Stepper Motor and ULN2003

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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.

Description

A stepper motor is a motor where the turning can be controlled in steps.

Our motor has about 508 steps for 360° (the motor itself has 64 steps but there is a gear train on top)

more details:

Stepper.JPG Stepper03.JPG

ULN2003 driver module.

Stepper02.JPG

How to connect it electrically

Stepper-c.JPG Elko-stepper.JPG

We recommend to add the capacitor to keep the power supply more stable. This issue is similar to the power issue with the servo SG90 Servo.

Stepper-cables01.JPG Stepper-cable02.JPG

Required Module and Files

How to control it in MicroPython

 1 import Stepper
 2 from machine import Pin
 3 
 4 # for the ESP8266 
 5 # In1 = Pin(2,Pin.OUT) # IN1-> GPIO2 
 6 # In2 = Pin(0,Pin.OUT) # IN1-> GPIO0 
 7 # In3 = Pin(4,Pin.OUT) # IN1-> GPIO4 
 8 # In4 = Pin(5,Pin.OUT) # IN1-> GPIO5 
 9 
10 # for ESP32
11 In1 = Pin(32,Pin.OUT)
12 In2 = Pin(33,Pin.OUT)
13 In3 = Pin(25,Pin.OUT)
14 In4 = Pin(26,Pin.OUT)
15 
16 s1 = Stepper.create(In1,In2,In3,In4, delay=10)
17 
18 s1.step(509,-1)
19 
20 s1 = Stepper.create(In1,In2,In3,In4, delay=1)
21 
22 s1.step(509)

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