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ESP8266 NodeMCU Interface – ADXL345

The ESP8266 NodeMCU is a popular development board based on the ESP8266 microcontroller, which offers built-in Wi-Fi capabilities, making it ideal for Internet of Things (IoT) projects. In this project, we’ll explore how to interface the ESP8266 NodeMCU with the ADXL345 accelerometer sensor.

Read more: ESP8266 NodeMCU Interface – ADXL345

ADXL345

The ADXL345 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. It’s suitable for various applications, including tilt sensing, motion detection, and vibration monitoring.

By combining the ESP8266 NodeMCU with the ADXL345 sensor, we can create IoT applications that can monitor and analyze motion or vibrations remotely over Wi-Fi. This interface allows us to gather data from the accelerometer sensor and transmit it to a server, cloud platform, or display it on a web page.

Throughout this project, we’ll cover the hardware setup, including connecting the ADXL345 sensor to the ESP8266 NodeMCU, and the software implementation, which involves programming the ESP8266 NodeMCU to communicate with the ADXL345 sensor and transmit the data. With this interface, you’ll be able to leverage the power of the ESP8266 NodeMCU and the capabilities of the ADXL345 sensor to create versatile IoT applications for motion sensing and monitoring.

Code

Make sure you have the necessary libraries and setup to run this code on your hardware.

-- www.ArunEworld.com 
sda = 2 -- GPIO-4 
scl = 1 -- GPIO-5 

print("ArunEworld")

-- Initialize the ADXL345 sensor
adxl345.init(sda, scl)

-- Delay for 3000000 microseconds (3 seconds)
tmr.delay(3000000)

-- Read data from the ADXL345 sensor
print(adxl345.read())

-- Define a function to read accelerometer data
function ADXL_read() 
    -- Read accelerometer data
    local x, y, z = adxl345.read() 
    -- Print accelerometer data
    print("X-axis:", x)
    print("Y-axis:", y)
    print("Z-axis:", z)
    -- Alternatively, you can print all axes at once using the following line:
    -- print(string.format("X = %d, Y = %d, Z = %d", x, y, z))
end 

-- Set up a timer to call the ADXL_read function every 1000 milliseconds (1 second)
tmr.alarm(0, 1000, tmr.ALARM_AUTO, ADXL_read)

Code Explanation

LineCodeExplanation
1sda = 2Assigns pin 2 to the variable sda, representing the Serial Data (SDA) pin.
2scl = 1Assigns pin 1 to the variable scl, representing the Serial Clock (SCL) pin.
4print("ArunEworld")Prints the message “ArunEworld” to the console.
7adxl345.init(sda, scl)Initializes the ADXL345 sensor with the SDA and SCL pins defined earlier.
10tmr.delay(3000000)Delays the execution of the program for 3 seconds (3000000 microseconds).
13print(adxl345.read())Reads data from the ADXL345 sensor and prints it to the console.
16function ADXL_read() ... endDefines a function named ADXL_read to read accelerometer data from the ADXL345 sensor.
19tmr.alarm(0, 1000, tmr.ALARM_AUTO, ADXL_read)Sets up a timer to call the ADXL_read function every 1000 milliseconds (1 second) repeatedly.

NEXT

NodeMCU Get Start
NodeMCU Build Firmware
NodeMCU Flash Firmware
NodeMCU IDE
ESP8266 NodeMCU Modules
NodeMCU Module–Firmware Info
NodeMCU Module – GPIO
NodeMCU Module – Node
NodeMCU Module – WiFi
NodeMCU Module – Timer
NodeMCU Module – I2C
NodeMCU Module – File
NodeMCU Module – NET
NodeMCU Module – HTTP
NodeMCU Module – MQTT
ESP8266 NodeMCU Interface
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NodeMCU Interface Button
NodeMCU Interface 7 Seg
NodeMCU Interface LCD
NodeMCU Interface ADC
NodeMCU Interface DHT11
NodeMCU Interface MCP23008
NodeMCU Interface MCP23017
NodeMCU Interface ADXL345
NodeMCU Interface DS18B20
ESP8266 NodeMCU Tutorials
NodeMCU Tutorials Google Time
NodeMCU Tutorials WebServer
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