SmartCube

SmartCube is a compact and customizable desk toy using the ESP8266 D1 Mini. It features a rechargeable power supply, three input buttons, an SSD1306 OLED display for user interface, and a piezo buzzer for sound.

Features

Microcontroller: ESP8266 D1 Mini (WeMos)
Display: SSD1306 OLED (128x64 resolution)
Input: Three push buttons
Sound: Piezo buzzer for audio feedback
Power: 14250 rechargeable battery with TP4056 charging module
Case: 3D-printable design included in /hardware directory

Bill of Materials

Component	Quantity	Description	Notes
ESP8266 D1 Mini	1	Microcontroller module	Base of the SmartCube
SSD1306 OLED Display	1	128x64 resolution, I2C interface	Ensure proper wiring for SDA/SCL
14250 Rechargeable Battery	1	Lithium-ion battery	For powering the cube
TP4056 Module	1	Charging and protection circuit	For battery management
Push Buttons	3	Tactile push buttons	Used for user input
Piezo Buzzer	1	Active buzzer	Provides audio feedback
Resistors (10kΩ)	3	Pull-down resistors for buttons	Ensures stable button input
Wires / Dupont Connectors	Several	For connections	Ensure reliable wiring
Enclosure	1	3D-printed or custom-made case	For housing the components
2x6mm screw	12	Small screws for seembling the case	Does not have to be exactly 6mm long

Pin Connections

OLED Display Settings

#define SCREEN_WIDTH 128  
#define SCREEN_HEIGHT 64  
#define OLED_RESET -1  
#define FRAMERATE 8

The OLED display is connected via I2C to the D1 Mini:

SDA: D2 (GPIO4)
SCL: D1 (GPIO5)

Buttons and Buzzer

#define PIN_BTN_L 12 // D6  
#define PIN_BTN_M 13 // D7  
#define PIN_BTN_R 15 // D8  
#define PIN_BUZZER 0 // D3

Button Left (PIN_BTN_L): GPIO12
Button Middle (PIN_BTN_M): GPIO13
Button Right (PIN_BTN_R): GPIO15
Piezo Buzzer (PIN_BUZZER): GPIO0

Assembly Instructions

Power Supply Setup:
- Connect the 14250 battery to the TP4056 module for safe charging and protection.
- Wire the output of the TP4056 to the 3.3V pin on the D1 Mini to power the device.
- Connect the 5V output pin from the D1 Mini to the input port on the TP4056 module to enable charging functionality.
OLED Display: Solder connections for SDA (D2, GPIO4) and SCL (D1, GPIO5) to the respective pins on the D1 Mini.
Buttons: Attach each button to the specified GPIO pins with pull-down resistors to ensure reliable input.
Buzzer: Connect the piezo buzzer to GPIO0. Ensure proper polarity. Negative to the GPI00, Positive to 3.3v
Enclosure: Assemble all components in a secure housing. May require some hot glue to keep components in

Demo Code Explanation

The provided demo code demonstrates the main features of the SmartCube, focusing on system initialization, button handling, OLED display output, and WiFi management. Below is a breakdown of its components:

Key Features

WiFi Management:
- The cubeWifiManager class manages WiFi connectivity seamlessly.
- If no known WiFi network is available, it starts a configuration portal and creates an access point (AP), allowing users to connect the SmartCube to a network from another WiFi-enabled device.
- The OLED display shows the access point details, such as the AP name and IP address, making the setup process user-friendly and accessible.
Button Handling:
- Buttons are mapped to specific GPIO pins: PIN_BTN_L (Left), PIN_BTN_M (Middle), and PIN_BTN_R (Right).
- The cubeButtonHandler() function, executed in the loop(), monitors and interprets button presses, differentiating between short and long presses.

Default Button Actions

Right Button:
- Short Press: Turns the OLED display on (if previously off).
- Long Press: Turns the OLED display off, helping conserve power.
Left + Middle Buttons (Simultaneous Long Press):
- Triggers an ESP8266 reboot, effectively restarting the device.

Notes

This is still a work in progress
Ensure all connections are secure to avoid malfunction.
Test the circuit thoroughly before placing it in the enclosure.
Handle the battery with care to prevent damage.

For questions or additional details, feel free to reach out!

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