请求将电表读数Python程序转换为Arduino Uno Sketch（编程新手求助）

Hey there! I’ll help you translate your Python serial code into something that works on an Arduino Uno. I’ll break everything down step by step so it’s easy to follow, even as a new programmer.

First, Hardware Setup #

Your Python script uses a USB-to-serial adapter to communicate with the meter. For the Arduino Uno, we’ll use a SoftwareSerial port (this keeps the built-in USB serial free for debugging and monitoring your code). Here’s how to connect everything:

• Connect your USB-to-serial module’s TX pin to Arduino pin 2 (this acts as the Arduino’s "receive" pin for the meter)
• Connect your USB-to-serial module’s RX pin to Arduino pin 3 (this acts as the Arduino’s "transmit" pin for the meter)
• Connect GND between the Arduino, USB-to-serial module, and the meter (a common ground is critical for reliable communication!)
• Quick note: If your meter uses RS232 voltage levels (not TTL), you’ll need an RS232-to-TTL converter (like a MAX232 module) between the meter and the USB-to-serial adapter.

The Arduino Code #

This code does exactly what your Python script does: sends the SNRM command, waits 1 second, then reads and prints all incoming data as hex (just like your data.hex() in Python). I’ve added comments to explain every part:

// Include the SoftwareSerial library to create a second serial port
#include <SoftwareSerial.h>

// Define pins for the meter's serial connection
const int meterRxPin = 2;
const int meterTxPin = 3;

// Create a SoftwareSerial object to talk to the meter
SoftwareSerial meterSerial(meterRxPin, meterTxPin);

// Convert your SNRM hex string into a byte array (matches "7EA00703619369477E")
byte snrmCommand[] = {0x7E, 0xA0, 0x07, 0x03, 0x61, 0x93, 0x69, 0x47, 0x7E};

void setup() {
  // Start the built-in serial port (for debugging on the Serial Monitor)
  Serial.begin(9600);
  // Start the serial port for the meter (matches Python's default baud rate: 9600)
  meterSerial.begin(9600);

  Serial.println("Ready to send command to meter...");
}

void loop() {
  // Send the SNRM command to the meter (same as ser.write(bytes.fromhex(SNRM)) in Python)
  meterSerial.write(snrmCommand, sizeof(snrmCommand));
  Serial.println("Sent SNRM command");

  // Wait 1 second (same as time.sleep(1) in Python)
  delay(1000);

  // Read all available data from the meter and print as hex
  Serial.println("Received data (hex):");
  while (meterSerial.available() > 0) {
    byte incomingByte = meterSerial.read();
    // Print each byte as two hex characters (add leading zero for single-digit values)
    if (incomingByte < 0x10) {
      Serial.print("0");
    }
    Serial.print(incomingByte, HEX);
  }
  Serial.println("\n---"); // Add a separator for cleaner output

  // Wait 5 seconds before sending the command again (adjust this as needed)
  delay(5000);
}

What Each Part Does #

• SoftwareSerial Library: Lets us use regular digital pins as a serial port (since the Uno’s built-in serial is used to talk to your computer).
• snrmCommand: Converted your hex string into a byte array—this is the exact command your Python script sends to the meter.
• meterSerial.begin(9600): Matches the default baud rate of Python’s serial.Serial() function. If your meter uses a different baud rate, change this number to match.
• meterSerial.write(): Sends the command to the meter, just like ser.write() in Python.
• Reading Data: The while(meterSerial.available()) loop reads every byte the meter sends back, then prints it as hex (with leading zeros to match your Python output’s format).

How to Use It #

1. Open the Arduino IDE, paste this code.
2. Go to Tools > Board and select "Arduino Uno".
3. Select the correct port under Tools > Port.
4. Upload the code to your Uno.
5. Open the Serial Monitor (top-right icon, or Tools > Serial Monitor) and set the baud rate to 9600. You’ll see the command being sent and the meter’s response in hex!

内容的提问来源于stack exchange，提问作者Manish Gupta