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README
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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...