This project revolves around a box that can be opened remotely over a Wi-Fi connection. The box hosts a server locally and waits for a message to transition from the CLOSED to the OPEN state, or OPEN to CLOSED if it has transitioned previously. This message will be sent over Wi-Fi, from a computer through a local webpage.

Initially, the box is in the CLOSED state, where the motor isn't being acted upon, it's display has the “LOCKED” text, IP address and the box is considered closed. After it receives the specific Wi-Fi message, the box plays a sound, the motor activates to lift up the cover of the box and the displayed message changes to “UNLOCKED”. A second message will revert to the initial state.

• ESP32 Devkit with ESP-WROOM-32 XX5R69
• Servo motor SG90
• Active buzzer 3V
• OLED 0.96” I2C Display
• USB cable (for developing)
• Breadboards
• Dupont cables
• Accumulator 3,7V - 5000 mAh

• Microcontroller: WiFi, PWM, I2C, serial communication, low power (about 100 mA) and cheap, with breadboard ready pins.
• Servomotor: Used with PWM at pin GPIO23 to lift the lid. Uses at most 500 mA but only when acted upon.
• Display: Shows the IP of the server and also the state of the box. SDA is connected to GPIO21 and SCL TO GPIO22. Low power, uses less than 50 mA.
• Active buzzer: Makes sound when the box is transitioning to the open state, connected to GPIO14 (any pin that can be set from low to high would do). Uses around 50mA.
• Battery: Supplies the whole circuit. Has enough power so that the servo can function multiple times. It's also very efficient in the idle state, as only the display and microcontroller are active most of the time.

Export to PDF