TheTNR
Published © GPL3+

Smart Coffee Table with Nano and HX711

This smart coffee table illuminates your environment according to the weight of your drink.

AdvancedFull instructions provided1,371
Smart Coffee Table with Nano and HX711

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
SparkFun Load Cell Amplifier - HX711
SparkFun Load Cell Amplifier - HX711
×1
Linear Regulator (7805)
Linear Regulator (7805)
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Grove - WS2813 RGB LED Strip Waterproof - 60 LED/m - 1m
Seeed Grove - WS2813 RGB LED Strip Waterproof - 60 LED/m - 1m
×1
BD 135 Transistor
×1

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
3D Printer (generic)
3D Printer (generic)

Story

Read more

Schematics

hx71112222_kb1dYR9i2M.png

Hx71112222 kb1dyr9i2m

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Ilk devreeee 7r9m5fads4

Code

HX711_full_example.ino

Arduino
/**
 *
 * HX711 library for Arduino - example file
 * https://github.com/bogde/HX711
 *
 * MIT License
 * (c) 2018 Bogdan Necula
 *
**/
#include "HX711.h"


// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 2;
const int LOADCELL_SCK_PIN = 3;


HX711 scale;

void setup() {
  Serial.begin(38400);
  Serial.println("HX711 Demo");
  pinMode(9,OUTPUT);
   pinMode(10,OUTPUT);
    pinMode(11,OUTPUT);

  Serial.println("Initializing the scale");

  // Initialize library with data output pin, clock input pin and gain factor.
  // Channel selection is made by passing the appropriate gain:
  // - With a gain factor of 64 or 128, channel A is selected
  // - With a gain factor of 32, channel B is selected
  // By omitting the gain factor parameter, the library
  // default "128" (Channel A) is used here.
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);

  Serial.println("Before setting up the scale:");
  Serial.print("read: \t\t");
  Serial.println(scale.read());			// print a raw reading from the ADC

  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));  	// print the average of 20 readings from the ADC

  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));		// print the average of 5 readings from the ADC minus the tare weight (not set yet)

  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);	// print the average of 5 readings from the ADC minus tare weight (not set) divided
						// by the SCALE parameter (not set yet)

  scale.set_scale(2280.f);                      // this value is obtained by calibrating the scale with known weights; see the README for details
  scale.tare();				        // reset the scale to 0

  Serial.println("After setting up the scale:");

  Serial.print("read: \t\t");
  Serial.println(scale.read());                 // print a raw reading from the ADC

  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));       // print the average of 20 readings from the ADC

  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));		// print the average of 5 readings from the ADC minus the tare weight, set with tare()

  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);        // print the average of 5 readings from the ADC minus tare weight, divided
						// by the SCALE parameter set with set_scale

  Serial.println("Readings:");
}

void loop() {
  Serial.print("one reading:\t");
  Serial.print(10*scale.get_units(), 1);
  Serial.print("\t| average:\t");
  Serial.println(10*scale.get_units(10), 1);





if(10*scale.get_units()<185)
{
  analogWrite(9,255);
  analogWrite(10,0);
  analogWrite(11,0);
  }
 else if(10*scale.get_units()<220)
  {
    analogWrite(9,255);
    analogWrite(10,0);
    analogWrite(11,100);
   }
    else if(10*scale.get_units()<270)
  {
    analogWrite(9,0);
    analogWrite(10,0);
    analogWrite(11,200);
   }
    else if(10*scale.get_units()<320)
  {
    analogWrite(9,0);
    analogWrite(10,255);
    analogWrite(11,0);
   }
   else{
   analogWrite(9,100);
  analogWrite(10,200);
  analogWrite(11,200);}








  
  scale.power_down();			        
  delay(5);
  scale.power_up();
}

Credits

TheTNR

TheTNR

5 projects • 60 followers
A teacher at high school. I am an electronics teacher.

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