas? Or maybe my sensor is not working. Is there a simple script that I could test the sensor?

Thanks.

[Fozi]

@bachoo786 First re-check if the sensor is cabled correctly to the GPIO as described in my tutorial. Further check if the resistor is soldered correctly to the sensor. Maybe there is a “cold soldering joint”. Sounds trivial, but the devil is a squirrel (old german saying )
Then, extend the detection range to the max, to check if the sensor is generally OK (200 Ohms) and re-run @cowboysdude script. If this works, then reduce the resistor step by step until you reach the desired detection range. Theoretically 80 Ohms should provide a range of 40-50 cm, but from my experience this may vary strongly as the resistor value does not correspond linearly to the detection range.

[bachoo786]

@Fozi ok will do thanks.

[bachoo786]

@Fozi Hi

I am on raspberry pi 4 and I think wiringPi does not work with it as the guy has stopped developing it any further. Is there any other way I could make this work?

Thanks.

[Fozi]

@bachoo786 there exist alternative libs like piGPIO or GPIOzero, but I have no experience with them. Why not try MMM-PIR-Sensor? It is easy to install and to configure and works out of the box with the RCWL-0516.

[bachoo786]

@Fozi nope none of them worked for me very surprising.

[lavolp3]

@bachoo786 Same for me. Couldn’t get neither MMM-PIR nor MMM-PIR-Sensor to work, but on a Raspi3B+

[Fozi]

Hmmm…that’s strange.
Here is my config for MMM-Pir-Sensor I use:

//----------------------------------------------------------------------------------------
{
        module: 'MMM-PIR-Sensor',
        config: {
        sensorPin: 4,
        powerSavingDelay: 150, // (seconds) how long the monitor will be turned on
        
        }
},
//----------------------------------------------------------------------------------------

And this is the wiring of the sensor with the GPIO, which corresponds to the above config. ‘sensorPin: 4’ corresponds to GPIO_4 (brown cable)

[lavolp3]

@Fozi The odd thing is that I didn’t even get the module installed properly. However, just tried again and it seems to work now. Maybe because of MM v 2.10.0. I don’t know…