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Information

The Onboard Touch Sensor of the IoT Proto Shield Plus

Published : 03/25/2022 08:46:46
Categories : IoT Proto Shield Plus , Proto Shield Plus


The on-board TOUCH SENSOR of the IoT Proto Shield Plus

The touch sensor on the IoT Proto Shield Plus uses the TTP223E chip, which is the same used on the touch boards of widespread use.


TOUCH Section of the IoT Proto Shield Plus
TOUCH section of the IoT Proto Shield Plus

TOUCH section of the IoT Proto Shield Plus


Schematic of the IoT Proto Shield Plus TOUCH Section
Schematic of the TOUCH section of the IoT Proto Shield Plus


Default connections


Default connection of the TOUCH section of the IoT Proto Shield Plus

Please note that there are no default connections for the ESP8266. If you need to use the TOUCH with ESP8266 boards, you need to route the signals with jumper wires.

Suggested ESP8266 connections


The sample sketches are made to work with these connections:
ESP8622 GPIO 14 (D5) connected to header J3 ESP32 GPIO32 (TOUCH)

Suggested connections to work with TOUCH and ESP8266


Sample Sketches


Download the sample sketches by clicking here.

Location: IoTPSP_Sample_Sketches/IoTPSP_TOUCH

Use the IoTPSP_TOUCH_NANO sketch to test the TOUCH with ARDUINO NANO boards.
Use the IoTPSP_TOUCH_ESP32 sketch to test the TOCUH with ESP32 boards.
Use the IoTPSP_TOCUH_ESP8266 sketch to test the TOCUH with ESP8266 boards.

Put your finger on the touch circles and the GRN led will turn on according to your touch.

ESP32 also have internal touch sensors, so with ESP32 boards, you can bypass the TTP223E chip and work directly with the internal sensor connected to GPIO32 (TOUCH9).

To setup the board to work with ESP32 internal touch sensor, you need to OPEN JP22 (cut it in the middle), CLOSE JP25 pad 3 and pad 2 (connect them with a little drop of tin) and OPEN pad 1 and 2 (cut between the pads).
Use the IoTPSP_TOUCH_ESP32_INTERNAL sketch to test the TOUCH section with ESP32 boards.
Use serial monitor to check the internal touch sensor value.


Using TOUCH with different GPIO pins

According to the above schematics, TOUCH is routed to the default GPIO pin by means of JP3.
To disconnect TOUCH from its default GPIO pin, you must OPEN JP3 (cut it in the middle).
Solder a header on J43 and, by means of some jumper wires, connect it to another GPIO pin according to your needs.
Please check the default signal routing of the IoT Proto Shield Plus to  avoid conflict with other default connections.

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