Arduino Serial Monitor

Arduino Serial Monitor

This skill provides advanced tools for reading and analyzing serial monitor data from Arduino boards, enhancing the debugging experience beyond the basic Arduino IDE serial monitor.

Features

• Real-time Serial Monitoring: Connect to Arduino serial ports and display data in real-time
• Data Logging: Save serial output to files with timestamps for later analysis
• Filtering & Pattern Matching: Filter output by keywords, regex patterns, or data types
• Error Detection: Automatically highlight common error patterns and warnings
• Multiple Format Support: Handle different data formats (text, JSON, CSV, binary)
• Cross-platform: Works with Windows, macOS, and Linux serial ports

Usage

Basic Serial Monitoring

# Monitor serial port with default settings (9600 baud)
uv run --no-project scripts/monitor_serial.py --port COM3

# Specify baud rate and output file
uv run --no-project scripts/monitor_serial.py --port /dev/ttyACM0 --baud 115200 --output debug.log

# Filter for specific patterns
uv run --no-project scripts/monitor_serial.py --port COM3 --filter "ERROR|WARNING"

Advanced Debugging

# Parse JSON data from serial
uv run --no-project scripts/monitor_serial.py --port COM3 --format json --pretty

# Monitor with timestamp and color coding
uv run --no-project scripts/monitor_serial.py --port COM3 --timestamp --color

# Detect common Arduino errors
uv run --no-project scripts/monitor_serial.py --port COM3 --detect-errors

Script Options

• --port: Serial port (e.g., COM3, /dev/ttyACM0)
• --baud: Baud rate (default: 9600)
• --output: Output file for logging
• --filter: Regex pattern to filter lines
• --format: Data format (text, json, csv, binary)
• --timestamp: Add timestamps to output
• --color: Enable color-coded output
• --detect-errors: Highlight common error patterns
• --timeout: Connection timeout in seconds

Common Arduino Debugging Scenarios

Memory Issues

Filter for: "low memory|stack overflow|heap"

Sensor Data Validation

Filter for: "sensor|reading|value"
Format as: json

Timing Analysis

Enable: --timestamp
Filter for: "start|end|duration"

Communication Errors

Filter for: "timeout|failed|error"
Enable: --detect-errors

Integration with Arduino CLI

# Compile and upload, then monitor
arduino-cli compile --fqbn arduino:avr:uno sketch/
arduino-cli upload -p COM3 --fqbn arduino:avr:uno sketch/
uv run --no-project scripts/monitor_serial.py --port COM3

Troubleshooting

Port Not Found

• Check arduino-cli board list for available ports
• Ensure Arduino is connected and drivers are installed
• Try different port names (COM1-COM99 on Windows, /dev/ttyACM* on Linux)

No Data Received

• Verify baud rate matches Arduino sketch (Serial.begin(9600))
• Check USB cable connection
• Reset Arduino board while monitoring

Permission Errors (Linux/macOS)

# Add user to dialout group
sudo usermod -a -G dialout $USER
# Logout and login again

Dependencies

• Python 3.8+
• pyserial
• colorama (for colored output)
• Install via: uv add pyserial colorama

Examples

Basic Temperature Sensor Monitoring

// Arduino sketch
void setup() {
  Serial.begin(9600);
}

void loop() {
  float temp = analogRead(A0) * 0.488;
  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.println(" C");
  delay(1000);
}

uv run --no-project scripts/monitor_serial.py --port COM3 --filter "Temperature" --timestamp

JSON Data Parsing

// Arduino sketch with JSON output
#include <ArduinoJson.h>

void setup() {
  Serial.begin(115200);
}

void loop() {
  StaticJsonDocument<200> doc;
  doc["temperature"] = analogRead(A0) * 0.488;
  doc["humidity"] = analogRead(A1) * 0.146;
  doc["timestamp"] = millis();
  serializeJson(doc, Serial);
  Serial.println();
  delay(2000);
}

uv run --no-project scripts/monitor_serial.py --port COM3 --format json --pretty

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