Arduino 实例（二十九）使用python pyserial模块实现示波器功能

1 电路连接示意图

2 实物连接照片

3 Python 程序

import timeimport matplotlib.pyplot as pltfrom drawnow import *import serialval = [ ]cnt = 0port = serial.Serial('COM3', 115200, timeout=0.5)plt.ion()#create the figure functiondef makeFig():    plt.ylim(-1023,1023)    plt.title('Osciloscope')    plt.grid(True)    plt.ylabel('ADC outputs')    plt.plot(val, 'ro-', label='Channel 0')    plt.legend(loc='lower right')while (True):    port.write(b's') #handshake with Arduino    if (port.inWaiting()):# if the arduino replies        value = port.readline()# read the reply        print(value)#print so we can monitor it        number = float(value) #convert received data to integer        print('Channel 0: {0}'.format(number))        # Sleep for half a second.        time.sleep(0.01)        val.append(int(number))        drawnow(makeFig)#update plot to reflect new data input        plt.pause(.000001)        cnt = cnt+1    if(cnt>50):        val.pop(0)#keep the plot fresh by deleting the data at position 0

4 Arduino程序

int sensorpin = A0;void setup() {  // initialize serial communication at 115200 bits per second to match that of the python script:  Serial.begin(115200);}void loop() {  // read the input on analog pin 0  float sensorValue = analogRead(sensorpin);  byte data = Serial.read();  if (data == 's')  {    Serial.println(sensorValue);    delay(10);        // delay in between reads for stability  }}

5 效果

6 视频效果

Ardrino借助Python做一个示波器 - 西瓜视频 (ixigua.com)