A coin‑operated charging kiosk allows users to charge their mobile phones by inserting a coin. The controller validates the coin, starts a timed charging session (e.g., 15 minutes per ₹10 coin), and powers multiple protected USB/Type‑C ports. The system includes over‑current, short‑circuit, and over‑voltage protection to keep devices safe. It’s perfect for public places where unattended, pay‑per‑use charging is needed.

Parts Used:

1. Microcontroller (Arduino/ESP32) – coin read, timing, and control
2. Coin Acceptor Module (programmable, multi‑coin support)
3. Power Supply Unit (SMPS 12 V/24 V as required)
4. DC–DC Buck Converters (5 V USB / 9–12 V fast‑charge capable, QC/PD modules as needed)
5. USB‑A / USB‑C Charging Ports (with E‑marker/QC/PD where applicable)
6. MOSFET/Relay Board – switches each port ON/OFF per session
7. Display & UI – 16×2 LCD/OLED + LEDs + buzzer (timer & status)
8. Keypad/Buttons – start/cancel, service menu
9. Enclosure/Kiosk Cabinet – metal/ABS with lock & ventilation
10. Protection – fuses, polyfuse, TVS diodes, over‑current/short‑circuit protection
11. Real‑Time Clock (optional) – accurate timing & audit logs
12. SD Card/EEPROM – store revenue/session counts
13. Thermal Printer (optional) – receipt/ticket
14. UPS/Battery Backup (optional) – continue session during brief power cuts