Making a deafening piezo buzzer is harder than it seems

Since I was a kid, when dissecting toys, I would find these disc shaped components called piezo transducers or speakers, which were responsible for producing the beeps, melodies and what not, emitted by the toys.

I would often play with these, and try to connect to DC supplies or audio outputs from other devices, but was always frustrated with the sound never being nearly as loud as that produced in the original device.

Reverse engineering the Laotie Ti30 scooter LCD display - part 3 - Encryption Broken!

 

 

In the previous post I had the chance of discovering and documenting most of what there is to learn about the communication between the LCD unit and the master ESC (speed controller) that drives the e-Scooter rear motor.

Reverse engineering the Laotie Ti30 scooter LCD display - part 2

Most e-Scooters and other Electric Vehicles have some form of Electronic Speed Controller (ESC) which is responsible for delivering a power signal that will spin motors at the desired speed. The most common type of motors today are of the BLDC type (Brushless DC motors), which are typically driven by a 3-phase current.

Reverse engineering the Laotie Ti30 scooter LCD display

One thing about these types of electric vehicles is that there is very limited care for normalisation, when it comes to allow different components to interoperate. Especially in respect to the digital communication between the parts of the system, one cannot expect any baseline currently.

Exercising the right to repair - DYI fixing a Volkswagen Polo 6C windscreen wiper stalk (no parts replaced)

I just went on holidays and did a road trip. Because Murphy is always lurking, I was taken by surprise with runaway window wipers. No matter what position of the wiper stalk, these would run in intermittent mode all the time, as long as the ignition would be on.