CJMCU 75 LM75 Temperature Sensor High speed I2C Development Board

CJMCU 75 LM75 Temperature Sensor High speed I2C Development Board

The CJMCU-75 is a compact temperature sensor development board based on the LM75 digital temperature sensor IC. It provides accurate digital temperature measurement with a high-speed I²C interface, making it ideal for microcontroller, Arduino, ESP32, Raspberry Pi, and embedded system projects.

This module outputs direct digital temperature data, eliminating the need for analog-to-digital conversion. It also supports over-temperature alarm and thermostat functions, making it suitable for both monitoring and control applications. The small size and standard pinout make it easy to integrate into prototypes and final products.

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Applications

• Arduino, ESP32, Raspberry Pi temperature monitoring
• Embedded system thermal management
• Data logging and IoT projects
• Power supply and battery temperature monitoring
• Industrial control and automation
• Educational and DIY electronics projects

Features

• Based on: LM75 Digital Temperature Sensor IC
• Interface: High-speed I²C / SMBus compatible
• Direct digital temperature output
• No ADC required
• Supports over-temperature alarm / thermostat output
• High accuracy and good stability
• Operating voltage: 3V to 5V (board dependent)
• Measurement range: -55 °C to +125 °C (typical)
• Resolution: 0.125 °C or 0.5 °C (depends on IC version)
• Compact, breadboard-friendly PCB
• Onboard pull-up resistors (typically included)
• Easy to use with Arduino and other microcontrollers