Grove - Touch Sensor

Introduction

Grove - Touch Sensor enables you to replace press with touch. It can detect the change in capacitance when a finger is near by. That means no matter your finger directly touches the pad or just stays close to the pad, Grove - Touch Sensor would outputs HIGH also.

Specifications

• Operating Voltage: 2.0 - 5.5V
• Operating Current(Vcc=3V):1.5 - 3.0μA
• Operating Current(VDD=3V):3.5 - 7.0μA
• Output Response Time: 60 - 220mS
• Used Chipset: TTP223-BA6

Platforms Supported

Option features

AHLB	TOG	LPMB	MOTB	SLRFTB	RST	Q	OPDO
Output Active High / Low	Toggle mode	Power Mode	Max. On Time	Sampling length	RESET PIN	CMOS Output	Open Drain Mode
V	V	0	1	1	X	V	X
Active High	Disabled	LOW	Infinite	1.6 msec	N/A	Present	N/A

Demonstration

With Arduino

This demo is going to show you how to turn on/off an LED.

Demo Code:

const int TouchPin=9;
const int ledPin=12;

void setup() {
    pinMode(TouchPin, INPUT);
    pinMode(ledPin,OUTPUT);
}

void loop() {
    int sensorValue = digitalRead(TouchPin);
    if(sensorValue==1)
    {
        digitalWrite(ledPin,HIGH);
    }
    else
    {
        digitalWrite(ledPin,LOW);
    }
}

With Raspberry Pi

1. You should have a raspberry pi and a grovepi or grovepi+.
2. You should have completed configuring the development environment, otherwise follow here.

3. Connection

   • Plug the sensor to grovepi socket D4 by using a grove cable.

4. Navigate to the demos’ directory:

    cd yourpath/GrovePi/Software/Python/

• To see the code

    nano grove_touch_sensor.py   # "Ctrl+x" to exit #

    import time
    import grovepi

    # Connect the Grove Touch Sensor to digital port D4
    # SIG,NC,VCC,GND
    touch_sensor = 4

    grovepi.pinMode(touch_sensor,"INPUT")

    while True:
        try:
            print grovepi.digitalRead(touch_sensor)
            time.sleep(.5)

        except IOError:
            print "Error"

5.Run the demo.

    sudo python grove_touch_sensor.py

Resources

• Eagle Files
• TTP223pdf

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