#HX711 Module

[jayakody2000lk]

Adapting HX711 modules for 3.3V Operation

The HX711 is a versatile integrated circuit (IC) designed for precision analog-to-digital (A/D) conversion, particularly suited for strain gauge load cell applications. It features a 24-bit A/D converter with a differential input stage capable of handling both single-ended and differential input signals. Additionally, this device offers adjustable gain amplification to accommodate various load cell sensitivities.

A common module based on the HX711 available in the market, including on AliExpress, is shown below. This module utilizes its internal analog supply regulator, which ensures a stable analog supply (AVDD) for the ADC and other internal components. The output voltage of the regulator (AVDD) is calculated using the following formula: VAVDD = VBG × (R1 + R2) / R2.

According to the electrical characteristics listed in the datasheet, the reference bypass voltage (VBG) is 1.25V. For the modules mentioned, R1 is set at 8.2kΩ and R2 at 20kΩ. By substituting these values into the formula, we calculate AVDD to be approximately 4.29V.

The HX711 IC operates within a voltage range of 2.6V to 5.5V. However, many HX711 modules on the market come with an internal voltage regulator that outputs approximately 4.29V. This can pose challenges when using the module with 3.3V microcontrollers. Furthermore, the datasheet specifies that the output voltage of the regulator should be at least 100mV lower than the supply voltage (VSUP), making the current regulator's output voltage incompatible with 3.3V supply voltages.

To address this, we need to ensure that AVDD is within the 2.6V to 3.2V range to make the module compatible with both 3.3V and 5V systems. After conducting some calculations, we determined that replacing R1 with 10kΩ and R2 with either 15kΩ or 12kΩ would be ideal. Using a 15kΩ resistor gives an AVDD of 3.1V, while using a 12kΩ resistor reduces it to 2.75V. In one of our experimental boards, we opted to replace R2 with a 12kΩ resistor.

As a further test, we lowered the AVDD to approximately 1.6V, and at this voltage, the HX711 still produced the correct results in our test setup. Interestingly, we observed that swapping R1 and R2 allows us to achieve an AVDD of 1.76V. To test this, we swapped R1 (8.2kΩ) and R2 (20kΩ) in one of the modules, and after applying a 5V supply, we noted that the AVDD returned at 1.65V, with the HX711 still providing correct outputs.

To evaluate the boards, we created a quick prototype using the STM32F405 MCU. In this prototype, we powered the HX711 module with 3.3V and directly connected its I/O pins to the STM32 GPIO pins.

For interaction with the module, we utilized the HX711 library provided at https://github.com/PCov3r/HX711-STM32-Library. The source code for our test firmware is available here.

After making the above modifications, all modules produce a stable output at 3.3V. We tested these modules with both 3.3V and 5V MCUs, using 5kg, 10kg, and 20kg load cells, and it operated correctly across all these combinations.

[quartzcomponents]

5KG Load Cell with HX711 A/D Weight Sensor Module

To measure weight and load of any object we use strain gauges but problem with using standalone strain gauge is that they are fragile and are easily bent and break if not used in proper enclosure. This load cell made up of aluminium alloy can measure upto 5 kg load and outputs in the form of electrical signals proportionally.

Buy this Load cell with Weight sensor module: https://quartzcomponents.com/products/load-cell-5kg-with-hx711-a-d-module-weight-sensor

[draegerit]

5kg load cell at Arduino UNO with HX711 Module #loadcell #arduino #hx711 #maker #diy #tech #techy #technology #electronic #components #microcontroller #draegerit (hier: Stefan Draeger Software) https://www.instagram.com/p/CXy8tIorkeC/?utm_medium=tumblr

[electroniccomponentsutmel]

Download HX711 Datasheet PDF and Pinout File

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[planetarduino]

This electronic arrow spine tester measures arrow consistency

Repeatability requires consistency. This principle even applies to archery. If you want to hit the bullseye on every shot, you have to draw the string with consistent force, keep your stance consistent, and so on. You also want your arrows to be as consistent as possible. One major factor that goes into an arrow’s consistency is the stiffness of the shaft, called the spine rating. This electronic tester makes it easy to measure that.

The simplest and most common way to determine an arrow’s spine rating is to place the arrow on two supports — one near the head and one near the fletching. You then hang a weight from the middle of the shaft and measure how much it bends. More sophisticated mechanical testers include a dial, similar to what you’d see on a torque wrench. This electronic tester follows the same principles, but provides digital precision.

This tester has three load cells. Two are underneath the supports that the arrows rest on. The third is below the center of the shaft. An Arduino Nano board reads the output from the load cells via HX711 amplifier modules. The archer pushes down on the shaft, which pushes onto the middle load cell. Between the three load cells, the Arduino then knows the total force applied to the arrow and the force from the deflected portion of the shaft. A few calculations later and the Arduino outputs the spine rating on a small LCD screen.

It’s a quick and easy way to make sure every arrow in the quiver has the same spine rating, ensuring consistency and repeatability.

The post This electronic arrow spine tester measures arrow consistency appeared first on Arduino Blog.

This electronic arrow spine tester measures arrow consistency was originally published on PlanetArduino

[pajyqosudera]

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[quartzcomponents]

10KG Load Cell with HX711 A/D Weight Sensor Module

To measure weight and load of any object we use strain gauges but problem with using standalone strain gauge is that they are fragile and are easily bent and break if not used in proper enclosure. This load cell made up of aluminium alloy can measure up to 5 kg load and outputs in the form of electrical signals proportionally.

Specifications:

Differential input voltage: ±40mV (Full-scale differential input voltage is ± 40mV)

Data accuracy: 24 bit (24 bit A / D converter chip.)

Refresh frequency: 10/80 Hz

Operating Voltage: 2.7V to 5VDC

Operating current: <10 mA

Buy this weight sensor: https://quartzcomponents.com/products/load-cell-5kg-with-hx711-a-d-module-weight-sensor

[cashbackonelectronics]

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[rearxe-muivca]

HX711 Load Cell Amplifier Module for MCU AVR Arduino http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=2&toolid=10044&campid=5337410312&customid=&lgeo=1&vectorid=229466&item=281945555479

[louqno-beaqfo]

HX711 Load Cell Amplifier Module for MCU AVR Arduino http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=2&toolid=10044&campid=5337410312&customid=&lgeo=1&vectorid=229466&item=281945555479

[qiidda-fiacyo]

HX711 Load Cell Amplifier Module for MCU AVR Arduino http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=2&toolid=10044&campid=5337410312&customid=&lgeo=1&vectorid=229466&item=281945555479

[mangowall]

Overview:   1. Weighing sensor display for various weighing display occasions. 24-bit A / D high-precision weight value, the module can display the weight sensor analog signal while ...