I need a tachometer to calculate some mechanisms. For example, to calculate the speed of a robot vacuum cleaner, you need to know the rotation speed of the electric motor and, based on this, calculate the gear ratio of the gearbox.
Soon February 14, Valentine's Day, the Christmas garland on the address LEDs still hangs on the window. I decided to diversify it a bit. I wrote a simple script and added a colorful heart to the firmware.
This cool garland is assembled according to the design of Alex Hyvera using Arduino and an address LED strip. The garland has many interesting effects, a running text, several games and the ability to control all this from a mobile phone.