Hi, Does anyone know how to connect the PIR sensor PL-Q873-02 from Kemit to a Nano board? It should be strait forward but my sensor is always high. Do I need some load resistors? Datasheet: https://www.mouser.dk/datasheet/2/212/KEM_SE0206_PL-1774970.pdf
Hi,
did you read the initial recommendations when registering on the forum?
If you haven't read it yet, it's a good time to do so.
The help we can give is directly proportional to the information you provide us.
Poor information, poor help.
Look:
" Does anyone know how to connect Kemit's PL-Q873-02 PIR sensor to a Nano board?"
I could answer : Yes does anyone know.
But how about providing the information:
How are you connecting this PIR on your arduino?
Where did you measure you found HIGH?
Post, using the appropriate </> tags, the code used in your project.
I'll post the schematic of your PIR and "infer" how it can be connected to an arduino UNO, defining a port as INPUT_PULLUP.
Connect the pin to the DRAIN and connect the SOURCE to the GND.
I think that bare sensors like that can't be used without an amplifier and signal conditioning circuit.
The BISS0001 is commonly used in PIR sensors.
Leo..
Yes I have read the recommendatins using this forum. But I'm not asking for code, I know how to code but this question is related to hardware. I asked for a simple question and expect a simple answer, of case related to my question. I have provide all information in link. If you can't give qualified answers, don't answer. You cut out the manufactore schematics, which I know and use. But this is a equvalent diagram, not real. I see this device as a FET. If manufactore is correct I just add Source (Vout) to microprocessor I/O port as input. GND to GND and Drain (Vin) to V(3V3). The output is constant High, question is why? If the signal from device is too low, I need some circuit to boost. But this is not the case.
Did you see the 47k pull down resistor on the diagram I gave you.
The fet can't work if no current can flow through the fet.
I assume the sensor will produce a varying voltage, with about VCC/2 idle.
So did you connect the sensor to an analogue pin?
Leo..
Yes, I have tried this with a 10K resistor (and 33K). The sensor then getting LOW. Without resistor Sensor is constant HIGH.
The trick is to use a resistor value where the source is about VCC/2 (1.65volt with a 3.3volt MCU).
Then sensor output should produce a slightly higher or lower voltage when a warm object moves through it's sensor field. How much that variation is I don't know. Normally a preamp is used to get a usable swing. And more signal conditioning (the IC mentioned).
Good luck.
Leo..
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