Calibration of ADXL335 Gesture Recognition Sensor interfaced with 8051

ADXL is an accelerometer sensor used to take a signal based on human gestures, it needs a calibration to adjust in order to get a signal from sensor for different motions. In this article we are going to discuss about calibration process using 8051 microcontroller.

In 8051/52 architecture doesn’t have Analog to Digital converter, so need to interface an ADC feature to your circuit. LM324 is an OpAmp based comparator IC, which can convert analog voltage to digital.


LM324 has four OpAmp, so that this IC can able to convert signals from four sensors. OpAmp has two input pins – Inverting Pin (-) and Non Inverting Pin (+). Where Signal of ADXL sensor have to connect with Inverting Pin and a Potentiometer with Non Inverting pin to set a reference voltage.


Connect ADXL X axis pin with OpAmp 3,4 and Y axis to OpAmp 1 and 2. Hold the sensor in straight position and calibrate for that condition as 0101 using POT and LED’s. Once this calibration is done, you can get the values for other movements also.


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What is IoT? How it works?

Internet of Things, in short IoT, is an upcoming technology that transforms everyday objects into an ecosystem that would enrich our lives and make it simpler. IoT is the latest technology that can transform any electronic device into a smarter one. IoT uses the power of data and provides valuable insights to the users which can be used to improve operational efficiency and productivity.

From washing machines, ventilators, TV systems to vehicle garages, everything can be transformed into a smarter device with the help of IoT. IoT technology is bringing a large number of day-to-day objects into the digital fold to make us live our lives smarter and more efficiently.

Which are the components that makes IoT efficient?

IoT system has the following components which make it work more efficient:

Microcontroller: This acts as the brain of the system and processes the data received from the sensor. You can program the microcontroller to carry out specific functionalities. The most commonly used microcontrollers are Arduino Uno & Raspberry Pi

Sensors: These are electrical devices that can monitor specific values real-time. For example, DHT (Digital Humidity and Temperature) sensor tracks the temperature and humidity differences in the environment in real-time and sends the data to the microcontroller. Other sensors include LDR (Light Dependent Resistor), Soil Moisture Sensor, PIR (Passive Infra-Red) sensor, Water Flow sensor, etc,

WiFi Module: This facilitates the connection between the device and the cloud platform. The data will be sent to the cloud platform with the help of this module. The most commonly used WiFi module is ESP-8266. Since Raspberry Pi has an inbuilt WiFi module, you don't require an additional one to establish the connection.

Cloud Platform: The feature that differentiates IoT from other technologies is the way the data is handled. IoT facilitates the transfer of data onto the cloud for storage and analysis with ease. For this, you need to link the project with any cloud platform. ThinkSpeak IoT platform is the most commonly used cloud platform.

Actuators: These are the devices that perform a specific action upon receiving the commands from the microcontroller. Actuators like water pumps, relay driver modules, and DC motors carry out variations actuations like irrigating a field, switching ON/OFF of devices, etc upon programming.

Also read:
Latest IoT Projects
Good IoT based Projects for Engineering Students

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What is a IoT based Project?

IoT, the Internet of Things is transforming the way we live our lives. From homes, offices, streets to cities, everything is being transformed to become smarter. Even the simplest electronics devices are being made smarter by integrating them with IoT. Since IoT enables the data transfer to the cloud, the technology provides valuable insights to make the devices more efficient and productive.

In short, IoT is an integrated technology that offers a platform where large amounts of data collected from various resources can be stored and analyzed. This is highly important for industries to implement in their operations as it greatly assists them to make the right and efficient decisions.

What are the components of IoT?

IoT technology requires a microcontroller to process the data, WiFi integration to send data to the cloud, and actuators to control operations. The data collected and sent will be stored in the cloud platform for later analysis. This data can be accessed by any user from any part of the world to get valuable insights.

Also read:
Latest IoT Projects
Good IoT based Projects for Engineering Students

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