TODO sobre EL SENSOR de PESO con MODULO HX711 , Peso EXACTO con arduno || Tutorial

Summary

In this tutorial, you'll learn how to build a digital weight scale using an Arduino and HX711 sensor. The video covers all the steps, from assembling the hardware components (strain gauge, HX711 module, LCD display) to programming the Arduino. It includes a detailed explanation of the calibration process, where you'll use a known weight to ensure accuracy. With practical examples, the tutorial demonstrates how to measure the weight of various objects, zeroing the scale, and subtracting the weight of containers. By the end, you’ll have a functional, custom-built scale ready for use in projects or industrial processes.

Takeaways

• 😀 Strain gauges change resistance when external force is applied, allowing them to measure weight.
• 😀 The Wheatstone bridge is used to convert the strain gauge’s analog signal into a measurable output.
• 😀 The HX711 module amplifies the low voltage signal from the strain gauge and converts it into a 24-bit digital signal.
• 😀 Arduino is used to process the digital signal from the HX711 and display the weight on an LCD screen.
• 😀 Calibration is necessary to ensure the scale reads accurately, starting with a known reference weight.
• 😀 A button is used to reset the scale to zero, allowing for accurate weight measurement of items placed on the scale.
• 😀 The system can be adapted to various industrial applications, like measuring specific weights for product mixing.
• 😀 The Arduino-based scale provides precise readings compared to standard analog sensors.
• 😀 The HX711 module provides a higher resolution (24 bits) compared to Arduino’s native 10-bit ADC.
• 😀 This project is ideal for building a custom scale for small industrial or personal use, rather than replacing commercial scales.

Q & A

What is the purpose of the weight sensor in this project?

The weight sensor, or strain gauge, is used to measure the weight of an object by detecting the force applied to a bar, converting this force into a measurable voltage change.

What is the role of the HX711 module in the system?

The HX711 module acts as an analog-to-digital converter, amplifying the small voltage signal from the strain gauge and converting it into a digital signal that can be read by a microcontroller.

Why is calibration important for the weight sensor?

Calibration ensures that the weight sensor accurately measures the weight by adjusting the system to account for the base weight of the balance and setting a known reference weight to align the measurements.

How is the calibration process carried out in the project?

The calibration is done by applying a known reference weight (e.g., a 185-gram phone) to the sensor, setting it to zero, and using the system's button to adjust the readings to match the known weight.

What microcontroller is used in this project?

The project uses an Arduino Uno microcontroller to process the data from the HX711 module and display the weight on an LCD screen.

How does the Arduino Uno communicate with the HX711 module?

The Arduino Uno communicates with the HX711 module using two pins: a data pin (Pin 4) and a clock pin (Pin 5), which are responsible for receiving the pulse signals from the module.

What is the function of the zeroing button in the system?

The zeroing button allows the user to remove the weight of the container or base from the measurement, so only the weight of the object inside is displayed.

What type of display is used to show the weight in this project?

The weight is displayed on an LCD screen, which is connected to the Arduino Uno and communicates via the I2C protocol.

What is the significance of the 2 to 2.5 volts power supply in the Wheatstone bridge circuit?

The 2 to 2.5 volts power supply is essential for operating the Wheatstone bridge circuit, providing the necessary voltage to the strain gauges so that the resistance change caused by applied force can be detected and converted into a measurable signal.

How can this project be adapted for industrial applications?

This project can be adapted to industrial applications by integrating it into processes that require precise weight measurements, such as mixing products with specific weight ratios, automatically triggering actions (e.g., closing a silo) when the target weight is reached.