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Espressif ESP32-C3-LCDKit
ESP32-C3 board with integrated display support - ideal for UI-centric IoT prototypes and HMI panels.
ESP32-C3
RISC-V MCU
160MHz
clock
4MB
flash
400KB
SRAM
22· 5 ADC
GPIO
BLE 5.0+ WiFi
radio
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 involvementA0PWMA1PWMA3PWMPWM
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| A2 | GPIO2 | Must be held high during boot (if low on reset, normal flash boot may fail) | Strapping |
| A4 | MTMS | Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants | JTAG |
| PWM | MTDI | Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants | JTAG |
| PWM | MTCK | Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants | JTAG |
| PWM | MTDO | Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants | JTAG |
| PWM | GPIO8 | Must be held high during reset (if low, UART flashing/boot may not work) | Strapping |
| PWM | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | Strapping |
| PWM | U0RXD | Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs | UART |
| PWM | U0TXD | Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing | UART |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| PWM | VDD_SPI | By default powers the SPI flash; only configurable as GPIO if the flash is powered externally (not recommended otherwise) | Flash |
| PWM | SPIHD | Connected to flash HOLD#; not recommended for other use as it’s reserved for flash communication | Flash |
| PWM | SPIWP | Connected to flash WP#; not recommended for other use (used to interface with SPI flash) | Flash |
| PWM | SPICS0 | Dedicated chip-select for SPI flash memory; cannot be repurposed for general I/O | Flash |
| PWM | SPICLK | Dedicated clock line for SPI flash; cannot be used as general GPIO without interfering with flash | Flash |
| PWM | SPID | Used for SPI flash data transfer (data-out from flash); not available for other functions | Flash |
| PWM | SPIQ | Used for SPI flash data transfer (data-in to flash); not available for other functions | Flash |
| PWM | USB_D- | By default connected to on-chip USB Serial/JTAG controller; to use as GPIO it must be reconfigured from its USB function | USB |
| PWM | USB_D+ | By default connected to on-chip USB Serial/JTAG controller; not available for GPIO use unless USB functionality is disabled or remapped | USB |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes 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…
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 minutes1
Connect over USB
Native USB - shows up as a port right away, no driver needed. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
The onboard LED on GPIO0 blinks - swap the pin if your board's LED differs.
Set these in Tools · leave everything else at default
Arduino IDE 2.x — Tools Copy
Board: "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)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: 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
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32C3 Dev Module
// blink the onboard LED
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH); delay(500);
digitalWrite(0, LOW); delay(500);
}board to selectesp32-c3-devkitm-1⧉ copy
[env:esp32-c3-lcdkit]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600Find it: PlatformIO Home ▸ Boards, search
esp32-c3-devkitm-1 — or type it after board =.board to selectesp32-c3-devkitm-1⧉ copy
esp32:
board: esp32-c3-devkitm-1
variant: esp32_c3_lcdkit
framework:
type: esp-idf
# blink - GPIO0
output:
- platform: gpio
pin: 0
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32-c3-devkitm-1 (same ids as PlatformIO).esptool doesn't pick board settings — a prebuilt .bin already has them baked in. This is just the raw flash command.
esptool.py --chip esp32c3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-C3Compute
MCU
ESP32-C3 · RISC-V
Clock
160 MHz
SRAM · Flash
400 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
22 · 5
UART · I²C · SPI
2 · 1 · 3
PWM
6 channels
Power
USB
USB-C
Serial
Native (CDC)
Boot address
0x0
Display
Screen
LCD · 1.28" · 240x240
Driver
GC9A01
Touch
No
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
The Espressif ESP32-C3-LCDKit uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
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 pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
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