Weight scale by Konstantinos Anastasakis https://github.com/kon-anast/kan-weight_scale My blog https://kostislab.blogspot.gr/ This is a weight scale program for Arduino with a HX711 module Components needed: -Arduino board (I use arduino pro mmini 3.3v) -Scale sensor (I got it from a broken kitchen scale) -HX711 module -Potentiometer -LCD 1602 module (in advance use also an i2c module) -Battery -Switches if there is noise from the sensor use two 0.1uf capacitors to filter the signal from the Scale sensor Setup your scale and start WITHOUT a weight on the scale Once readings are displayed place a known weight on the scale Αdjust the calibration_factor with the potentiometer until the output readings match the known weight ---CONNECTIONS--- HX711 connection *The HX711 board can be powered from 2.7V to 5V. Arduino pin D6 -> HX711 CLK Arduino pin D5 -> HX711 DOUT Arduino pin 5V -> HX711 VCC Arduino pin GND -> HX711 GND Sensor connection Excitation+ (E+) or VCC is red Excitation- (E-) or ground is black. Output+ (O+), Signal+ (S+)+ or Amplifier+ (A+) is white O-, S-, or A- is green or blue more info hire: https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide LCD display connection With I2C adapter check your board to find the SCK and SDA pins. more info hire: https://arduino-info.wikispaces.com/LCD-Blue-I2C Set the LCD address to 0x27 for a 16 chars 2 line display. A FEW use address 0x3F. ​Some of I2C LCD interfaces have pins (or solder pads) that can be changed to change the address. They are usually labelled as A0-A1-A2. Here's how the address change from a default 0x27 or 0x3F, if you connect the address pads together. A0	A1	A2	HEX Address (1 = Not Connected. 0 = Connected): 1	1	1	0x27 0	1	1	0x26 1	0	1	0x25 0	0	1	0x24 1	1	0	0x23 0	1	0	0x22 1	0	0	0x21 0	0	0	0x20 If no i2c adapter the connections will be: * LCD RS pin to digital pin 12 * LCD Enable pin to digital pin 11 * LCD D4 pin to digital pin 5 * LCD D5 pin to digital pin 4 * LCD D6 pin to digital pin 3 * LCD D7 pin to digital pin 2 * LCD R/W pin to ground * LCD VSS pin to ground * LCD VCC pin to 5V * 10K resistor: * ends to +5V and ground * wiper to LCD VO pin (pin 3) Potentiometer connection GND, A2, VCC Calibration, Zero and Memory Button connection D10, D11, D12 *All to GND, it will be LOW when pressed. Battery monitor To create voltage divider connect two resistors to A0 pin R1 10k to GND and A0 R2 25k - 75k to battery + and A0 more info hire: https://playground.arduino.cc/Main/DirectMathVoltmeter and Timer DS3231 module Future plans is to put a timer with a beeper, so I don't burn the food... maybe a bluetooth and esp also... :) Soft power on Not completed yet needs more work...