Question

我正在尝试编写一个代码，以供arduino读取，然后将数据发送到python，以便打印并保存以供将来分析。问题是，当我查看arduino的串行监视器时，它是一致的数字流。这就是我想要的，但是当使用python时，有时会将此数字乘以100。大约每4行数据就会发生一次。我很难根据我编写的代码和用作指导的代码来弄清楚为什么会发生这种情况。

Arduino

#include <HX711_ADC.h>
#include "CytronMotorDriver.h"


// Configure the motor driver.
CytronMD motor(PWM_DIR, 3, 2);  // PWM = Pin 3, DIR = Pin 2.

int up = HIGH;
int down = LOW;
int dstate = up;
float interval = 12000;
float pretime= 0;
float curtime = 0; 


// LOAD CELL
//HX711 constructor (dout pin, sck pin)
HX711_ADC LoadCell(11, 12);
float force;  
float calforce;
float newtons;


// The setup routine runs once when you press reset.
void setup() {
 Serial.begin(9600);
 LoadCell.begin();
 LoadCell.start(2000); // tare preciscion can be improved by adding a few seconds of stabilising time
 LoadCell.setCalFactor(100); // user set calibration factor (float)
}

// The loop routine runs over and over again forever.
void loop() {

  LoadCell.update();
  force = LoadCell.getData();
  force = (force/285); // Force in (N) // 285 is conversion factor
  calforce = (-1.0389*force)+0.0181, // This is in lbs
  newtons = 4.45*calforce;



  //receive from serial terminal for tare
  if (Serial.available() > 0) {
  char inByte = Serial.read();
  if (inByte == 't') LoadCell.tareNoDelay();
  }

unsigned long curtime = millis();

  if (dstate == up && (curtime - pretime >= interval)) {
    motor.setSpeed(255);  // Run forward at full speed.
    pretime = curtime; 
    dstate = down;


  }

  if (dstate == down && (curtime - pretime >= interval)) {
    motor.setSpeed(-255);  // Run backward at full speed.
    pretime = curtime;
    dstate = up;

  }


  Serial.println(newtons);
}

Arduino输出 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

Python

import serial
import csv
import time
from time import localtime, strftime
#import numpy as np
import warnings
import serial.tools.list_ports


__author__ = 'Matt Munn'
arduino_ports = [
    p.device
    for p in serial.tools.list_ports.comports()
    if 'Arduino' in p.description
]
if not arduino_ports:
    raise IOError("No Arduino found - is it plugged in? If so, restart computer.")
if len(arduino_ports) > 1:
    warnings.warn('Multiple Arduinos found - using the first')

Arduino = serial.Serial(arduino_ports[0],9600)

Arduino.flush()
Arduino.reset_input_buffer()

start_time=time.time()

Force = []

outputFileName = "Cycle_Pull_Test_#.csv"
outputFileName = outputFileName.replace("#", strftime("%Y-%m-%d_%H %M %S", localtime()))

with open(outputFileName, 'w',newline='') as outfile:

    outfileWrite = csv.writer(outfile)

    while True:
        while (Arduino.inWaiting()==0):
            pass
        try:
            data = Arduino.readline()
            dataarray = data.decode().rstrip().split(',')
            Arduino.reset_input_buffer()
            Force = round(float(dataarray[0]),3)
            print (Force)
        except (KeyboardInterrupt, SystemExit,IndexError,ValueError):
            pass

        outfileWrite.writerow([Force,"N"])

Python输出 0.08 8.0 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08 8.0 0.08

这只是我代码的基本内容，我打算根据传感器的读数来控制线性执行器，但是如果我无法使该数据流保持一致，那么我将无法继续该项目。谢谢！

Pyserial正在从arduino获取不一致的数据

0 个答案: