LM35 Precision Analog Temperature Sensor (TO-92)
LM35 Precision Centigrade Temperature Sensor - Analog Output
The LM35 is a precision integrated-circuit temperature sensor that outputs an analog voltage linearly proportional to the Celsius temperature. No external calibration or trimming is required, achieving typical accuracies of ±0.5°C at room temperature. It is widely used in Arduino, AVR, and PIC projects for reliable temperature monitoring.
Key Specifications
| Specification | Value |
|---|---|
| Supply Voltage | 4V to 30V |
| Output Scale | 10 mV/°C |
| Temperature Range | -55°C to 150°C |
| Accuracy | ±0.5°C (typical) |
| Output Type | Analog voltage |
| Package | TO-92 (3-pin) |
What You Can Build With This
- Digital thermometer with Arduino and a 16x2 LCD display
- Automatic fan speed controller based on ambient temperature
- Overheat alarm for batteries, motors, or enclosed electronics
- Temperature data logger for greenhouse or laboratory monitoring
Compatibility
The LM35 operates from a single supply (4V–30V) and draws only 60 µA, making it compatible with any microcontroller having an analog input, such as Arduino Uno, Nano, ESP32, and Raspberry Pi Pico. It outputs a linear voltage, easily read by 10-bit or 12-bit ADCs. Often paired with 7-segment displays or serial plotters for real-time visualization.
Wiring Notes
Connect the VCC pin to 5V (or 3.3V for reduced self-heating), GND to ground, and the output pin directly to an analog input channel. No pull-up resistors or external components are required. For accurate readings, keep the sensor away from PCB heat sources and provide slight air circulation if measuring ambient air.
Why Buy from Compoden
Every 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.
Is this compatible with Arduino?
Yes, the LM35 works directly with Arduino boards by connecting its output to an analog pin, then using analogRead(). Convert the ADC value to Celsius with: temperature = (analogValue * 5.0 / 1024.0) * 100.
Does it need external calibration?
No, the LM35 is factory-calibrated to produce 10 mV per degree Celsius with ±0.5°C accuracy. For most hobbyist and educational projects, no recalibration is necessary.
What is the difference between LM35 and LM34?
The LM35 outputs temperature in Celsius, while the LM34 outputs in Fahrenheit. Both are analog sensors, but the LM35 is more common for metric-based projects and easier integration with Celsius-referenced software.
📦 Free Setup Handoff Document Included
Every 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.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items