Elegoo Smart Robot Car V4.0 – IR Remote Control + OLED Speed Display

Controls the car via the included IR remote and displays the current speed state on a 1.3" SH1106 OLED over I2C.

IR Remote Mapping

Button	Action
▲ UP	Move forward
▼ DOWN	Move backward
Any other key (OK, 1-9, etc.)	Stop
Hold any button	Repeats ignored, maintains current state
No signal for 2s	Safety auto-stop

Both remote variants (Type A and Type B) are supported.

Pin Mapping

Arduino Pin	Function	Connected To
5	PWMA	Right motor speed (PWM)
6	PWMB	Left motor speed (PWM)
7	AIN1	Right motor direction
8	BIN1	Left motor direction
3	STBY	Motor standby (HIGH = enabled)
9	IR input	IR receiver sensor
A4 (SDA)	I2C data	OLED SDA
A5 (SCL)	I2C clock	OLED SCL

Wiring

• Motor driver: TB6612 (or DRV8835 — same pinout for this sketch)
• OLED: 1.3" SH1106 128×64, I2C interface
• IR receiver: Connected to pin 9, power (5V) and GND

Display

The OLED shows:

    FORWARD / REVERSE / STOPPED
    ┌──────────────────────────────┐
    │███████████████               │  ← speed bar
    │ Speed: 200                   │
    └──────────────────────────────┘

The display updates instantly on every state change.

Project Structure

car/
├── platformio.ini              # Uno, U8g2 dependency
├── src/
│   └── main.cpp                # Main program
├── lib/
│   ├── IRremote/               # Elegoo's IRremote library
│   │   ├── IRremote.h
│   │   ├── IRremoteInt.h
│   │   └── IRremote.cpp
│   └── README
└── ELEGOO Smart Robot Car Kit V4.0 2023.02.01/
    └── ... (official Elegoo reference code & docs)

Build & Upload

pio run -t upload

Requires PlatformIO.

Resource Usage

	Used	Total
Flash	17.8 KB (55%)	32 KB
RAM	1.8 KB (89%)	2 KB