I found a dead scale at work, the electronics were fried. I figured the load cell inside was still good, and would be fun to hack. I stripped out the load cell, and connected it to an Arduino with a HX711 amplifier /. An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for reading load cells / weight scales. It supports the architectures atmelavr, espressif8266, espressif32, atmelsam, teensy and ststm32 by corresponding PlatformIO targets.

I am working on an application where i need to convert the weight of a person to calculate and use it for other parameter. So i started searching the internet and found many tutorials using the load cell and arduino. I started by opening up a bathroom scale and using the sensors available in it. It turned out after trying with the AD620 insrumentation amplifier that i was not getting linear results and the readings were not accurate so i decided to use HX711 instead. Also the code provided displays the weight in KG and can measure upto 120KGs. I am publishing this instructable so it helps someone like me to make their project faster.

So the sensor gives the analog voltage as an output to the arduino but the voltage level is too small to be detected by the adc of the arduino and needs to be amplified using instrumentation amplifiers like AD620 or INA125. Also the ADC on the arduino is 10 bit which provides a maximum of 2^10 ie. 1024 readings compared to HX711 which is 24 bit ADC and easy to interface. The Hx711 uses SPI interface to communiacate to the Arduino. Free download program google earth plus 4372843916 full patch 2017. (Refer Data sheet for more info) More info on Connecting to Arduino Connection is pretty simple.

Connect the wires from the load sensors E+ E- on the terminals of the sensor 2. Connect the S+ and S- wires on the A+and A- terminals respectively. Connect Vcc and Gnd 4. Connect the Dt terminal to A1 and Sck terminal to A0 (can be changed according to code). Hey guys, i'm doing a balance system with 4 balances to do a mass balance in a race car (a project of my university).

I did all, but the balances display a wrong result. I calibrated the system (individualy) but when i put a 5kg mass in the balance (used to calibration) all display the same value, but if i mount in the balances, one same more and one same less. I don't know what's happening, could it be the cables? (i need a long cable) I'm sorry for my bad english, i'm brazilian. Please Help me!

I have made same kind of circuit but I am getting a problem in amplifying the voltage. I have tried this with a 3 wired load sensor in which I am keeping 2 resistors on the breadboard and 2 wires (black and white) coming out of load sensor are connected to make a Wheatstone bridge and I am reading the value of voltage between red wire of load sensor and its other end in Wheatstone bridge. Now when I am applying force on load sensor then it's value are changing ( very minute change but still change I have to amplify that). Now my problem is I am able to amplify the value of the voltage but the change is so minute that it's amplification doesn't show up in comparison to the actual voltage. How should I go about it? I received always this error. How can i solve this error?