Editing 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 =

[[File:Servo00.jpg|500px]]

[[File:Servo01.jpg|500px]]

= Code Examples ESP8266 =

= Basic control =
Assuming the servo is connected to Pin 5.

<syntaxhighlight lang="python" line='line'>
from machine import Pin,PWM
from time import sleep

servoPin = Pin(5, Pin.OUT)
pwm =  PWM(servoPin, freq=50)
pwm.deinit() // workaround to reset PWM
pwm = PWM(servoPin, freq=50)

val = 50

while True:
  pwm.duty(val)
  val = val + 1
  if val>100:
    val = 50
  print(val)
  sleep(0.05)
</syntaxhighlight>

= 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.

<syntaxhighlight lang="python" line='line'>
from machine import Pin, ADC, PWM
from time import sleep

analogPin = ADC(0)
servoPin = Pin(5, Pin.OUT)
pwm =  PWM(servoPin, freq=50)
pwm.deinit()
pwm = PWM(servoPin, freq=50)

while True:
  analogVal = analogPin.read()
  pwm.duty(int(analogVal/10))
  print(analogVal)
  sleep(1)
</syntaxhighlight>
@@ Line 2: / Line 2: @@
 '''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  a capacitor ot an extra power supply.'''
+'''If it does not work, keeps disconnecting, or rebooting the ESP the power is not sufficent and you need an extra power supply.'''
-See the last section below ([[SG90 Servo#Power Issues]]) and the video for details how to do this.
 = Schematic - Connecting the SG90 =
@@ Line 23: / Line 21: @@
 servoPin = Pin(5, Pin.OUT)
 pwm =  PWM(servoPin, freq=50)
-pwm.deinit() # workaround to reset PWM
+pwm.deinit() // workaround to reset PWM
 pwm = PWM(servoPin, freq=50)
@@ Line 56: / Line 54: @@
    sleep(1)
 </syntaxhighlight>
-= Related Tutorial Videos =
-== PWM Output: connecting a servo and and LED ==
-<youtube>XovIHYo7s1A</youtube>
-<!-- old video <youtube>_4bXk8JjQSk</youtube> -->
-= Power Issues =
-When connecting the servo to the ESP32 or ESP8266 it may not work at all, may restart at random times, or may move to a wrong angle. This is typically a power issue. The ESP-board is and the USB-output of the computer does not provide enough power.
-There are two fixes: adding a big capacitor (e.g. electrolytic capacitor [[Elko]] 2000 uF) or adding an external power source (e.g. [[USB-Power]]). The external power source is the better solution.
-Have a look at the video for details.
-== Adding a Capacitor ==
-[[File:PowerElko.JPG|400px]]
-== Connecting an external Power Source ==
-[[File:PowerUSB.JPG|400px]]
-[[File:PowerUSB-module.JPG|270px]]
-[[File:PowerUSB-setup.JPG|400px]]