Required components :

Any arduino board(UNO/pro/mini/nano/duemilanove etc.),

power supply kit,

DHT11(temp. & humidity sensor),

IC DS1307(Real Time Clock),

Crystal 32.768kHz,

3V battery(for RTC back-up),

transformer 6V/200mA,

LCD 16x2,

SD/microSD/MMC card,

card holder,

diode bridge,

zener diode 5V,

capacitor 100uF,

10k resistance(1/4W) x 6,

10k variable resistance x 2,

toggle switch x 4

For achieving the value of ac voltage we need a 6V transformer. This transformer is not for the power supply of the project but it is used to measure ac voltage in terms of low secondary voltage as shown in the figure below. Secondary voltage is rectified, filtered and limited to a range of 5 Volts with a zener diode then it is applied to the analog pin 0(AN0/pin14) of the arduino board. 

arduino data measurement

For achieving the value of temperature we are using DHT11 sensor which provides a single data line. It is connected to analog pin 1(AN1/pin15) of the arduino board.

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SG Templetes by Sameer Gupta