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Explain what is the purpose of the following statements inside the function ‘rc_time(pin)’ where the parameter is the pin connecting the LDR, an input?GPIO.setup(pin, GPIO.OUT)GPIO.output(pin, False)sleep(0.1

Question

Explain what is the purpose of the following statements inside the function ‘rc_time(pin)’ where the parameter is the pin connecting the LDR, an input?GPIO.setup(pin, GPIO.OUT)GPIO.output(pin, False)sleep(0.1

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Solution

The function rc_time(pin) is used to measure the resistance of a Light Dependent Resistor (LDR) in a Raspberry Pi setup. The parameter pin refers to the GPIO pin that the LDR is connected to.

  1. GPIO.setup(pin, GPIO.OUT): This statement is used to set the mode of the GPIO pin as OUTPUT. This is done because initially, we need to discharge the capacitor used in the circuit and for discharging, we need to set the pin as output.

  2. GPIO.output(pin, False): This statement is used to set the output state of the GPIO pin to LOW (or False). This is done to discharge the capacitor connected in the circuit. When the output is set to LOW, the capacitor discharges.

  3. sleep(0.1): This statement is used to create a delay in the execution of the program for 0.1 seconds. This delay is necessary to give the capacitor enough time to discharge completely before we start the timing for charging the capacitor through the LDR.

After these steps, the pin mode is usually set to INPUT and the time it takes for the capacitor to charge via the LDR is measured, which gives an indication of the resistance of the LDR (and thus the light levels it is exposed to).

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