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PROJECTS ArduinoGravityIoT

How to make a Fridge Data Recorder

DFRobot May 23 2019 570

This project is from hackster.io.

Records temperature data and informs admin if there is an anomaly.

Things used in this project

Hardware components
Gravity: Analog LM35 Temperature Sensor For Arduino
Bolt IoT Bolt WiFi Module
Jumper wires (generic)

Software apps and online services
Microsoft Visual Studio 2015
Bolt IoT Bolt Cloud


Usually We put lots of important stuffs in Fridge and we do care about its Hygene.

Some Food and breveages are quite sensitive towards temperature change and corrode easily.

In this project we came up with an idea to alert admin whenever there is any drastic change and fall in temperature of fridge.


Zscore Analysis: -A z-score is the number of standard deviations from the mean a data point is. But more technically it’s a measure of how many standard deviations below or above the population mean a raw score is. A z-score is also known as a standard score and it can be placed on a normal distribution curve. Z-scores range from -3 standard deviations (which would fall to the far left of the normal distribution curve) up to +3 standard deviations (which would fall to the far right of the normal distribution curve). In order to use a z-score, you need to know the mean μ and also the population standard deviation