Simple IC LM35 Temperature Sensor Characteristics

LM 35 temperature sensor IC is a IC chip production Natioanal Semiconductor which serves to determine the temperature of an object or space in the form of electric scale, or can also be defined as an electronic component that is used to change the temperature changes are accepted in the electrical wholesale changes. LM35 temperature sensor IC temperature change can change a change in voltage at the output. LM35 temperature sensor IC requires +5 volts DC source voltage and DC current consumption of 60 mA in operation. Physical form LM 35 temperature sensor is an IC chip with packaging that varies, in general packaging LM35 temperature sensor is packaged TO-92 as shown in the figure below.

From the picture above it can be seen that the temperature sensor IC LM35 basically have 3 pin that serves as a source of supply voltage of +5 volts DC, as a result of sensing the output pin in the form of a change in the DC voltage and Vout pin to Ground.

IC LM35 temperature sensor characteristics are:

•     Temperature sensitivity, with linear scaling factor between voltage and temperature 10 mVolt / º C, so it can be calibrated directly in centigrade.
•     Have the accuracy or the accuracy of the calibration is 0.5 º C at 25 º C.
•     Has a maximum operating temperature range between -55 º C to +150 º C. Working at a voltage of 4 to 30 volts.
•     Has current low at less than 60 mA.
•     Have a low self-heating (low-heating) of less than 0.1 º C in still air.
•     Has a low output impedance is 0.1 W for 1 mA load.
•     have Nonlinearities only about ± ¼ º C.

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Transistor Water Sensor Alarm

This water sensor alarm circuit diagram is designed using common electronic components. Thewater sensor alarm circuit may operate an active buzzer, to make a sound when is reached a certain level of water.

Transistor Water Sensor Alarm Circuit Diagram

Because water sensor and control circuit for buzzer are located on the same printed circuit board, indicator, together with 9 V battery and buzzer can be mounted in a compact case.

When water reaches the sensor, the base of T1 is connected to the positive supply terminal. Therefore, T1 and T2 are open, so that buzzer BZ1, will be activated. Sensitivity reduction of the circuit can be done by increasing the value of R2.

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Pressure sensor MPX4100

The pressure sensor (MPX4100) MPX4100 is a pressure sensor that is equipped with signal conditioning circuit and temperature calibrator makes this sensor stable against temperature changes. For this sensor measurement accuracy using micro-machine techniques, thin film metalization and bipolar semiconductor process.

With the signal conditioning circuit, this sensor can connect direct on Analogue to Digital Converter. Signal conditioning circuit generate analog voltage with Full Scale (Full Scale) to 5 Volt. This sensor has the ability to detect the pressure of 15 to 115 kilo Pascal and work under pressure difference between P1 and P2. P1 or Pressure Side consists of gel fluorisilicone that protect it from the objects hard. Pressure sensors on robotic applications are often used as feedback mechanic in which the system microcontroller can detect mechanical condition at the time it. For example to detect strong or weak grip of the robot calculates burden placed on the robot.

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