DMS load cell with measuring amplifier HX711AD - Versionsgeschichte

Onyesi-john.abiagam@stud.hshl.de: /* Related Links */

2026-04-23T11:42:27Z

Onyesi-john.abiagam@stud.hshl.de: /* Related Links */

2026-04-23T11:42:01Z

Onyesi-john.abiagam@stud.hshl.de: /* Microcontroller Peripherals */

2026-04-23T11:36:10Z

Microcontroller Peripherals

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	\| Buzzer \|\| Acoustic feedback \|\| Digital Output \|\| Indicates stable measurement		\| Buzzer \|\| Acoustic feedback \|\| Digital Output \|\| Indicates stable measurement
	\|-		\|-
	\| Push Button (Power) \|\| System control \|\| Interrupt Pin (~~e.g., D2~~) \|\| Starts or stops the system		\| Push Button (Power) \|\| System control \|\| Interrupt Pin (D3) \|\| Starts or stops the system
	\|-		\|-
	\| Push Button (Tare) \|\| Reset function \|\| Interrupt Pin (~~e.g., D3~~) \|\| Resets measured value to 0 g		\| Push Button (Tare) \|\| Reset function \|\| Interrupt Pin (D2) \|\| Resets measured value to 0 g
	\|}		\|}

Onyesi-john.abiagam@stud.hshl.de: /* HX711 to Microcontroller */

2026-04-23T11:35:03Z

HX711 to Microcontroller

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	! HX711 Pin !! Function !! Microcontroller Pin !! Description		! HX711 Pin !! Function !! Microcontroller Pin !! Description
	\|-		\|-
	\| VCC \|\| Power Supply \|\| 5V ~~/ 3.3V~~ \|\| Power input		\| VCC \|\| Power Supply \|\| 5V \|\| Power input
	\|-		\|-
	\| GND \|\| Ground \|\| GND \|\| Common reference		\| GND \|\| Ground \|\| GND \|\| Common reference

Onyesi-john.abiagam@stud.hshl.de: /* Working Principle */

2026-04-23T11:30:23Z

Working Principle

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	* It processes this raw value using calibration parameters (offset and calibration factor) to compute the weight in grams.		* It processes this raw value using calibration parameters (offset and calibration factor) to compute the weight in grams.
	* It applies a digital filter (recursive average) to smooth the measurement and calculates the moving standard deviation to assess stability.		* It applies a digital filter (recursive average) to smooth the measurement and calculates the moving standard deviation to assess stability.
	* Based on the stability result, the Arduino activates the buzzer (by generating a 1 kHz square wave) and updates the LCD display via the ~~I2C~~ bus.		* Based on the stability result, the Arduino activates the buzzer (by generating a 1 kHz square wave) and updates the LCD display via the I²C bus.
	* It continuously monitors two pushbuttons connected to interrupt pins:		* It continuously monitors two pushbuttons connected to interrupt pins:
	* Power button: toggles the system on/off		* Power button: toggles the system on/off

Onyesi-john.abiagam@stud.hshl.de: /* Required Components */

2026-04-23T11:29:35Z

Required Components

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	\| Central control unit that reads sensor data, processes signals, and controls peripherals such as the display, pushbutton, and buzzer		\| Central control unit that reads sensor data, processes signals, and controls peripherals such as the display, pushbutton, and buzzer
	\|-		\|-
	\| LCD Display (~~I2C~~)		\| LCD Display (I²C)
	\| Displays the measured weight		\| Displays the measured weight
	\|-		\|-

Onyesi-john.abiagam@stud.hshl.de: /* LCD (I2C) */

2026-04-23T11:29:01Z

LCD (I2C)

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	== LCD (I<sup>2</sup>C) ==		== LCD (I<sup>2</sup>C) ==

	The system uses a 16×2 character LCD with an ~~I2C~~ (Inter-Integrated Circuit) backpack. The I2C interface reduces the number of required microcontroller pins from 6 (parallel mode) to only 2: SDA (data) and SCL (clock). The backpack contains a PCF8574 I/O expander that converts I2C commands into parallel signals for the LCD.		The system uses a 16×2 character LCD with an I²C (Inter-Integrated Circuit) backpack. The I2C interface reduces the number of required microcontroller pins from 6 (parallel mode) to only 2: SDA (data) and SCL (clock). The backpack contains a PCF8574 I/O expander that converts I2C commands into parallel signals for the LCD.

