Remember version 2 of this PCB? I've redesigned the board in order to get better results. In this post we can see the main changes I've made to the PCB. First of all the size is a lot smaller than the old version 2. But in order to make the PCB smaller I had to remove a few components. For example, the chip will be programmed just once after we know that the code works. So there is no need for an USB connecter as the old board had. Also, if there is no USB programming, we don't need the FTDI programer neither. So that just made possible a smaller PCB.
At the same time, the new code that I've implemented won't need a buzzer. Thus new code could create sounds using the brushless motor as a speaker so in this way I was able to remove the buzzer and have more space.