Schematics

Schematics of ESP32-DIV

The ESP32-DIV integrates multiple components with the ESP32 microcontroller for its wireless capabilities. Below are the key connections. Refer to the ESP32-DIV GitHub repository for detailed schematic files.

 

⚙️ TFT Display + ESP32

ESP32-S3 GPIO	TFT Pin	Description
GPIO 36	SCK / CLK	SPI Clock
GPIO 35	MOSI / SDI / DIN	SPI Data Input
GPIO 37	MISO / SDO	SPI Data Output
GPIO 17	CS	Chip Select
GPIO 16	DC / RS	Data / Command
EN/RESET	RESET	Display Reset
GPIO 7	BL / LED	Backlight Control (SI2302)
3.3V	VCC	Power Supply
GND	GND	Ground

• ILI9341 TFT Display: Connected to the ESP32 for the user interface.
• LED Backlight Control: Managed via a transistor switch (Q3, 8050) with a 1kΩ resistor (R26) at the base. Supports PWM for brightness adjustment if implemented.

 

🖥️ XPT2046 + ESP32

ESP32-S3 GPIO	XPT2046 Pin	Description
GPIO 36	T_CLK / SCK	SPI Clock
GPIO 35	T_DIN / MOSI	SPI Data Input
GPIO 37	T_DO / MISO	SPI Data Output
GPIO 18	T_CS	Touch Chip Select
-	T_IRQ	Touch Interrupt / Pen Detect
3.3V	VCC	Power Supply
GND	GND	Ground

• XPT2046: Touch controller for the TFT display, interfaced with the ESP32 for touch input.

 

📡 NRF24 Modules - Connections to ESP32

ESP32 GPIO	NRF24 PIN	DESCRIPTION
GPIO 12	SCK	SPI Clock (Shared)
GPIO 11	MOSI	SPI Data Input (Shared)
GPIO 13	MISO	SPI Data Output (Shared)
GPIO 4	CSN (NRF24 #1)	Chip Select
GPIO 15	CE (NRF24 #1)	Chip Enable
GPIO 48	CSN (NRF24 #2)	Chip Select
GPIO 47	CE (NRF24 #2)	Chip Enable
GPIO 21	CSN (NRF24 #3)	Chip Select
GPIO 14	CE (NRF24 #3)	Chip Enable
3.3V	VCC	Power Supply (3.3V ONLY)
GND	GND	Ground

• 3 x NRF24 Modules: Connected to the ESP32 for 2.4GHz operations (scanning, jamming, etc.). Each module uses SPI pins for communication.

 

📻 CC1101 Sub-GHz Transceiver - Connections to ESP32

ESP32 GPIO	CC1101 Pin	Description
GPIO 12	SCK	SPI Clock
GPIO 11	MOSI	SPI Data Input
GPIO 13	MISO	SPI Data Output
GPIO 5	CSN / CS	Chip Select
GPIO 6	GDO0	General Digital Output / Interrupt
GPIO 3	GDO2	General Digital Output
3.3V	VCC	Power Supply (3.3V ONLY)
GND	GND	Ground

• CC1101 Module: Connected to the ESP32 via SPI for Sub-GHz signal capture, replay, and jamming.

 

💾 SD Card - Connections to ESP32

ESP32 GPIO	SD Card Pin	Description
GPIO 12	SCK / CLK	SPI Clock
GPIO 11	MOSI / DI	SPI Data Input
GPIO 13	MISO / DO	SPI Data Output
GPIO 10	CS	Chip Select
GPIO 38	Detect pin / CD	SD card detect pin
3.3V	VCC	Power Supply (3.3V)
GND	GND	Ground

• SD Card Slot: Interfaced with the ESP32 via SPI for storing signals, logs, and firmware files.

 

📤 IR → ESP32 - Connections to ESP32

• IR Receiver → ESP32

ESP32 GPIO	IR RECEIVER PIN	Description
GPIO 21	OUT	IR Signal Output
3.3V	VCC	Power Supply
GND	GND	Ground

 

• IR Transmitter (BC847) → ESP32

ESP32 GPIO	BC847 / IR PIN	Description
GPIO 14	BC847 BASE	IR Signal (via 220R Base Resistor)
GND	BC847 EMITTER	Ground
5V	IR LED ANODE	IR LED Power (with 220R Resistor)
BC847 COLLECTOR	IR LED CATHODE	Low-Side Switching

 

🔊 Buzzer - Connections to ESP32

• Buzzer → ESP32

ESP32 GPIO	BUZZER PIN	Description
GPIO 2	SIGNAL	PWM / Tone Output

 

🚨 NeoPixel - Connections to ESP32

• NeoPixel (WS2812) → ESP32

ESP32 GPIO	NEOPIXEL PIN	Description
GPIO 1	DIN	NeoPixel Data Input

 

🔋 Battery Voltage Divider - Connections to ESP32

• Battery Voltage Divider → ESP32

ESP32 GPIO	SIGNAL	Description
GPIO 2	ADC	Battery Voltage Sense (via Divider)

 

🧲 PN532 RFID/NFC → ESP32 (SPI)

Library: Adafruit PN532 (rfid.cpp). SPI is shared with other peripherals on the same clock/data lines; PN532 uses its own chip select (PN532_SS).

ESP32 GPIO	PN532 pin	Description
GPIO 12	SCK	SPI clock (PN532_SCK)
GPIO 11	MISO	SPI MISO (PN532_MISO)
GPIO 13	MOSI	SPI MOSI (PN532_MOSI)
GPIO 4	SS / CS	Chip select (PN532_SS)
3.3V	VCC	Power
GND	GND	Ground

Build-time overrides: PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS

Note (shared SPI): On ESP32-DIV, SD card and CC1101 typically use SCK 12, MOSI 11, MISO 13 on the same bus. Wire the PN532 to those physical MOSI/MISO/SCK lines; if your copper matches the stock wiki, PN532_MOSI / PN532_MISO should match 11 = MOSI, 13 = MISO regardless of label order in a given snippet—verify against your schematic.

 

🛰️ Neo-6M GPS → ESP32 (UART)

Defaults: HardwareSerial UART2, 9600 8N1 (GPS_UART_NUM, GPS_UART_BAUD in gps.cpp).

ESP32 GPIO	GPS module	Description
GPIO 47	Module TX → ESP RX	NMEA input (GPS_UART_RX)
GPIO 48	Module RX ← ESP TX	Optional commands (GPS_UART_TX)
3.3V or 5V	VCC	Per module rating
GND	GND	Ground

Build-time overrides: GPS_UART_RX, GPS_UART_TX, GPS_UART_NUM, GPS_UART_BAUD

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Build or troubleshoot your ESP32-DIV with these connections. See the Hardware page for component details or the Firmware Upload Guide for setup.