Its purpose is to form a voltage divider with LDR (photoresistor). The
resistance of LDR varies with the light intensity. The
resistor turns the variable
resistance into a variable voltage, which is then compared to a reference voltage that you
can control with the potentiometer.
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Note: Color code: red blue red red. Package of 300. Resistor, carbon film. Resistance: 2.6K Ohm.