How to send string from Python to Arduino?

Projects Programming
1

Hi everyone! I have some problem with Arduino( I send string from Python to Arduino for control the DAC, but string dont received... I dont' know what to do. I also checked all solutions from the web but it didn't help.

Arduino code:
#include <Wire.h> //wire library
#include <Adafruit_MCP4725.h> // MCP4725 library from adafruit
#define analogPin A1 // Analog voltage input to A1
int start;
int analogValue;
Adafruit_MCP4725 MCP4725;

void setup() {
Serial.begin(9600);
MCP4725.begin(0x60);
pinMode(analogPin, INPUT);

}

void loop() {
uint32_t MCP4725_value;
start = Serial.readStringUntil('\n').toInt();
for (MCP4725_value = start; MCP4725_value < 1000; MCP4725_value = MCP4725_value + 15)
{
MCP4725.setVoltage(MCP4725_value, false);
delay(200);
analogValue = analogRead(analogPin);

  Serial.print("Start Value: ");
  Serial.print(start);

  Serial.print("\tAnalog signal: ");
  Serial.println(analogValue);
}

}

Python code:
import serial
import time

arduino = serial.Serial('COM3', 9600)
time.sleep(3)
last_msg = ''
try:
print('Данные из порта', arduino)
while True:
finalString = "100" + "\n"

    if finalString != last_msg:
        arduino.write(finalString.encode())
        last_msg = finalString
    data = arduino.readline().decode().strip()
    time.sleep(0.2)
    print(data, 'мВ')

except KeyboardInterrupt:
print('Программа остановлена')
arduino.close()
2

Welcome to the forum

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use [color = red]code tags[/color] (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

4

make sure the DAC I2C is 0x60 instead of 0x62 or 0x63

You can run a scan program to verify