Sine Wave Electromagnetic Generation Using H-Bridge and Microcontroller

The paper presents a way of accomplishing a non-contact excita-tion by electromagnetic waves generated from a system that in-cludes WiFi microcontroller, H-Bridge and coil. The ESP 32 mi-crocontroller software achieves PWM signal, which follows’ a si-nusoidal shape of variable frequency. The PWM signal drives the H-bridge resulting in a more powerful electric signal that also drives the coil, accomplishing in this way the pseudo-sine electro-magnetic wave. The source code from microcontroller provides variable frequency and working period as well. The main features of the system are 0.5 to 3000 Hz, working periods between 0.1 and 10 seconds, the possibility to achieve more than one working peri-od with standby periods in between.