Nowadays, doing calculations isn’t a problem at all. Powerful calculators can be bought for few Euro or easily installed on phones and computers. However, we decided to turn our Arduino into a calculator because we think it could be a really interesting experiment.
It’s actually a very simple calculator, in fact it can just do the four basic calculations accepting only integer positive numbers. Despite this fact, the sketch is quite complex – and you’ll figure it out on next steps -, but the circuit is pretty easy instead and requires few and common components.