{"product_id":"cjmcu-75-lm75-i2c-digital-temperature-sensor-module","title":"CJMCU-75 LM75 I2C Digital Temperature Sensor Module","description":"\u003ch1\u003eCJMCU-75 LM75 I2C Temperature Sensor Module (±2°C Accuracy)\u003c\/h1\u003e\n\n\u003cp\u003eThe CJMCU-75 is a compact breakout board for the LM75 digital temperature sensor, communicating over I2C. It provides accurate temperature readings with ±2°C accuracy, ideal for environmental monitoring, HVAC systems, and automation projects. The module operates from 2.8V to 5.5V and includes pull-up resistors, making it easy to connect directly to 3.3V or 5V microcontrollers.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Chip\u003c\/td\u003e\n\u003ctd\u003eLM75\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eI2C (up to 400 kHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-25°C to +100°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e±2°C (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.125°C (11-bit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2.8V – 5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-arduino-digital-thermometer-kit\"\u003eBuild a digital room thermometer with an OLED display and Arduino Uno.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-cold-chain-temperature-data-logger\"\u003eCreate a Wi-Fi enabled temperature logger using ESP32 that uploads data to the cloud.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-fan-temperature-controller\"\u003eDesign a smart fan controller that adjusts speed based on ambient temperature.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eDevelop an over-temperature alarm system with a buzzer and LED indicator for machinery.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis module works with any microcontroller supporting I2C, including Arduino (Uno, Nano, Mega), ESP32, ESP8266, Raspberry Pi, and STM32. The onboard pull-up resistors allow direct connection to 3.3V or 5V logic levels. The default I2C address is 0x48, but you can chain up to 8 modules by configuring the A0-A2 pins.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 3.3V\/5V, GND to GND, SDA to A4 (Arduino Uno) or GPIO21 (ESP32), SCL to A5 (Arduino Uno) or GPIO22 (ESP32). No external pull-up resistors are needed as they are included on the module.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eYes, the CJMCU-75 works with Raspberry Pi via I2C. Enable the I2C interface in raspi-config, and you can read temperature using Python's smbus library.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use multiple sensors on the same I2C bus?\u003c\/summary\u003e\u003cp\u003eYes, by connecting the A0, A1, and A2 pins to different logic levels, you can set up to 8 unique addresses (0x48 to 0x4F). The module defaults to all grounded (0x48).\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the measurement update rate?\u003c\/summary\u003e\u003cp\u003eThe sensor updates temperature data roughly every 100 milliseconds, providing a balance between speed and power consumption.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444999774573,"sku":"CDN-0618","price":95.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_63ea84ef-dc5d-49dd-9b6b-84cae14f172c.jpg?v=1781512733","url":"https:\/\/compoden.com\/products\/cjmcu-75-lm75-i2c-digital-temperature-sensor-module","provider":"Compoden","version":"1.0","type":"link"}