bluetooth low energy

How would I make a device that can be connected to using bluetooth that does nothing but vibrate on and off that is powered by battery. This needs to be able to fit in a person's hand. I would like to see how small this can be using a chargeable battery and how small it can be using a coin...

Hi guys, I am new here. FYI before I get started, I am not an engineer, designer, programmer, or anything of that nature. I’m just a dude who loves a challenge, and I love diy home projects. Now, I hope this is the right forum to ask this kind of question! So let me get started: I have lately...

Hello! I am currently doing a school project where we are going to design a direction finding system using antennas and an automated robot arm to adjust to angle. From what we have read the most reasonable choice of antenna is either a yagi or parabolic antenna. The robor arm is fairly small...