Body measurements Info

This circuit is developed using lm35 a linear voltage sensor. As a temperature sensor the circuit will read the temperature of the surrounding environment and relay thi temperature to us back in degrees celsius. Temperature is usually measured in centigrade or faraheite. So if lm35 outputs 100 mills volts the equivalent temperature in centigradecelsius will be 10010 10 centigradecelsius. Measure temperature using lm35 and arduino. The output voltage rises by 10mv for every 1 degree celsius rise in temperature.

The arduino can read input from 0 5v. The voltage output of the lm35 increases 10mv per degree celsius rise in temperature. It can measure temperature from 55 degree celsius to 150 degree celsius. Lm35 can measure from 50 degree centigradecelsius up to 150 degree centigradecelsius. The lm35 provides 10mvc degrees and considering that the resolution for human temperature is normally assessed in the range of 01c degrees this means that the noise expected should not exceed 1mv. The lm35 device is rated to operate over a 55c to 150c temperature range while the lm35c device is rated for a 40c to 110c range 10 with improved accuracy.

Avr microcontroller based digital thermometer using lm35 in this project we are going to design a circuit for measuring temperature. Heart beat sensor was used for sensing heart rate. In this project we will demonstrate how to build temperature sensor circuit using a lm35 sensor. The lm35 series devices are available packaged in hermetic to transistor packages while the lm35c lm35ca and lm35d devices are available in the plastic to 92 transistor package. Lm35 is used for the sense body temperature. The lm35 provides 10mvc degrees and considering that the resolution for human temperature is normally assessed in the range of 01c degrees this means that the noise expected should not exceed 1mv.

Lm35 is three terminal linear temperature sensor from national semiconductors. 10 mills volt represent one degree centigradecelsius. The lm35 is an analog linear temperature sensor. Body temperature measurement using lm35 i still find some drawbacks on using analog sensors for remote sensing for that application unless cabling is properly shielded and twisted. Body temperature is a basic parameter for monitoring and diagnosing human health. The ic we will use to measure the temperature is the lm35 ic.

The arduino stores this as a 10bit number 0 1023. Lm35 celsiuscentigrade resolution is 10 mills volt. This means that the output voltage is proportional to the temperature. Lm35 can be operated from a 5v supply and the stand by current is less than 60ua.