It offers the same connectivity and specs of the Arduino Uno board in a smaller form factor. Using all this data we can easily programmatically calculate the calories burnt by the person and when we connect the watch to the smartphone using Bluetooth we can use an app to view all the data or also view the data in the watch itself.The Arduino Nano is an open-source breadboard-friendly microcontroller board based on the Microchip ATmega328P microcontroller (MCU) and developed by and initially released in 2008. Using the accelerometer module we will track steps and using these we will calculate the distance travelled. This is a great technique to keep only a part of the watch functioning all the time instead of the whole watch itself! What we will do here is that we will be using an ATtiny85 chip that uses very little power and we will keep that powered forever while barely consuming any battery! We will also connect the accelerometer module to the ATtiny chip so it keeps tracking the steps forever and whenever the Arduino board is powered it will ask the ATtiny board for all of the data. You might think that if the watch keeps killing the power continuously then how will the Arduino board retain the step-tracking data! For that, I have a great solution to offer. This way we can get the watch to function seamlessly! So when the user presses the power button it will automatically go off after a designated time, say 5 seconds. So for that what we will do is we will use a self-kill method in which we will programmatically tell the Arduino to get disconnected from the power source. We obviously cannot keep the watch powered for all the time because we need to preserve battery at all costs. The red piece is the top piece and the black piece is the bottom one. In the images I have attached below, you can see two parts. It has a top piece which has 5 sides and a bottom plate which I have designed in a way that it can snap-fit to the top piece very easily and there is no need of glueing or taping anything so it looks cleaner. You can use any straps on the watch that have a similar mechanism. There are also two small protrusions on the side of the watch for the straps. There are four cutouts in the design for: I will add the design files in the description below. I have attached my designs for you to check out. I have made a very easy design in a 3D design software and you can obviously get your hands dirty and make your own design for the body of the smartwatch! I wanted to give it a different look so I did not even curve the edges and am making it in a simple cuboidal shape. Now we have to design the body of the smartwatch. This was a little info about the project that we are going to work on. With the same components and in some iterations in the code and the app, we can also easily track messages and calls received on the phone through the smartwatch! The watch will also have a heart rate measuring sensor in it which will be able to measure your pulse and I have tried it out. It can count the steps, distance and the calories burnt using an accelerometer module. The watch will have Bluetooth functionality and will be connected to an app that can be used to track data. The watch will be activated by using a push-button present at the side of the watch. This was we can keep the watch completely personalised according to your need. I have designed the body of the watch in a 3d design software and you can easily get it 3d-printed anywhere. This will also have a USB port in it to charge the battery! We will use a USB battery charging module for charging the battery. I am going to use a 160 mAh Li-Po (Lithium Polymer) battery which will easily be able to power the watch on regular use for at least a week which is quite good enough. I have chosen the Arduino Nano and not the more commonly used Arduino UNO because the Nano features a Surface Mount chip so it's much more compact and in this project, space is key because we need to fit all the components in the least space possible. We are going to design and get a custom PCB fabricated which will be the motherboard of our watch housing the main circuit and the brain of the watch ATmega 328P which we will salvage from an Arduino Nano board. Hi all, in this instructable you will see how a smartwatch can be made using an Arduino board and a few other components.
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