Temperature Measurement using Raspberry Pi

After covering the basic raspberry pi tutorials in previous articles, in this project we are designing first application based on the previous tutorials. The first basic application is a Raspberry Pi Temperature Monitor where you can monitor the temperature readings on computer. For this we have interfaced Raspberry Pi with LM35. You can learn more about LM35 temperature sensor, here

As discussed in previous tutorials, there are no ADC channels provided internally in Raspberry Pi. So if we want to interface any analog sensors we need an ADC conversion unit. And in one of our tutorials we have Interfaced ADC0804 chip to Raspberry Pi to read an analog value. So go through it before building this Room Temperature Thermometer.

An Arduino Based Temperature Sensor

This interesting DIY thermometer project uses an Arduino Uno board and LM35 temperature sensor to display current ambient temperature on a 16x2 LCD screen attached with Arduino. This block diagram shows the working of this project.

LM35 temperature sensor is used for sensing environment temperature which gives 1 degree temperature on every 10mV change at its output pin. You can easily check it with voltmeter by connecting Vcc at pin 1 and Ground at pin 3 and output voltage at pin 2 of LM35 sensor. For an example if the output voltage of LM35 sensor is 250m volt, that means the temperature is around 25 degree Celsius.