LM35D Precision Analog Temperature Sensor Module

Accurately monitor ambient and surface temperatures with the LM35D Precision Analog Temperature Sensor Module. Centered around the widely trusted Texas Instruments LM35D integrated-circuit sensor, this module provides an analog voltage output directly proportional to the temperature in degrees Celsius ( $10 ext{mV/}^circ ext{C}$ ). Unlike thermistors that require complex non-linear calibration equations, the LM35D is linearly calibrated, requiring no external conversion setup. Powered by $4 ext{V}$ to $30 ext{V DC}$ , it is the perfect solution for microcontrollers like Arduino, ESP32, and Raspberry Pi in environmental monitoring and thermal management projects.

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Tags LM35D Temperature Sensor LM35 Analog Temp Module Linear Temperature Sensor Arduino LM35 Precision Sensor Centigrade Temp Sensor Module LM35 Precision Linear Module

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Product Details :

The LM35D Analog Temperature Sensor Module is a high-precision integrated-circuit temperature sensing board designed to measure temperature directly in degrees Celsius. Because the output voltage is linearly proportional to the Centigrade scale ( $10 ext{ mV per } 1^circ ext{C}$ ), developers can easily convert analog readings into temperature without needing complex mathematical lookup tables or logarithmic Steinhart-Hart formulas.

The LM35D operates with low self-heating (less than $0.08^circ ext{C}$ in still air) to maintain accurate environment readings. Onboard decoupling capacitors ensure stable power supply filtering, reducing signal noise on the analog output line. The module features a simple 3-pin interface ( $V_{CC}$ , $GND$ , and $OUT$ ), making it ideal for rapid prototyping with development boards.

Key Features and Benefits

Direct Linear Scale Calibration: Factory-calibrated directly in degrees Celsius with a linear factor of $+10.0 ext{ mV/}^circ ext{C}$ .
Low Self-Heating Effect: Draws less than $60 mu ext{A}$ , preventing internal power dissipation from distorting temperature readings.
Wide Voltage Supply Compatibility: Operates smoothly across a broad supply range from $4 ext{V DC}$ up to $30 ext{V DC}$ .
Plug-and-Play 3-Pin Header: Easy connections using standard DuPont jumper cables directly to ADC input pins.
Onboard Power Decoupling: Includes bypass capacitors on the module PCB to minimize power rail noise and stabilize output readings.

Technical Specifications

Feature Component	Specification Details
Sensor IC	Texas Instruments LM35D
Measurement Range	$0^circ ext{C to } +100^circ ext{C}$
Accuracy	$pm 0.6^circ ext{C}$ (at $+25^circ ext{C}$ typical)
Scale Factor	$+10.0 ext{ mV/}^circ ext{C}$
Operating Voltage ( $V_{CC}$ )	$4.0 ext{V DC to } 30.0 ext{V DC}$
Current Consumption	$< 60 mu ext{A}$
Output Type	Analog Voltage ( $0 ext{V}$ at $0^circ ext{C}$ , $1.0 ext{V}$ at $100^circ ext{C}$ )
Output Impedance	$0.1 Omega$ for $1 ext{mA}$ load

Wiring & Output Calculation Guide

1. Pin Description:

Header Pin	Label	Function / Connection
VCC	Power Supply	Connect to $5 ext{V DC}$ (or $4 ext{V}-30 ext{V}$ )
OUT / SIG	Analog Signal Output	Connect to Microcontroller ADC Pin (e.g., A0 on Arduino)
GND	Ground	Connect to System / Microcontroller Common Ground ( $GND$ )

2. Conversion Formula:

To convert the analog voltage reading from your microcontroller's ADC into temperature in Celsius ( $^circ ext{C}$ ):

ext{Voltage (mV)} = rac{ ext{ADC Reading}}{ ext{ADC Resolution}} imes ext{Reference Voltage (mV)}

ext{Temperature }(^circ ext{C}) = rac{ ext{Voltage (mV)}}{10 ext{ mV/}^circ ext{C}}

Example (Arduino 10-bit ADC at 5V reference): If the ADC reading is $51$ :

$ext{Voltage} = rac{51}{1023} imes 5000 ext{ mV} pprox 249.2 ext{ mV}$

$ext{Temperature} = rac{249.2 ext{ mV}}{10 ext{ mV/}^circ ext{C}} = 24.92^circ ext{C}$

Applications

Environmental & Weather Stations: Room temperature tracking and ambient climate logging.
Battery & Power Supply Thermal Monitoring: Over-temperature protection for LiPo chargers and power supplies.
HVAC & Smart Home Systems: Thermostat regulation and fan speed control based on real-time temperature.
Educational STEM Experiments: Teaching analog-to-digital conversion concepts with microcontrollers.