In order to reduce the number of false positives - we've include a software debounce with a 200ms window, which you can change in the config file. The component purchase link is given below. You can download the Gerber file and order the PCB online from NextPCB.

A hall effect sensor is much smaller, but can handle less current than a reed switch. You can even use it for things like Rain Gauges or Pulse Flow Meters. The code can be directly uploaded to the NodeMCU Board.

But my OLED not display anything If you haven't used a … To get better precision of more than 10%, a lot of calibration is required. But now let us see the IoT Water Flow Meter Circuit Diagram & Connection. (adsbygoogle = window.adsbygoogle || []).push({}); In this project we will learn how to make IoT Based Water Flow Meter using ESP8266 & Water Flow Sensor. I used an A3144 Hall effect sensor that outputs a low state whenever the north pole of a magnet is close. It has built in Wifi and is compatible with the Arduino IDE. For example: If you have a latched digital type sensor that reacts to the north pole of a magnet and you move a magnet’s north pole close to the sensor, it’ll pull the output high and will remain in that state until you bring the other pole of the magnet close to the sensor. 1 year ago The digital types output a high signal when a certain condition is met while the analog sensing devices output a voltage proportional to the magnitude of the magnetic field: Some sensors have a built-in latch that retains a state until the magnetic field is reversed. Each pulse is approximately 2.25 milliliters. Now let us interface YF-S201 Hall-Effect Water Flow Sensor with Nodemcu ESP8266 & OLED Display. Below is the front view and Back View of the PCB generated from Gerber Viewer of NextPCB.

#define SCREEN_WIDTH 128    // OLED display width, in pixels, #define SCREEN_HEIGHT 64    // OLED display height, in pixels, #define OLED_RESET -1       // Reset pin # (or -1 if sharing Arduino reset pin), // Enter your Write API key from ThingSpeak, // replace with your wifi ssid and wpa2 key, //initialize with the I2C addr 0x3C (128x64), // Because this loop may not complete in exactly 1 second intervals we calculate, // the number of milliseconds that have passed since the last execution and use, // that to scale the output.

Litres = (Frequency (Pulses/second) / 7.5) * time elapsed (seconds) / 60 The nodeMCU uses the ESP8266 Chip from Espressif. I have a question, I have done exactly the same, but I see that on some occasions the esp8266 freezes (and strange characters start to appear through the serial monitor) and I see that it works again when I disconnect the flow sensor, and being connected to it and it works perfectly. In this article, I’ll discuss what Hall effect sensors are and how you can use one to build a simple device that will sense whether a door is opened or closed and that can be accessed via your home network to check its state.

Check the SDA & SCL connection of OLED with Nodemcu board. Copy the API Key.

Once the first test was successful, I wrote the firmware for the device.

I have assembled the circuit on Breadboard. The OLED Display will show Water Flow Rate & Total Volume of Water passed through the pipe. To find to wind direction, we will make an optical encoder based on led and phototransistors. We will display the water flow rate & Total Volume in 0.96″ OLED Display.

As mentioned before, the sensor, I used, is a digital type without a latch. However, don’t forget to configure the GPIO pin, you want to use, to utilize the internal pull-up resistor before assigning the interrupt event. Following are the components required for making this project. Battery Powered Lamp That Turns on Through the Use of Magnets. Step 2: Create a New Channel by Clicking on “Channel” & fill up the following details as shown in the image below. Hall effect sensors can be used to measure the strength of a magnetic field. This is very important, it will be required in Code Part. The PCB quality are clean and brilliant. So you can change the sensor to another switch, like a reed switch or push button and the code will continue to work. We'll be using the library to manage the wifi and service connections. This tutorial will show you how to use NodeMCU with an AH180 Hall Effect Sensor for transmitting data to the service. Some oled have different I2C address than 0×3C. The digital hall effect sensor that we've used essentially behaves like a switch.

In your Arduino IDE, go to File > Examples > ESP32 > HallSensor sketch: // Simple sketch to access the internal hall effect detector on the esp32. Read Hall Effect Sensor – Arduino IDE.

Here is the final board. Litres = Pulses / (7.5 * 60).

Refer to your component’s datasheet for details. Hall Sensor Tutorial for Arduino, ESP8266 and ESP32 In this tutorial we cover the Hall Sensor, a sensor to measure magnetic fields. To set up Thingspeak follow the following Steps: Step 1: Visit and create your account by filling up the details. Hello, I have tried and it works, thank you @ Mr Alam. We share news, articles, projects, and circuits in various electronics domains such as Embedded, Power, Analog, Digital, Audio, IoT, etc thus helping our readers with their projects and work.

Change the Thingspeak API Key, Wifi SSID & Password from the line above. 3. The data is recorded and saved there which can be exported to excel. Use version 2.5.0 of the ESP8266 Arduino package to avoid a bug that occurs when executing a sketch with interrupts. Some include - checking a door/gate is open or closed, if the water level on a tank is low. The same Flow Rate & Volume data can be sent to Thingspeak Server after an interval of 15 seconds regularly. Water management involves supplying water according to the real requirement & without wasting Water. Without measuring these parameters, Water Management is almost impossible. The nodeMCU uses the ESP8266 Chip from Espressif. Share it with us!


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