	=== I<sup>2</sup>C Working Principle ===		=== I<sup>2</sup>C Working Principle ===

	* The microcontroller sends a byte sequence over the ~~I2C~~ bus.		* The microcontroller sends a byte sequence over the I²C bus.
	* Each byte contains either a command (e.g., clear display, set cursor) or a character to display.		* Each byte contains either a command (e.g., clear display, set cursor) or a character to display.
	* The PCF8574 outputs the corresponding parallel data and control signals (RS, EN, RW, D4–D7) to the LCD.		* The PCF8574 outputs the corresponding parallel data and control signals (RS, EN, RW, D4–D7) to the LCD.
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	In this project, the LCD displays the current filtered weight in grams and a stability indicator ("Stable" / "Unstable").		In this project, the LCD displays the current filtered weight in grams and a stability indicator ("Stable" / "Unstable").
	[[Datei:LCD HD44780.jpg\|thumb\|right\|Figure 6: ~~I2C~~ LCD Module.<ref>Source: HSHL Wiki – LCD HD44780 image, https://wiki.hshl.de/wiki/index.php/Datei:LCD_HD44780.jpg</ref>]]		[[Datei:LCD HD44780.jpg\|thumb\|right\|Figure 6: I²C LCD Module.<ref>Source: HSHL Wiki – LCD HD44780 image, https://wiki.hshl.de/wiki/index.php/Datei:LCD_HD44780.jpg</ref>]]
	<div style="clear: both;"></div>		<div style="clear: both;"></div>

Onyesi-john.abiagam@stud.hshl.de: /* Arduino IDE */

2026-04-23T11:27:23Z

Arduino IDE

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	* HX711.h – for communicating with the HX711 amplifier.		* HX711.h – for communicating with the HX711 amplifier.
	* LiquidCrystal_I2C.h – for the ~~I2C~~ LCD display.		* LiquidCrystal_I2C.h – for the I²C LCD display.

	=== Arduino Implementation ===		=== Arduino Implementation ===

Onyesi-john.abiagam@stud.hshl.de: /* Circuit Description */

2026-04-23T11:26:57Z

Circuit Description

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	* The HX711AD is powered by the microcontroller and shares a common ground with all components.		* The HX711AD is powered by the microcontroller and shares a common ground with all components.
	* The HX711AD transmits digital measurement data to the microcontroller via the DOUT and PD_SCK pins.		* The HX711AD transmits digital measurement data to the microcontroller via the DOUT and PD_SCK pins.
	* The LCD is connected to the microcontroller via the ~~I2C~~ interface (SDA and SCL).		* The LCD is connected to the microcontroller via the I²C interface (SDA and SCL).
	* A buzzer is connected to a digital output pin to provide feedback sound.		* A buzzer is connected to a digital output pin to provide feedback sound.
	* Two push buttons are connected to interrupt-capable pins:		* Two push buttons are connected to interrupt-capable pins:

Onyesi-john.abiagam@stud.hshl.de: /* Components */

2026-04-23T11:26:36Z

Components

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	* HX711AD measuring amplifier		* HX711AD measuring amplifier
	* Microcontroller (Arduino Uno R3)		* Microcontroller (Arduino Uno R3)
	* LCD (~~I2C~~)		* LCD (I²C)
	* Buzzer		* Buzzer
	* Push button (power)		* Push button (power)
	* Push button (tare)		* Push button (tare)
	* Breadboard		* Breadboard
	* Jumper wires		* Jumper wires


	=== Circuit Description ===		=== Circuit Description ===

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	= Related Links =		= Related Links =
	*[https://wolles-elektronikkiste.de/hx711-basierte-waage HX711 based weight scale]		*[https://wolles-elektronikkiste.de/hx711-basierte-waage HX711 based weight scale]
	*[https://wiki.hshl.de/wiki/index.php/~~LCD_Modul_16x02_I²C~~ LCD Modul 16x02 ~~I²C~~ (HSHL Wiki)]		*[https://wiki.hshl.de/wiki/index.php/LCD_Modul_16x02_I2C LCD Modul 16x02 I2C (HSHL Wiki)]
	*[https://learn.sparkfun.com/tutorials/getting-started-with-load-cells Getting Started with Load Cells – SparkFun]		*[https://learn.sparkfun.com/tutorials/getting-started-with-load-cells Getting Started with Load Cells – SparkFun]
	*[https://justdoelectronics.com/load-cell-hx711-module/ Load Cell with HX711 Module – Tutorial]		*[https://justdoelectronics.com/load-cell-hx711-module/ Load Cell with HX711 Module – Tutorial]

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	= Related Links =		= Related Links =
	*[https://wolles-elektronikkiste.de/hx711-basierte-waage HX711 based weight scale]		*[https://wolles-elektronikkiste.de/hx711-basierte-waage HX711 based weight scale]
	*[https://wiki.hshl.de/wiki/index.php/~~LCD_Modul_16x02_I2C~~ LCD Modul 16x02 ~~I2C~~ (HSHL Wiki)]		*[https://wiki.hshl.de/wiki/index.php/LCD_Modul_16x02_I²C LCD Modul 16x02 I²C (HSHL Wiki)]
	*[https://learn.sparkfun.com/tutorials/getting-started-with-load-cells Getting Started with Load Cells – SparkFun]		*[https://learn.sparkfun.com/tutorials/getting-started-with-load-cells Getting Started with Load Cells – SparkFun]
	*[https://justdoelectronics.com/load-cell-hx711-module/ Load Cell with HX711 Module – Tutorial]		*[https://justdoelectronics.com/load-cell-hx711-module/ Load Cell with HX711 Module – Tutorial]