ESP32-C5-DevKitC-1 v1.2

Quick Reference Pinout Guide

🔌

ESP32 USB (Left)

Native USB on GPIO13/14

USB 2.0 • JTAG Debug

🔌

UART USB (Right) ✓

USB-to-UART Bridge

Use this for programming

GPS Module Wiring - MakerFocus GT-U7

✓ GT-U7 Specifications:

Operating Voltage: 3.6V - 5V (3.3V works perfectly!)
Logic Level: 3.3V or 5V compatible
Baud Rate: 9600 (default)
Compatible with: NEO-6M (uses same NMEA format)
Includes: IPEX active antenna, EEPROM, USB interface

GT-U7 VCC

→

J1 Pin 1 (3V3)

GT-U7 GND

→

J1 Pin 15 (GND)

GT-U7 TXD (data)

→

J3 Pin 8 (GPIO4)

GT-U7 PPS (pulse)

→

J1 Pin 6 (GPIO1)

GT-U7 RXD (optional)

←

J3 Pin 9 (GPIO5)

Left Side (J1)

1

3V3

Power 3.3V → GT-U7 VCC

2

RST

Reset (Active Low)

3

GPIO2

MTMS ⚠ Strapping • I2C_SDA • ADC1_CH1

4

GPIO3

MTDI ⚠ Strapping • I2C_SCL • ADC1_CH2

5

GPIO0

LP_UART_DTRN

6

GPIO1

← GT-U7 PPS • ADC1_CH0

7

GPIO6

ADC1_CH5 • FSPICLK

8

GPIO7

⚠ Strapping • FSPID • SDIO_DATA1

9

GPIO8

SDIO_DATA0

10

GPIO9

SDIO_CLK

11

GPIO10

FSPICS0 • SDIO_CMD

12

GPIO26

⚠ Strapping Pin

13

GPIO25

⚠ Strapping Pin

14

5V

Power 5V In/Out

15

GND

Ground → GT-U7 GND

16

NC

No Connection

Right Side (J3)

1

GND

Ground

2

TX

UART0 TXD • GPIO11

3

RX

UART0 RXD • GPIO12

4

GPIO24

General Purpose I/O

5

GPIO23

General Purpose I/O

6

NC

GPIO15 (used by PSRAM on N8R4)

7

GPIO27

⚠ Strapping • RGB LED

8

GPIO4

← GT-U7 TXD • LP_UART_RXD • ADC1_CH3

9

GPIO5

→ GT-U7 RXD (optional) • LP_UART_TXD • ADC1_CH4

10

NC

No Connection

11

GPIO28

⚠ Strapping Pin

12

GND

Ground

13

GPIO14

USB_D+ • SDIO_DATA2

14

GPIO13

USB_D- • SDIO_DATA3

15

GND

Ground

16

NC

No Connection

Power (3V3, 5V)

Ground (GND)

GPIO Pins

Special (UART, USB)

⚠ Strapping Pins

GPS Connections

⚠ Important Notes

MakerFocus GT-U7: This module works with 3.3V to 5V. Using ESP32's 3.3V pin is perfect and safe!
Antenna: GT-U7 comes with IPEX active antenna - connect it to the module's IPEX connector for best GPS reception.
First GPS fix: Cold start takes 30-60 seconds outdoors with clear sky view. Subsequent fixes are much faster.
Strapping Pins (⚠): GPIO2, 3, 7, 25, 26, 27, 28 control boot behavior. Avoid using for external connections.
For programming: Use the UART USB port (right side). More reliable than native USB.
N8R4 has PSRAM: GPIO15 (J3 Pin 6) is not available - used internally for PSRAM.

Reference: ESP32-C5-DevKitC-1 v1.2 Official Documentation