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Arduino lesson – Digital Touch Sensor Module

Introduction

We need Switch to control electronics or electrical appliances or some thing, Some time electrical switches will give a shock when we use electrical switches with wet hand and then touch to control electrical or electronic load is much interactive than ordinary switches, may be some projects needs touch switch.

In this lesson, we will show what is Digital Touch Sensor Module and how to use it with the Arduino board.

HARDWARE

• Osoyoo UNO Board (Fully compatible with Arduino UNO rev.3) x 1
• Breadboard x 1
• Digital Touch Sensor Module x 1
• Jumpers
• USB Cable x 1
• PC x 1

SOFTWARE

Arduino IDE (version 1.6.4+)

About Digital Touch Sensor Module

Overview:

• The module is based on a touch-sensing IC (TTP223B) capacitive touch switch module.
• In the normal state, the module output low, low power consumption; When a finger touches the corresponding position, the module output high, if not touched for 12 seconds, switch to low-power mode
• Jog type : the initial state is low , high touch , do not touch is low ( similar touch of a button feature )
• Module can be installed in such as surface plastic, glass of non-metallic materials. In addition to the thin paper ( non-metallic ) covering the surface of the module , as long as the correct location of the touch , you can make hidden in the walls, desktops and other parts of buttons

Features:

• Low power consumption
• Power supply for 2 ~ 5.5V DC
• Operating Current(Vcc=3V):1.5 – 3.0μA
• Operating Current(VDD=3V):3.5 – 7.0μA
• Can replace the traditional touch of a button
• Four M2 screws positioning holes for easy installation
• Response Time: Low power mode:220ms;Quick mode :60ms
• Size: 8*6*0.5 cm

Specification:

-Control Interface : A total of three pins (GND, VCC, SIG), GND to ground , VCC is the power supply , SIG digital signal output pin ;
-Power Indicator : Green LED, power on the right that is shiny ;
-Touch area : Similar to a fingerprint icon inside the area , you can touch the trigger finger .
-Positioning holes : 4 M2 screws positioning hole diameter is 2.2mm, the positioning of the module is easy to install , to achieve inter- module combination ;

TTP223-IC

TTP223 is 1 Key Touch pad detector IC, and it is suitable to detect capacitive element variations. It consumes very low power and the operating voltage is only between 2.0V~5.5V. The response time max about 60mS at fast mode, 220mS at low power mode @VDD=3V. Sensitivity can adjust by the capacitance(0~50pF) outside.

Applications:

• Water proofed electric products
• Button key replacement
• Consumer products

Example

Connect the Touch Sensor to Your Arduino

Connect Vcc pin of Sensor breakout board to Arduino’s +5V pin and GND to GND. Connect Signal (SIG) pin to Arduino Digital pin D2.

Copy, Paste and Upload the Arduino Sketch

The sketch below provides an output to your serial monitor indicating whether or not the sensor is pressed.

Result

After the uploader , if use finger or metal object touch the metal surface of the transducer , the red LED lights on the UNO will light. Open the Serial Monitor at baudrate 9600, and you will see something as below: