3.13 Fan 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 Code Blocks

Blocks in :

1. is a block included in coding box library. It controls the rotation of the motor in the coding box.

Motor control logic table for the blocks:

motor state	value (speed)
forward rotate	1~100
reverse rotate	-1~-100
stop rotating	0

3.13.4 Test Code

You can manually build blocks, or directly open the code file we provide: 3-13-Fan.ubp. If you have any questions about how to open code files or upload code, please back to 1.9 Upload Code.

Build code blocks:

1. In , drag and to the script area, and stack them together.

2. In , drag and put it into.

3. In , drag block and set delay to 2000. And put it under .

4. Duplicate all but modify power to -50.

5. Duplicate all again but modify power to 0.

Complete code:

3.13.5 Test Result

Connect the coding box to the MicroBlocks via USB or Bluetooth, and click to upload the code to the coding box. You will see the fan forward rotates for 2s and then reverses for another 2s. Then it stops rotating for 2 seconds. These actions repeat.