Temperature Data Logger

A temperature data logger, is a portable measurement device that is able to recording temperature over a defined period of time automatically. The data can be retrieved and viewed after it has been recorded.

in this device the temperature will record every one minutes in CSV file.

1- Arduino Nano.

2- SD card Module.

3- SD Card.

4- RTC Module DS1307 (provide date and timekeeping) .

5- LCD 16*2.

6- LM35 temperature Sensor.

7- AH44E hall effect sensor (Qty=2).

8- 2* 3.7 Volt Lithium Ion Battery (I get it from used laptop battery).

9- Breadboard or PCB and wires.

10- PVC Electric Pipe and Box.

11-Female & male DC Power Connector.

Connect the circuit as shown in the picture and make sure that the SD and RTC library working probably.

I suggest you to not connect the battery till you finish all the test ,so instead of that use the power of USB port .

Remember the battery will provide the circuit with 7.4 volt (3.7 *2) ,so it should be connected to Vin pin in arduino and arduino module will provide 5 volt to other module.

the other pictures showing how to connect linear hall effect sensor ,it work like a switch but instead of pushing a button the output of the sensor will ramp up to the source 5v when the north side of a magnet approaches the face of the sensor and it will drop to ground when south pole of a magnet approaches the face of the sensor.

I connect two sensors ,one to reset arduino and the other one for LCD back-light.

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Note that you can download the RTC library from below link and you can set the clock using library example.

https://github.com/adafruit/RTClib

The Code attached .

follow the pictures to make battery holder.

ATTENTION!!! >>>

Lithium-Ion batteries are extremely dangerous and short circuit may cause fire ,so be careful when dealing with these batteries and I suggest to connect protection fuse or protection circuit .

Please Read Safety Hazards of Batteries before start this step.

http://www.nrel.gov/education/pdfs/lithium-ion_bat...

To protect the LCD I used mobile screen protector.

Open the file in Excel and insert the results in the line chart to get the attached chart.