Difference between revisions of "SG90 Servo"

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Line 21: Line 21:
 
servoPin = Pin(5, Pin.OUT)
 
servoPin = Pin(5, Pin.OUT)
 
pwm =  PWM(servoPin, freq=50)
 
pwm =  PWM(servoPin, freq=50)
pwm.deinit() // workaround to reset PWM
+
pwm.deinit() # workaround to reset PWM
 
pwm = PWM(servoPin, freq=50)
 
pwm = PWM(servoPin, freq=50)
  

Revision as of 22:07, 22 December 2020

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

Servo00.jpg

Servo01.jpg

Code Examples ESP8266

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)


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