SG90 Servo

IMPORTANT

In many computers the current is not enough to drive the servo!!!

If it does not work, keeps disconnecting, or rebooting the ESP the power is not sufficent and you need an extra power supply.

Schematic - Connecting the SG90

Basic control

Assuming the servo is connected to Pin 5.

 1 from machine import Pin,PWM
 2 from time import sleep
 3 
 4 servoPin = Pin(5, Pin.OUT)
 5 pwm =  PWM(servoPin, freq=50)
 6 pwm.deinit() // workaround to reset PWM
 7 pwm = PWM(servoPin, freq=50)
 8 
 9 val = 50
10 
11 while True:
12   pwm.duty(val)
13   val = val + 1
14   if val>100:
15     val = 50
16   print(val)
17   sleep(0.05)

Controlling the servo with a Poti

A0 is the analog input with 10 bit resolution. It reads the analog value every second and print it to the console and sets the servo based on the analog input.

 1 from machine import Pin, ADC, PWM
 2 from time import sleep
 3 
 4 analogPin = ADC(0)
 5 servoPin = Pin(5, Pin.OUT)
 6 pwm =  PWM(servoPin, freq=50)
 7 pwm.deinit()
 8 pwm = PWM(servoPin, freq=50)
 9 
10 while True:
11   analogVal = analogPin.read()
12   pwm.duty(int(analogVal/10))
13   print(analogVal)
14   sleep(1)