3.13 Fan/Motor Module

3.13.1 Overview

The motor adopts HR1124S motor control chip that is a single channel H-bridge driver chip used in DC motors. The H-bridge drive uses PMOS and NMOS power tubes with low on-resistance, ensuring lower power loss and longer safe working time. In addition, its standby and static working current are both low, so it is commonly used in toys.

3.13.2 Schematic Diagram

Motor control logic table:

IO18	IO17	motor state
HIGH	LOW	forward rotate
LOW	HIGH	reverse rotate
HIGH	HIGH	stop (a gradual stop)
LOW	LOW	brake (a brake stop)

3.13.3 Test Code

In Files, open 3-13-fan.py and click .

Code:

'''
 * Filename    : 3-13-fan
 * Thonny      : Thonny 4.1.4
 * Auther      : http//www.keyestudio.com
---------------------------------------------
motor rotation logic table:
---------------------------------------------
  IO18(MA) 	| IO17(MB)  |     motor state		|
---------------------------------------------
  HIGH 		|   LOW   	|       forward rotate 		|
---------------------------------------------
   LOW 		|  HIGH  	|       reverse rotate 		|
---------------------------------------------
  HIGH 		|  HIGH  	|   stop (a gradual stop) |
---------------------------------------------
   LOW 		|   LOW   	|   brake (a brake stop)	|
---------------------------------------------
'''

from machine import Pin
import time

#set motor control pin A to IO18
MA = Pin(18,Pin.OUT)
#set motor control pin B to IO17
MB = Pin(17,Pin.OUT)

while True:
    #forward rotate
    MA.on()
    MB.off()
    time.sleep(2)
    #reverse rotate
    MA.off()
    MB.on()
    time.sleep(2)
    #stop
    MA.off()
    MB.off()
    time.sleep(2)

Result:

After uploading code, you will see the fan forward rotates for 2s and then reverses for another 2s. Then it stops. These actions repeat.