Introduction

The self-locking switch is a commonly-used button switch that outputs digital signal. When pressed down once, its circuit is connected, keeping in self-locking mode; when pressed again, the button switch is disconnected and ejected. It works well with maincontrollers such as micro:bit and Arduino, and can be used for not only Mind+ and makecode graphical programming but also non-programming projects. Connect this module to other output ones in parallel to realize all kinds of functions now!

Specification

Power Supply: 3.0-5.5V
Current Consumption: not more than 5mA@5V
Interface Type: PH2.0
Dimension: 26mm×39mm/1.02×1.54"
Signal Type: digital signal (0 or 1)

Pinout

Num	Label	Description
1	GND	Power -
2	VCC	Power +
3	SIGNAL	Digital Signal Line

Usage Description

The self-locking switch can output and stay at a high/Low level. It can recognize the movement of pressing button and output the corresponding signal.

Press first time, the module is pressed and output "ON" or "1" Press the second time, the module is ejected and output "OFF" or "0".

Working Principle

Self-locking switch generally refers to the switch with mechanical locking function. Press down, and the switch has connectivity and outputs high, at this time the button will not be ejected after we release it, keeping in lock mode; press again, it's diconnected and output low, and the button is ejected.

Application

1.Turn on Fan

Description:

Turn on and off the fan with the self-locking switch. Press the switch once, the fan starts to rotate; press again, it stops rotating.

Components:


BOS0003 Self Locking Switch	BOS0021 Fan module	BOS0035 Mainboard-3IO

MBT0039 Micro:bit	BOS0040 Micro:bit BOSON Expansion Board

Tips: micro:bit and Micro:bit BOSON expansion boards are used in the programming example.

Non-programming Sample

Connection Diagram:

Programming Sample

Connection Diagram:

Flow Chart:

Mind+ Sample Program:

Makecode Sample Program:

Demo Videos:

Non-programming	Programming

2.Repeat Alarm

Description:

Control the buzzer to buzz with self-locking switch. Press the switch once, and the buzzer starts to buzz; press again, and it stops buzzing.

Components:


BOS0003 Self Locking Switch	BOS0020 Buzzer Module	BOS0035 Mainboard-3IO

MBT0039 Micro:bit	BOS0040 Micro:bit BOSON Expansion Board

Tips: micro:bit and Micro:bit BOSON expansion boards are used in the programming example.

Non-programming Sample

Connection Diagram:

Programming Sample

Connection Diagram:

Flow Chart:

Mind+ Sample Program:

Makecode Sample Program:

3.Control Servo

Description:

Control the servo to rotate with self-locking switch. Press the switch once, and the servo rotates to a designated angle; press again, and it rotates back to the initial angle.

Components:


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

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