Piezo Driver Circuit Design

A project log for Automatic Dog Door Smart Home Interface

Reverse engineering an automatic dog door ultrasonic protocol to control it

KumarKumar 03/04/2021 at 03:350 Comments

Put together a dual-555 circuit in LTSpice to generate a 40 kHz pulse train with a 10 us pulse duration and 25 Hz repeat rate. No Arduinos here!

Schematic without output transistor

Period between pulse trains

Pulse train duration

Pulse train frequency