Potentiometer

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Smart Potentiometer

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

IIn this example, the simple interfacing of a smart potentiometer is demonstrated. A potentiometer is an adjustable electrical resistor which provide analog input control.

Once connected to an EzloPi device, the potentiometer’s analog output can be utilized in several ways. For instance, you can use it to control the brightness of lights by mapping the potentiometer’s output voltage to the desired range of light intensity. Similarly, you can adjust the volume of audio devices, set the position of servo motors, or calibrate sensor values based on the potentiometer’s output.

2. Project Demonstration Video

Welcome to the project demonstration video section. The following video showcases the key aspects of Smart Potentiometer, providing a visual walkthrough of its implementation.

3. Circuit Diagram & Interface – ESP32 Smart Potentiometer

The following components are required for interfacing the ESP32 potentiometer using the EzloPi device:

ESP32 as EzloPi smart device.
Potentiometer (Value =5kΩ (5000Ohm))

The wiring diagram is represented as follows:

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

From ESP32 to the Smart Potentiometer:

Connect the 5V pin to the first pin of the potentiometer.
Connect the IO33 pin from the ESP32 to the second pin, which is the output/VOUT pin.
Connect the GND from the ESP32 to the GND pin.

4. Interfacing the Potentiometer using EzloPi Web Flasher

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 Analog input.

A pop up window will open for inputting the following parameters.

Set a device name of your choosing. In our case we set it to Pot.
Select the device subtype to Smart Potentiometer.
Set ADC Input Pin to 33.
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 left 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 left 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 this 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 dashboard, you will be able to see the tile of your connected device.
Here as you can see in the above, we can see the Pot tile. When the smart potentiometer or pot is rotated, it’s current value is being reflected on the dashboard tile.