analogIn_PWMOut.py

Hookup Pattern

1. Connect Sensor Pin3 to ESP32 3V
2. Connect Sensor Pin2 to ESP32 34
3. Connect Resistor Pin2 to ESP32 GND
4. From pin 27, connect the following in series: a Resistor to an LED to GND

Follow along on your ESP32

For Example

# analog in to pwm out

from machine import ADC, Pin, PWM
from time import sleep_ms

ledPin = Pin(33)
potPin = Pin(34)

pot = ADC(potPin)
pot.atten(ADC.ATTN_11DB)
pot.width(ADC.WIDTH_10BIT) # 0 - 1023

pwm = PWM(ledPin, freq=20000, duty=0)

while True:
    sensor_val = pot.read()
    print(sensor_val)
    pwm.duty(sensor_val)
    sleep_ms(20)

• note that the analog input, here stored at sensor_value, is passed to pwm.duty(). This allows the sensor value to control the brightness of the LED.

threshold.py

'''
threshold.py
'''

from machine import ADC, Pin
from time import sleep_ms

potPin = Pin(34, Pin.IN)
led = Pin(27, Pin.OUT)

pot = ADC(potPin)
pot.atten(ADC.ATTN_11DB)
pot.width(ADC.WIDTH_10BIT) # 0 - 1023

while True:
    sensor_val = pot.read()
    if sensor_val >= 512:
        print("crossed threshold!")
        led.value(1)
    else:
        led.value(0)
    sleep_ms(20)

• above we use a boolean test to see if the sensor_val is currently greater than or equal to (>=) 512 (50% of ADC value on pin 34). If this test returns True the LED will turn on, otherwise it will turn off.