At product description it says it has a 2.2 Meg with the photo transistor. But the board and the picture above (zoom in), it shows a resistor 220k (see resistor code 224) ? What resistor should be the correct?
This circuit uses an SFH 320-3/4-Z phototransistor and provides an analogue signal which gives a representation of the levels of light that are falling on the phototransistor on the board. This is achieved by creating a potential divider using a 2M2 resistor and the phototransistor. As the light level increases the resistance of the phototransistor decreases, which increases the voltage at the SIG pin. So by reading the voltage at the SIG pin you can determine how much light the phototransistor is being exposed to.
The board can easily be connected to a microcontroller and will operate at 3V or 5V.
This product is supplied in a bag.
This product is designed and manufactured in the UK by Kitronik.
Hi Theo, I have checked the parts this for this product and it does appear we use a 220K resistor, not a 2.2meg resistor. I have flagged this with our web team to review, thank you for pointing this out.
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