Dynamic temperature control and device monitoring

Smart home management with EzloPi

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Dynamic temperature control and device monitoring

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 project focuses on dynamic temperature control and device monitoring using the DS18B20 temperature sensor and a voltage sensor module interfaced with the EzloPi device. The DS18B20 provides real-time temperature data, while the voltage sensor monitors the power supply which is the battery in this case. Based on temperature readings, a 5V DC fan is turned on to maintain optimal conditions. The EzloPi device acts as the central controller, processing sensor inputs and triggering actions. This setup enables efficient cooling, temperature regulation, and power monitoring, making it ideal for smart environments and device management systems.

3. Circuit Diagram & Interface

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

ESP32 as an EzloPi smart device.
DS18B20 temperature Sensor.
Voltage sensor module.
XY-MOS, high-power dual MOSFET driver module.
5V DC Fan.
3.7V battery

The wiring diagram of ESP32 30 pin is represented as follows:

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

From ESP32 to the DS18B20:

ESP32	DS18B20
3V3	VIN
GND	GND
D15	S (Signal)

From ESP32 to the Voltage sensor:

ESP32	Voltage sensor
VIN	+ (VCC)
GND	- (GND)
D33	S (Signal)

From Voltage Sensor to Battery:

Voltage sensor	Battery
VCC	+ (VCC)
GND	- (GND)

From ESP32 to the MOSFET driver module:

ESP32	MOSFET driver
D22	Trig
VIN	VIN+
GND	GND, VIN-

From MOSFET driver module to Fan:

MOSFET Driver	Fan
OUT+	5V
OUT-	GND

4. Interfacing the Temperature sensor, voltage sensor module and fan using the EzloPi Web Flasher:

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

Now, click on the Connect Device button 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 One Wire.

A One Wire window will be opened for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to DS18B20.
Set the GPIO to 15.
Set Device subtype to DS18B20 Temperature Sensor.
Then Click Apply Button.

Again, In the Device Configuration, tab click on Analog Input.

An Analog Input window will be opened for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to Voltage Sensor.
Set the Device Subtype to Shunt Voltmeter.
Set the ADC input pin to 33.
Set the Resolution to 10-bit.
Then Click Apply Button.

Again, In the Device Configuration, tab click on Digital Output

A Digital Output window will be opened for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to the Fan.
Set Device Subtype to LED.
Set the OUT GPIO to 22.
Set the Resistor to PULL UP.
Then Click 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 Web Dashboard

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.

Here, on the MiOS web dashboard, you will be able to see the tiles of connected devices. In our case, we have a voltage sensor, DS18B20 and Fan tiles. The fan tile will depend on the output of the DS18B20 temperature sensor whether or not the sensor’s value is within the set temperature threshold while the voltage sensor indicates the battery voltages connected to our project setup.

MeshBots:

On the left side of the screen under Automation, click on MeshBots.
On meshbot screen, click on Create new MeshBot button present on the top right corner of the screen.
After clicking on Create new MeshBot, you will see this now under Automation MeshBot click on EzloPi.

On the next screen you will see that we can create a name of our choosing, in this case we write it as Test016.

In the trigger tab you can set the TRIGGER for your device and in the ACTION tab you can set the action to be performed based on the trigger which you have created.

Set these things in TRIGGER section:

Set Node Type to Device.
Set the Node to DS18B20.
Set the Capability to Temp.
Set the Comparator to Greater(>).
Set the Value Type to value.
Set the Value to 30.

Set these values in the True part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to Fan.
Set the Capability to switch.
Set the Value to true.

Set these values in the False part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to Fan.
Set the Capability to switch.
Set the Value to false.
Now Click the Save button.

After clicking the save button you can see this screen on the top right corner of the screen.

Here you can see your saved MeshBot. Now click on Dashboard.

Now in the MiOS web dashboard, we can see that when the temperature sensor temperature is within our limit, the fan is OFF according to the condition set in the meshbot while voltage sensor shows no power is being used and battery is at its full capacity.

Here in the above picture, it shows that when the temperature measures a relatively high value and is out of our range then the fan turns ON because of our meshbot settings while the voltage sensor also shows that battery power is being consumed.

6. 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:

On the MiOS mobile app, we can see that when the temperature sensor temperature is within our limit, the fan is OFF according to the condition set in the meshbot while voltage sensor shows no power is being used and battery is at its full capacity.

Here in the above picture, it shows that when the temperature measures a relatively high value and is out of our range then the fan turns ON because of our meshbot settings while the voltage sensor also shows that battery power is being consumed.