Smart Universal Remote with Learning Function and Google Assistant Support

The Smart Universal Remote is powered by an ESP32-WROOM-32 microcontroller integrated with a robust power management and charging subsystem. Portable power is supplied by a dual 18650 lithium-ion battery setup housed in a dedicated 2S holder, monitored and safeguarded by an HY2120CB 2S battery protection IC and complementary 8205A N-Channel and AO3401 P-Channel MOSFETs to prevent overcharge, over-discharge, and short-circuit conditions. Recharging is handled via a Micro USB connector paired with a TP5100 2S Li-Ion charger IC, while an MT3608 boost converter circuit utilizing a 22uH SMD inductor, SS34 diode, and various capacitors steps up the battery voltage to reliably power the logic and peripheral components. Programming and serial communication are facilitated by a CH340C USB-TTL converter IC. For user interaction and interface feedback, the device incorporates an RGB LED 1615 driven alongside an S8050 SMD transistor. The core functionality centers on infrared communication: a VS1838B IR sensor captures incoming infrared signals for the learning function, while high-output 5mm IR LEDs driven through precise current-limiting resistors emit custom control signals. A network of passive components including diverse resistors and filtering capacitors ensures stable analog and digital performance across the custom PCB layout, governed by an SPDT SMD switch for power control. Through its Wi-Fi capabilities, the ESP32 connects to cloud services via Arduino IDE programming, Adafruit IO, and IFTTT to process Google Assistant voice commands and translate them into executed IR sequences.