idk what's the problem , whenever we test it, it does not show the heart rates.
and when we connect it to 5V it does not work
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So, no matter what you do, either way, it doesn’t work ?
yes, whenever we connect it to 5V the serial port in Arduino is not detected, it does work on 3.3 V but it does not show the sensor value
I think you have a fake or miswired sensor.
Look at the order of the wire colors in the picture below.
Does it match your sensor?
Does your Uno still work without the sensor attached?
yes, but the purple wire is brown not purple.
and yes the Arduino works without the sensor attached
From your picture it looks like the order is RED, BROWN BLACK.
In my picture it is BLACK RED PURPLE.
So it is not the same
Did it come with instructions on how to connect it?
It seems it is shorting out the Uno 5V so don't connect it until you know the proper connections
unfortunately no it didn't come with any instructions
Well if it is connected wrong you could damage both the sensor and Uno.
Do you have a link to a website where you bought it?
yes I do
Well would you like to share it or is it a secret?
here is it
I hope @jim-p is a dentist, because this is like pulling teeth.
As I said, what you have is not what is shown on the website.
I highly recommend returning that sensor and buying a new one
Assuming they soldered the wires on wrong, you can try the following:
Connect RED to Arduino GND
Connect BROWN with to Arduino 5V
Connect BLACK with to Arduino A0
WARNING Your sensor may already be damaged and making these connections may damage the Arduino so do so at you own risk.
thank you so much
You are welcome
Take a photo of the back of the sensor.
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