There are two modifications per channel that can be done to adjust the output voltage of the shield described below: The gain of the amplification per channel is dependent on the Gain1 / Gain2 resistors. You can learn more about getting ADC data from load cell using Arduino here. Do you use a 5volt Arduino (which one), and is the HX711 powered by 5volt (not 3.3volt). In this example A = 10 kg. In this project we will be “interfacing HX711 Load cell amplifier with Arduino” and 16*2 LCD for designing Arduino Weighing Machine using Load Cell HX711. Source: http://www.theorycircuit.com/how-to-connect-load-cell-to-arduino/. 1. I tried several codes but I'm not getting the result I need. The HX711 is easily wired to the Arduino using any two digital or analog pins. You can make certain by measuring the resistances between the wires and exciting on the pair with the greatest resistance, and sensing on the middle terminal. 4. Suggested Reading. Also, connect a simple push button for calibration. // Step 1: Upload this sketch to your arduino board // You need two loads of well know weight. The two common approaches for interfacing a load cell with an Arduino are : Luckily, there is a new option for those seeking a plug and play solution to avoid extra wiring and coding: the Strain Gauge / Load Cell Amplifier Shield. Connect the middle cable (red) of the load cell to the A+ input of the HX711 module. Nice instruction. You can use a pre-packaged instrumentation-amp IC like the INA125. Strain Gauge / Load Cell Amplifier Shield, Arduino Tutorials - How to Stack Wheatstone Bridge Shields. 3. Instruments like load cells provide small signal values and need to be amplified for processing, so without additional electronics, these sensors cannot and should not be connected directly to an Arduino's I/O pins. The standard gain resistor value of the shield is 100 Ohm (for each channel) for a gain of 495. E+ and E- are the power wires for the cells. In this arduino tutorial of HX711 Load Cell amplifier interface. Over the years, many RobotShop customers have asked us about the easiest way to interface a load cell with an Arduino board so they can get accurate weight measurements. Connect load cell pins to the instrumentation amplifier as shown in the schematic diagram. These resistors can be replaced depending on the user's application with the appropriate ones. To avoid mixing the wires when connecting the load cell, you can choose the same color wires as those of the load cell : Connect the load cell to the Load Cell Amplifier Shield: Stack the Load Cell Amplifier Shield on top of the Arduino board (in our case, a Lynxmotion BotBoarduino): The Load Cell Shield uses analog pins A0 and A1 for Strain 1 and Strain 2 inputs respectively. A load cell usually has 4 wires, but it's important to check the wiring for the unit you have: The parts needed for connecting the load cell to the shield : Solder the F/F jumper wires to the Load Cell wires. This board makes interfacing an Arduino and an instrumentation amplifier significantly easier. Simply connect Load cell wires to the HX711 module based on their color, then connect DAT (Data) pin to Arduino Analog pin A1 and connect CLK (Clock) pin to Arduin0 Analog pin A0, Put Vcc and Gnd supply from Arduino power source pins. The connection between Load Cell & HX711 has been explained above. Clock. The Resistor 10Ω connected between pin 8 & 9 is responsible for Gain of INA 125 instrumentation amplifier, the output is taken combined from Vo and Sense (Pin 10 & 11) and it is fed into Arduino analog pin A0. Anyone can control it ) comment, the colors on the user 's application with the appropriate ones need power. 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