Touch Switch with LED Example

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Touch Switch with LED Example

The EzloPi smart devices provide automation through simple, customizable use with our open-source EzloPi platform, making daily life easier and improving human-machine interactions.

Before moving into this example, it is very important to know about the device registration, provisioning and converting the ESP32 device into an EzloPi device along with knowledge of Web Flasher, MiOS Mobile Application for Android/iOS and the MiOS Web Application.

1. About this example

The following example showcases how we can interface a touch sensor and LED with the EzloPi device and use it as a touch switch.

This setup allows you to use a touch sensor to control the operational state of the LED, providing visible feedback in response to a touch event. We can expand upon this foundation to create more complex and interactive applications with our EzloPi device.

2. Project Demonstration Video

Welcome to the project demonstration video section. The following video showcases the key aspects of Touch Switch with LED Example, providing a visual walkthrough of its implementation.

3. Circuit Diagram & Interface

The following components are required for interfacing with the EzloPi device:

ESP32 as an EzloPi smart device.
TTP223B Touch Sensor.
LED with a current limiting resistor of 82 Ohms value.

The wiring diagram is represented as follows:

The following connections are made in order to complete the entire circuit setup.

From ESP32(30 pins) to TTP223B Touch Sensor:

Connect 3V3 from the ESP32 to the VCC of the sensor.
Connect GND from the ESP32 to the GND pin on the sensor.
Connect D4 from the ESP32 to the SIG Pin on the sensor.

From ESP32(30 pins) to the LED:

Connect the D5 pin from the ESP32 to the LED anode (long leg) through a current limiting resistor of 82 Ohms.
Connect the GND to the cathode (short leg) of the LED.

The wiring diagram of esp32 30pin is represented as follows:

The following connections are made in order to complete the circuit setup.

From ESP32(38 pins) to TTP223B Touch Sensor:

Connect 5V from the ESP32 to the VCC of the sensor.
Connect GND from the ESP32 to the GND pin on the sensor.
Connect the IO4 from the ESP32 to the SIG Pin on the sensor.

From ESP32(38 pins) to the LED:

Connect the D5 pin from the ESP32 to the LED anode (long leg) through a current limiting resistor of 82 Ohms.
Connect the GND to the cathode (short leg) of the LED.

4. Interfacing the Touch Sensor module using EzloPi Web Flasher

1. Set up your device/hardware by visiting config.ezlopi.com

Now click on Connect Device and a pop-up window will appear

Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect.

If you are new to this and it’s your first time configuring, select Create new Device ID. Enter Wifi SSID and Wifi Password.
In the Device Configuration, tab click on Other.

A Digital Output window will open for inputting the following parameters:

Set a device name of your choosing. In our case, we set it to Touch Switch.
Set Device subtype to LED.
Set OUT GPIO to 4.
Set Resistor to PULL UP.
Set the default value to LOW.
Check the Button Enable box.
Set INP GPIO to 5.
Set Resistor to PULL DOWN.
Set the default value to LOW.
Now Click the Apply button.
After clicking the apply button you can see a table of your setting in the device configuration tab.
Press the Flash Device button.

A window will appear on the bottom right side of the screen displaying “Please press BOOT button while flashing begins.”

Hold the BOOT button down until the next window appears on the bottom right side of the screen which says “Installation prepared. Please release the boot button now.”

Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.

After some time, a popup will appear saying Device Flashed Successfully! This means that your device has been set up successfully.

5. MiOS App

You can download the MIOS Android app from the Google Play Store and Apple App Store.

After downloading the app, proceed to install the application and open it.

Using the MIOS mobile application, create a new Ezlo Cloud account using the sign-up option. If you already have an account, you may proceed to log in.

After successfully logging in, you will be able to see the number of controllers connected such as a lamp, fan, or any other device in the MiOS app. Tap on any controller of your desired ID:

You will be able to see the status of your controller whether it is online or offline. Access the device dashboard, and tap the device. The following view of the dashboard will appear:

After opening the MiOS mobile dashboard, you will be able to see the tile of your connected device. The touch sensor module works as a switch, the state of the LED is controlled by touching the sensor module.
When a touch is detected by the sensor, the LED will turn ‘ON’ and remain ‘ON’ until another touch input is not detected by the sensor.

Similarly, when another touch is detected by the sensor, the LED will turn ‘OFF’ and remain ‘OFF’ until another touch is not detected as shown above.

6. MiOS Web Application

After configuring the controller with the EzloPi web flasher, head to ezlogic.mios.com

Use the same credentials to log in that you used for configuring the controller with the web flasher.

After opening the web dashboard, you will be able to see the tile of your connected device. The state of the LED is controlled by touching the sensor module.
When a touch is detected by the sensor, the LED will turn ‘ON’ as can be seen above on the web dashboard and will remain ‘ON’ until another touch input is not detected by the sensor.