Ad

Sunday, December 26, 2021

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.

Tuesday, December 14, 2021

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.

Saturday, December 11, 2021

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.