LM35 Temperature Sensor Module Analog

Description

The LM35 Analog Temperature Sensor Module is one of the most popular and reliable thermal sensors used in DIY electronics, educational projects, and industrial prototyping. Unlike digital sensors that require complex libraries to decode signals, the LM35 outputs a straightforward analog voltage that is strictly proportional to the ambient Celsius temperature.

Available at Tomson Electronics, this module comes pre-mounted on a convenient breakout board with a standard 3-pin interface, making it incredibly easy to wire up to an Arduino, ESP32, or any microcontroller with an ADC (Analog-to-Digital Converter). It boasts a linear scale factor of +10mV per degree Celsius and is calibrated directly in Celsius, eliminating the need to strip away large constant voltages from the output to obtain accurate readings.

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Specifications

• Sensor IC: LM35 (Typically LM35DZ)
• Output Type: Analog Voltage
• Operating Voltage: 4V to 30V DC (5V recommended for microcontrollers)
• Measurement Range: 0°C to 100°C (Module typical range)
• Linear Scale Factor: +10mV / °C
• Accuracy: ±0.5°C (at +25°C)
• Pinout: 3 Pins (VCC, GND, OUT/Signal)

Applications

• Environmental Monitoring: Creating indoor climate logging stations to track room temperatures over time.
• DIY Aquarium Monitors: Building custom temperature tracking systems for sensitive freshwater aquascapes and shrimp colonies (note: the PCB must be housed outside the water or appropriately waterproofed).
• Thermal Management: Triggering a relay to turn on an EC cooling fan when an electronics enclosure or server rack exceeds a specific temperature.
• Educational Prototyping: An excellent introductory sensor for teaching students how to read analog voltages and perform basic data conversion in code.

Frequently Asked Questions (FAQ)

Q: Do I need a specific library to use this with my Arduino?
A: No! Because the LM35 outputs a simple analog voltage, you do not need any specialized libraries. You can read the pin using a basic analogRead() function and convert the voltage to temperature with simple math. For a 5V Arduino, the formula is generally: Temperature = (analogRead(A0) * (5.0 / 1023.0)) * 100;.

Q: Can I use this sensor to measure negative temperatures (below 0°C)?
A: While the bare LM35 IC is technically capable of measuring negative temperatures (down to -55°C), it requires a specific negative voltage biasing circuit. This basic 3-pin module configuration is designed for single-supply positive voltage, so it is meant to read from 0°C upwards.

Q: Is this sensor waterproof?
A: No. The LM35 IC is exposed, and the PCB components will short out if submerged. If you need a waterproof temperature sensor for liquid submersion, you should look into a sealed probe like the DS18B20.

Package Includes

• 1 × LM35 Analog Temperature Sensor Module