LM75 Temperature Sensor

// Include Wire library for I2C communication
// Arduino Uno R3 I2C pins are fixed: SDA=A4, SCL=A5
#include <Wire.h>

// LM75 I2C address (usually 0x48)
#define LM75_ADDRESS 0x48

void setup() {
  // Start I2C communication
  Wire.begin();
  
  // Start serial for debugging (9600 baud)
  Serial.begin(9600);
}

void loop() {
  // Read temperature value
  Wire.beginTransmission(LM75_ADDRESS);
  Wire.write(0x00);  // Temperature register address
  Wire.endTransmission();
  
  // Read 2 bytes of data
  Wire.requestFrom(LM75_ADDRESS, 2);
  if(Wire.available() >= 2) {
    int highByte = Wire.read();      // High byte
    int lowByte = Wire.read();        // Low byte
    
    // Combine into 16-bit temperature value
    int tempRaw = (highByte << 8) | lowByte;
    
    // Convert to actual temperature (unit: Celsius)
    // LM75 temperature value is 11-bit, highest bit is sign bit
    float temperature = (tempRaw >> 5) * 0.125;
    
    // Display temperature on Serial Monitor
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println("°C");
  }
  
  // Delay 1 second to avoid reading too fast
  delay(1000);
}

# Import required modules
from machine import Pin, I2C  # GPIO control and I2C communication
import time                   # For delay (time.sleep)

# Define I2C address and pins
LM75_ADDRESS = 0x48  # LM75 I2C address (usually 0x48)
SDA_PIN = 0          # GPIO connected to SDA (e.g. GPIO 0)
SCL_PIN = 1          # GPIO connected to SCL (e.g. GPIO 1)

# Create I2C object
i2c = I2C(0, sda=Pin(SDA_PIN), scl=Pin(SCL_PIN), freq=100000)  # Create I2C object, frequency 100kHz

# Main loop: runs forever
while True:
    # Read temperature value (read 2 bytes from register 0x00)
    data = i2c.readfrom_mem(LM75_ADDRESS, 0x00, 2)  # Read 2 bytes from address 0x00
    
    # LM75 returned data: data[0] is high byte (MSB), data[1] is low byte (LSB)
    # Combine into 16-bit temperature value (high byte first, big-endian)
    tempRaw = (data[0] << 8) | data[1]
    
    # Convert to actual temperature (unit: Celsius)
    # LM75 temperature value is 11-bit signed number, unit is 0.125°C
    # Method: Keep consistent with Arduino version, directly shift right by 5 bits
    # Note: Python's right shift for signed numbers performs sign extension
    # First convert unsigned number to signed number (if highest bit is 1)
    if tempRaw & 0x8000:
        tempRaw_signed = tempRaw - 0x10000
    else:
        tempRaw_signed = tempRaw
    
    # Shift right by 5 bits to get 11-bit temperature value, then multiply by 0.125
    temperature = (tempRaw_signed >> 5) * 0.125
    
    # Display temperature on terminal
    print("Temperature: {:.2f}°C".format(temperature))
    
    # Delay 1 second to avoid reading too fast
    time.sleep(1)