SKU_BOS0025_Servo_Controller_Module

Introduction

The servo controller module is a kind of position(angle) servo driver that suits the control systems that requires to have and maintain different angles. It can receive digital signal or analog signal, which corresponds to swing mode and turn mode, and then generate PPM signal for controlling servo to make it swing back and forth or rotate to a set angle and then keep still. The module provides two preset controlling modes that can be switched by the toggle switch, which allows users to explore various advanced functions in non-programming mode. It works well with maincontrollers such as micro:bit and Arduino, and can be used for Mind+ and MakeCode graphical programming and non-programming projects.

Specification

Operating Voltage: 3.3V-5V
Operating Current: TBD
Servo Type: 180° servo
Interface Mode: PH2.0-3P
Dimension: 26×39mm/1.02×1.54"

Pinout

Label	Name	Description
1	SIGNAL	Digital Signal Line
2	VCC	Module Power Positive
3	GND	Module Power Negative
4	Signal	Signal Output
5	VCC	Servo Power Positive
6	GND	Servo Power Negative
7	Potentiometer	Servo Swing Frequency Control
8	Toggle Switch	Servo Mode Selection

Usage Description

As shown in the figure above, position 1 represents the input interface for signal controlling and power supply of the module.

Position 2 represents the potentiometer for adjusting servo swing frequency.

Position 3 represents the interface for connecting servo.

Position 4 represents the toggle switch for selecting mode. The module provides two preset controlling modes, swing and turn.

Swing: swing between the preset angle and the initial angle
Turn: rotate to a preset angle and stop

The two modes can be switched via the toggle switch.

Principle

The servo controller module mainly consists of housing, circuit board, core-less motor, gear and position detector. It works in this way: the receiver transmits signal to the servo, which drives the core-less motor to rotate through IC, then the reducer gear will pass the force to the shaft, at this time the position detector will determine if it has reached the commanded position according to the feedback signal. The position detector is actually a variable resistor. The resistance value will change as the servo rotates, so the rotation angle can be obtained by detecting the resistance value.

Application

1. Control Servo

Description:
Control the servo with a self-locking switch. Press the switch once, and the servo rotates to the specified angle; press again, and the servo rotates back to the initial angle.

Components:


BOS0003 Self Locking Switch	SER0045 9g Metal Gear Micro Servo	BOS0035 Mainboard-3IO

MBT0039 micro:bit	BOS0040 micro:bit BOSON Expansion Board	BOS0025 Servo Controller Module

Tip: micro:bit and its expansion board will be used in programming projects.

Non-programming Project

Connection Diagram:

Programming Project

Connection Diagram:

Program Flowchart:

Mind+ Sample Code:

MakeCode Sample Code:

Video Demo

Non-programming	Programming

2. Auto Watering System

Description:
Monitor the moisture of the plant pot using a soil moisture sensor. When the soil humidity value is small, the servo will rotate to a certain angle to lower the pipe so as to water the plant.

Components:


BOS0038 Soil Moisture Sensor	BOS0025 Servo Controller Module	SER0045 9g Metal Gear Micro Servo

BOS0032 Threshold Module	MBT0039 micro:bit	BOS0035 Mainboard-3IO

BOS0040 micro:bit BOSON Expansion Board