Wi-Fi touch sensor

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: Wi-Fi touch sensor

URL: https://docs.leafony.com/en/examples/advanced/esp32-mcu/esp32/wifi_touchsensor/

Description / headings (excerpt): Overview / Leaf to use / Assembly / Pin assignment

Overview

When shipped from the factory, Arduino sketches are written on the ESP32 MCU leaf, so the touch sensor values can be sent via Wi-Fi from a smartphone or PC, and the display will appear.

Leaf to use

Use the following leaves.

Type	Name	Q’ty
AP02	ESP32 MCU	1
AV04	2V~4.5V	1
AX07	Back to back	1
AX08	29pin header	1
AZ62	Connector Cover	2
AZ63	Nut Plate	2
	AAA battery holder	1
	AAA battery	3
	M2*15mm screw	4
	φ10x2mm magnet	1

Assembly

Assemble the leaves as shown in the figure below.

assemble1

Pin assignment

Refer to the figure below for the pin assignment of each leaf.

Source code

The sketch to be used can be found in the GitHub repository below.

Leafony/Sample-Sketches/ESP32_AP_Touch - GitHub

Execution method

Insert three AAA batteries into the ESP32 Wi-Fi Kit and turn on the power switch.
Search for nearby Wi-Fi networks on your PC, smartphone or tablet, and connect to the following network.
- SSID: Leafony_ESP32-AP
- Password: password
Launch a web browser on your PC or smartphone and go to http://192.168.4.1.
Pins 7, 9, 22, 24, 26, and 28 of the 29-pin header are assigned to the touch sensor.
When the pin is touched, the capacitance increases and the value decreases. When the value is 20 or lower, “Touch detected” is displayed.
(Pin 24 is hidden in the sample sketch because it interferes with the RTC & microSD. The detection threshold can be changed in the sketch. In the following picture, I am touching pin 26 with my fingertip.)

Touching pin 26

When you touch pin 26, the browser display will change as shown below.

The ESP32 Wi-Fi Kit has a magnet attached to its Nut Plate. Try mounting it on a metal wall or another metal surface.