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The MPR121 IC is a great way to build simple capacitive touch interfaces, and now it’s even easier to incorporate into your Arduino projects with the touch shield. The touch shield has 9 capacitive touch pads, with headers for the remaining 3 electrode connections. With this shield you can have a total of 12 touch sensitive buttons. An on-board logic level converter allows it to work with 5V and 3.3V Arduino boards. Simply solder on some header pins and stack it on to your Arduino for a convenient input device. Check below for some example code to get you started.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/1″][vc_tour][vc_tab title=”Key features” tab_id=”1393894407-1-6″][vc_column_text]

1. Supports up to 12 touch electrodes, and close to the detection
2. Operating voltage : 1.71 ~ 3.6 V
3. Very low power, with 29 microamps average supply current;  12 electrodes are used 16ms (62.5Hz) sampling rates
4. Each electrode to achieve continuous, independent automatic calibration
5. Each electrode has a separate contact and release trip thresholds; hysteresis can be set, independent of each electrode
6. Enter the eight electrodes / output logic can be any combination, can drive up to eight LED
7. Maximum shutdown current of 3 μ A
8. I2C interface, using IRQ interrupt output to notify the electrode status changes
9. 3 × 3 × 0.6mm 20-pin QFN package
10. Working temperature: -40 ~ +85 ℃

[/vc_column_text][/vc_tab][vc_tab title=”Hardware preparation” tab_id=”1393894407-2-80″][vc_column_text]Arduino UNO    x1

Touch Shield    x1

Soldering station      x1[/vc_column_text][/vc_tab][vc_tab title=”Welding process” tab_id=”1393894945220-2-0″][vc_column_text]

[/vc_column_text][/vc_tab][vc_tab title=”Test running” tab_id=”1393894946402-3-9″][vc_column_text]（1）put touch shieldn into arduino uno，then supply power to the board

（2）download the code base in attachment，and put into “ arduino-0021/libraries ”：

（3）Open the arduino IDE, followed by clicking“File –> Example –> Touch_Shield_Example”

（4） Download the code to the arduino board and open the serial port (baud rate 9600), touch any key on the shield , we can see the touch keys valuer by monitor:

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touch_shield_sample_code

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