Question

我正在尝试在arduino和pySerial之间进行通信，但串行监视器正在给我回复奇怪的字符，所以arduino没有像它应该那样开启/关闭。提前谢谢。

Arduino code

int ledpin = 13;
int state; // 0 = led off, 1 = led on 
int flag = 0; // used so msg is only printed once
char val;

void setup(){
    pinMode(ledpin, OUTPUT);
    digitalWrite(ledpin, LOW);
    Serial.begin(9600); 
}

void loop(){
    //if data sent, read and save 
    if(Serial.available() > 0){
        state = Serial.read() -'0';
        val = char(state);
        Serial.println(val);
        flag = 0;
    }

    //if state = 0
    if (val == '0'){
        digitalWrite(ledpin, LOW);
        if(flag = 0){
            Serial.println('LED : Off');
            flag = 1;
        }
    }

    //if state = 1
    if (val = '1'){
        digitalWrite(ledpin,HIGH);
        if(flag = 0){
            Serial.println('LED : On');
            flag = 1;
         }
    }
}

Python代码

import serial
from tkinter import *

port = '/dev/ttyACM0'
speed = 9600

def send_command(val):
connection = serial.Serial(port,speed)
connection.write(b"val")
connection.close()


#Create the window
win = Tk()

#Modify the root window
win.title("Arduino system") # gives title to window
win.geometry("320x100") # sets the size of the window

#Creating components
f = Frame(win) # creates window
#label with text
l = Label(win , text = "Flash LED")
b1 = Button(f, text ="Send 0")
b2 = Button(f, text ="Send 1")


#Defining methods
def but1(): send_command('0')  # command run if button 1 pressed
def but2(): send_command('1')  # command run if button 1 pressed
b1.configure(command = but1) # assiging methods to buttons
b2.configure(command = but2) # assiging methods to buttons



#Adding Components
l.pack() #packs in the label
b1.pack(side = LEFT) #packs the buttons in one after the other
b2.pack(side = LEFT) #packs the buttons in one after the other

f.pack()

win.mainloop() # start Gui

从python发送0到arduino后，串行监视器上会出现以下内容 F 1 ＆LT;

发送1

后

出现同样的事情

Answer 1

这段代码：

state = Serial.read() -'0';
val = char(state);
Serial.println(val);

将打印(char) 0而不是'0'和(char) 1而不是'1'。您还要将val与字符常量进行比较，就像它是一个字符一样。但是，您的代码会将其转换为存储在字符中的整数值。

→您应该决定变量的类型以及存储在其中的内容。

另外

Serial.println('LED : Off');

和

Serial.println('LED : On');

应该最有可能使用"个'引号。

arduino使用pySerial打开/关闭

1 个答案: