Espressif ESP32-C3-LCDKit
ESP32-C3 board with integrated display support - ideal for UI-centric IoT prototypes and HMI panels.
Espressif ESP32-C3-LCDKit Pinout
22 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | A0PWM | safe | adc | |
| 2 | 1 | A1PWM | safe | adc | |
| 3 | 2 | A2PWM | strapping | adc | |
| 4 | 3 | A3PWM | safe | adc | |
| 5 | 4 | A4PWM | strapping | adc | |
| 6 | 5 | PWM | strapping | - | |
| 7 | 6 | PWM | strapping | - | |
| 8 | 7 | PWM | strapping | - | |
| 9 | 8 | PWM | strapping | - | |
| 10 | 9 | PWM | strapping | - | |
| 11 | 10 | PWM | safe | - | |
| 12 | 11 | PWM | strapping | - | |
| 13 | 12 | PWM | strapping | - | |
| 14 | 13 | PWM | strapping | - | |
| 15 | 14 | PWM | strapping | - | |
| 16 | 15 | PWM | strapping | - | |
| 17 | 16 | PWM | strapping | - | |
| 18 | 17 | PWM | strapping | - | |
| 19 | 18 | PWM | uart | - | |
| 20 | 19 | PWM | uart | - | |
| 21 | 20 | PWM | uart | - | |
| 22 | 21 | PWM | uart | - |
Start with these
4 pins with no boot or system involvementFreely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
9 pins · 9 things to knowA2GPIO2 Strapping pin, but it does not select the boot mode - GPIO9 does. Espressif only recommend pulling it up against reset-time glitches. Floating by default. Strapping
A strapping pin: Espressif recommend an external pull-up against glitches at reset, so avoid heavy capacitive loads or a strong low drive here. It does not put the chip into download mode (that is GPIO9).
A4GPIO4 Bootstrapping pin; JTAG TMS; Flash data (FSPIHD in internal-flash models) JTAG
Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants
PWMGPIO5 Bootstrapping pin; JTAG TDI; Flash data (FSPIWP in internal-flash models) JTAG
Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants
PWMGPIO6 Bootstrapping pin; JTAG TCK; Flash clock (FSPICLK in internal-flash models) JTAG
Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants
PWMGPIO7 Bootstrapping pin; JTAG TDO; Flash data (FSPID in internal-flash models) JTAG
Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants
PWMGPIO8 Bootstrapping pin (needs HIGH at reset); also gates ROM boot message printing (UART_PRINT_CONTROL efuse) Strapping
Must be held high during reset (if low, UART flashing/boot may not work)
PWMGPIO9 Bootstrapping pin; selects boot mode (HIGH = SPI flash boot, LOW = UART download) Strapping
Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode)
PWMGPIO20 UART0 RXD (default serial input) UART
Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs
PWMGPIO21 UART0 TXD (default serial output) UART
Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing
Only if you know the tricks
9 pins · 9 things to knowPWMGPIO11 Flash power supply pin (VDD_SPI) - can become GPIO11 if not used for flash power Flash
By default powers the SPI flash; only configurable as GPIO if the flash is powered externally (not recommended otherwise)
PWMGPIO12 Quad-SPI flash data line (HOLD# signal) Flash
Connected to flash HOLD#; not recommended for other use as it's reserved for flash communication
PWMGPIO13 Quad-SPI flash data line (WP# signal) Flash
Connected to flash WP#; not recommended for other use (used to interface with SPI flash)
PWMGPIO14 Quad-SPI flash chip select (CS#) Flash
Dedicated chip-select for SPI flash memory; cannot be repurposed for general I/O
PWMGPIO15 Quad-SPI flash clock (SCLK) Flash
Dedicated clock line for SPI flash; cannot be used as general GPIO without interfering with flash
PWMGPIO16 Quad-SPI flash data line (MISO/IO1) Flash
Used for SPI flash data transfer (data-out from flash); not available for other functions
PWMGPIO17 Quad-SPI flash data line (MOSI/IO0) Flash
Used for SPI flash data transfer (data-in to flash); not available for other functions
PWMGPIO18 USB D- line (USB Serial/JTAG interface) USB
By default connected to on-chip USB Serial/JTAG controller; to use as GPIO it must be reconfigured from its USB function
PWMGPIO19 USB D+ line (USB Serial/JTAG interface) USB
By default connected to on-chip USB Serial/JTAG controller; not available for GPIO use unless USB functionality is disabled or remapped
The Espressif ESP32-C3-LCDKit pinout brings out 22 GPIO pins - every one of them usable in your project.
On the analog side there are 5 ADC-capable pins for sensors and battery monitoring.
If you want zero surprises, A0, A1, A3 and PWM are free of any such role - the safest first picks. 9 of the exposed pins carry boot-time or system duties on the ESP32-C3 (A2, A4, PWM and 6 more).
Getting started
flash your first firmware in ~2 minutesBoard: ESP32C3 Dev Module USB CDC On Boot: Enabled Flash Size: 4MB (32Mb) Flash Mode: DIO Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) Upload Speed: 921600
// toggle GPIO0 - wire an LED and resistor to it
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH); delay(500);
digitalWrite(0, LOW); delay(500);
}[env:esp32-c3-lcdkit]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32-c3-devkitm-1 - or type it after board =.esp32:
board: esp32-c3-devkitm-1
variant: esp32c3
framework:
type: esp-idf
# blink - GPIO0
output:
- platform: gpio
pin: 0
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32-c3-devkitm-1 (same ids as PlatformIO).esptool.py --chip esp32c3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32-C3 · vs other ESP32 chips →About this board
At its core is the ESP32-C3 - a single-core RISC-V and the budget low-power pick.
Expect to pay about $19.00 - above the ~$10 typical for ESP32-C3 boards.
22 GPIO are broken out - more than most ESP32-C3 boards, so the pin budget is rarely the constraint.
Onboard you'll find an LCD 1.28" 240x240 display, a speaker, an amplifier (NS4150), an addressable RGB LED (GPIO8), an IR transceiver, a rotary encoder and Reset buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-C3 boards.
The ESP32-C3-LCDKit is a development board designed for evaluating and verifying ESP32-C3 screen applications. It consists of a mainboard and a subboard, featuring a 1.28” LCD screen with SPI interface and 240x240 resolution. The mainboard integrates the ESP32-C3-MINI-1 module and provides ports for connection to the LCD subboard. Additional features include an RGB LED, speaker, rotary encoder switch, and infrared transmitter and receiver.
Where to buy
prices are typical street pricesResources
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