ひずみゲージ奮闘記 – 評価編（Round3）

Arduino

/**
 *
 * HX711 library for Arduino - example file
 * https://github.com/bogde/HX711
 *
 * MIT License
 * (c) 2018 Bogdan Necula
 *
 *ひずみゲージ(L3M2R)用に改変、2024,
**/
#include "HX711.h"


// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 8;
const int LOADCELL_SCK_PIN = 9;


HX711 scale;

void setup() {
  Serial.begin(38400);
  Serial.println("HX711 Demo");

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

  Serial.print("read average:");
  Serial.println(scale.read_average(100));  	// print the average of 20 readings from the ADC

  Serial.print("get value:");
  Serial.println(scale.get_value(20));		// print the average of 5 readings from the ADC minus the tare weight (not set yet)

  Serial.print("get units:");
  Serial.println(scale.get_units(20), 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:");
  Serial.println(scale.read());                 // print a raw reading from the ADC

  Serial.print("read average:");
  Serial.println(scale.read_average(100));       // print the average of 20 readings from the ADC

  Serial.print("get value:");
  Serial.println(scale.get_value(20));		// print the average of 5 readings from the ADC minus the tare weight, set with tare()

  Serial.print("get units:");
  Serial.println(scale.get_units(20), 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(average(100)):");
}

void loop() {
  // Serial.print("one reading:\t");
  // Serial.print(scale.get_units(), 1);
  // Serial.print("\t| average:\t");
  Serial.print(scale.get_units(50), 1);
  Serial.print(",");

  // scale.power_down();			        // put the ADC in sleep mode
  // delay(10);
  // scale.power_up();

  // 温度センサ(LM35DZ)
  int  sensorValue = analogRead(A0);
  float voltage = sensorValue * (3.2 / 1023.0);

  Serial.println(voltage*100,1);
  
}

Python

import serial
import datetime

com = serial.Serial("COM3", 38400)

while True:
    val = str(com.readline().decode("utf-8").rstrip(None))
    date = datetime.datetime.now().strftime("%H:%M:%S")
    with open("240602_Calib_round3_1st.csv", "a") as f:
        print("{},{}".format(date, val), file=f)