Components Required for Arduino Weighing Machine Arduino UNO Board x 1 16×2 Alphanumeric LCD x 1 Load Cell x 1 HX711 Module x 1 10K variable Resistor x 1 4.7K Resistor x 1 100 Resistor x 1 Push-to-on Switch x 1 Circuit Description of Arduino weighing Machine The arduino based layout of the project is shown in figure 1. As stated earlier, the Arduino UNO Board is the heart of the circuit.

It is accompanied by other components like Load Cell, analog to digital converter cum amplifier module, 16×2 alphanumeric LCD and few other passive components like resistors. Vruchenie yubilejnoj lenti yubilyaru. Calibration Circuit: The weight calibration circuit is shown in figure 2. This circuit is basically a switch with pull back resistor connect to arduino uno board digital pin D10.

When we push the switch the weight automatic calibrated to 0 KG and display the value 0.0 in LCD. Load Cell  Arduino Weighing Machine The load cell is basically a strain gauge which convert pressure into electrical signal. This utilize the basic method of measuring elongating or displacement. The method consists in using a strain gauge which provides a variation in resistance corresponding to the elongating or displacement to the measure. This load cell is resistance type strain gauge.

The load cell available in market is made from aluminum alloy because it has various advantage like light weight, more accurate, anti-rusting structure etc. The load cell shown in figure 2 is strain gauge and operated as Wheatstone bridge. HX711 Module  Arduino Weighing Machine The output of load cell is low and is analog in nature. Thus, we have decided to use an amplifier module which take input from load cell, amplify it and convert into digital form. It has distinct two input channel i.e. Channel A and Channel B.

Channel A is programmable gain amplifier having gain of 128 or 64 where as channel B is fixed gain amplifier of 32. Other features of this module are 24-bit high precision analog to digital converter.

Transducer, both HX711 and the transducer will be powered down. When PD_SCK returns to low, chip will reset and enter normal operation mode. After a reset or power-down event, input selection is default to Channel A with a gain of 128. Application Example Fig.1 is a typical weigh scale application using HX711. It uses on-chip oscillator (XI=0. So HX711 module amplifies the low electric output of Load cells and then this amplified & digitally converted signal is fed into the Arduino to derive the weight. Load cell is connected with HX711 Load cell Amplifier using four wires. These four wires are Red, Black, White and Green/Blue.

HX711 Module with connector is shown in figure 3. Arduino weighing machine circuit connection details The four wire of load cell red, black, white and green is connected to HX711 module to E+, E-, A- and A+ Pin respectively as shown in figure 1.

The two outputs of HX711 (SCK and DT) is connected to digital pin D3 and D2 of arduino uno board. This output is digital in nature. Channel B is left open, if you want more precision then you can connect another load cell and calculate average. Arduino UNO process this value and display it into LCD. The LCD we are using for project Arduino weighing machine is 16×2 alphanumeric LCD.

LCD can be interfaced in either 4-bit mode and in 8-bit mode. Here in this project we are using 4-bit mode. The higher data bit of LCD D4 to D& is connected to arduino UNO digital pin. Potentiometer VR 1 is used to adjust the constant of LCD. Note: Cathode and Anode pin of LCD (pin 15 and pin 16) is not shown in circuit diagram.

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