Overheat Detector Alarm/Switch
The LM35 temperature sensor is a well-known device used for temperature sensing applications. It operates over a temperature range of -55°C to 150°C and outputs a voltage that is directly proportional to the temperature in degrees Celsius. This characteristic makes it particularly useful for interfacing with analog-to-digital converters (ADCs) and microcontrollers.
In a typical application circuit using the LM35, the sensor is powered by a voltage supply, usually between 4V and 30V. The output voltage of the LM35 is 10 mV per degree Celsius, allowing for straightforward interpretation of the temperature reading. For instance, at 25°C, the output voltage would be 250 mV.
The circuit may include additional components such as resistors for signal conditioning, capacitors for noise filtering, and operational amplifiers to amplify the output signal if required. A common configuration involves using a non-inverting amplifier to boost the output voltage, which can improve the resolution of the temperature reading when interfaced with an ADC.
To ensure accurate readings, the circuit should also implement proper thermal management. This can include minimizing thermal lag by placing the sensor in a location that accurately reflects the temperature of the environment being monitored. Additionally, the PCB layout should consider the placement of the LM35 to avoid interference from other components and ensure a stable ground reference.
In summary, the LM35 temperature sensor circuit is designed to provide precise temperature measurements with a simple linear output, making it suitable for a wide range of applications in environmental monitoring, HVAC systems, and industrial processes. Proper design considerations, including power supply, signal conditioning, and thermal management, are crucial for achieving reliable performance.At the heart of this circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional o.. 🔗 External reference
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