ESP32 Lite V1.0.0
Generic ESP32 Lite V1.0.0 board with Wi-Fi, BLE, MicroPython support, and Micro-USB/Type-C - Arduino IDE compatible.
Pinout
26 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 5V | power | - | 5V power input for the board |
| 2 | - | GND | ground | - | Ground connection |
| 3 | - | 3V33.3V | power | - | 3.3V power output |
| 4 | 0 | IO0GPIO0 | strapping | adc | GPIO, ADC |
| 5 | 2 | IO2GPIO2 | strapping | adc | GPIO, ADC |
| 6 | 4 | IO4GPIO4 | strapping | adc | GPIO, ADC |
| 7 | 5 | IO5GPIO5 | strapping | - | GPIO |
| 8 | 12 | IO12GPIO12 | strapping | adc | GPIO, ADC |
| 9 | 13 | IO13GPIO13 | strapping | adc | GPIO, ADC |
| 10 | 14 | IO14GPIO14 | strapping | adc | GPIO, ADC |
| 11 | 15 | IO15GPIO15 | strapping | - | GPIO |
| 12 | 16 | IO16GPIO16 | strapping | - | GPIO |
| 13 | 17 | IO17GPIO17 | strapping | - | GPIO |
| 14 | 18 | IO18GPIO18 | safe | - | GPIO |
| 15 | 19 | IO19GPIO19 | safe | - | GPIO |
| 16 | 22 | IO22GPIO22 | safe | - | GPIO |
| 17 | 23 | IO23GPIO23 | safe | - | GPIO |
| 18 | 25 | IO25GPIO25 | safe | adc | GPIO, ADC |
| 19 | 26 | IO26GPIO26 | safe | adc | GPIO, ADC |
| 20 | 27 | IO27GPIO27 | safe | adc | GPIO, ADC |
| 21 | 32 | IO32GPIO32 | safe | adc | GPIO, ADC |
| 22 | 33 | IO33GPIO33 | safe | adc | GPIO, ADC |
| 23 | 34 | IO34GPIO34 | strapping | adc | GPIO, ADC |
| 24 | 35 | IO35GPIO35 | strapping | adc | GPIO, ADC |
| 25 | 36 | IO36GPIO36 | strapping | adc | GPIO, ADC |
| 26 | 39 | IO39GPIO39 | strapping | adc | GPIO, ADC |
Start with these
9 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
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| IO0 | GPIO0 | Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode. | Strapping |
| IO2 | GPIO2 | If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure. | Strapping |
| IO4 | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
| IO5 | GPIO5 | Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot. | Strapping |
| IO12 | MTDI (GPIO12) | Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used. | Strapping |
| IO13 | MTCK (GPIO13) | Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed. | Other |
| IO14 | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
| IO15 | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| IO34 | GPIO34 | Cannot be used as output (no drive capability); only suitable for analog/digital input. | Other |
| IO35 | GPIO35 | Cannot be used as output; only suitable for input. | Other |
| IO36 | GPIO36 (SENSOR_VP) | Cannot be used as output; only suitable for input (e.g., analog read). | Other |
| IO39 | GPIO39 (SENSOR_VN) | Cannot be used as output; only suitable for input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO16 | GPIO16 | Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules. | Flash |
| IO17 | GPIO17 | Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules. | Flash |
Pinout notes The ESP32 Lite V1.0.0 pinout brings out 26 pins at a 2.54 mm pitch - 23 usable GPIO alongside the 5V , GND and 3V3 power rails. On the analog side there are 15…
The ESP32 Lite V1.0.0 pinout brings out 26 pins at a 2.54 mm pitch - 23 usable GPIO alongside the 5V, GND and 3V3 power rails.
On the analog side there are 15 ADC-capable pins for sensors and battery monitoring.
If you want zero surprises, IO18, IO19, IO22, IO23 and 5 more are free of any such role - the safest first picks. 12 of the exposed pins carry boot-time or system duties on the ESP32 (IO0, IO2, IO4 and 9 more).
The ESP32 Lite V1.0.0 pinout mirrors the LOLIN32 Lite, with 26 ESP32 GPIOs on two rows for shield compatibility.
Power rails: USB 5V or VIN as input, regulated 3V3 for peripherals, and GND for returns.
Serial: U0_TX (GPIO1) and U0_RX (GPIO3) for programming. Additional UART on GPIO17/16.
I²C: Default SDA (GPIO21) and SCL (GPIO22).
SPI: VSPI on GPIO23/19/18/5, HSPI on GPIO12-15.
Analog & touch: ADC1 on GPIO32-39, ADC2 shared, DAC on GPIO25/26, capacitive touch available.
All GPIOs support PWM. Boot-strap pins GPIO0/2/15 must be HIGH on reset.
Getting started
flash your first firmware in ~2 minutesBoard: Lolin32 Lite
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(18, OUTPUT);
digitalWrite(18, LOW); // on (often inverted)[env:esp32-lite-v1]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32dev
variant: lolin32-lite
framework:
type: esp-idf
# blink - GPIO18
output:
- platform: gpio
pin: 18
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binSpecifications
ESP32 · 49.2 × 25.5 mmAbout this board
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $9.00 - less than the ~$20 most ESP32 boards go for.
Onboard you'll find battery charging (TP4054) via JST-PH 2.0 and Reset buttons.
- Available in Micro-USB and USB-C variants
Where to buy
prices are typical street prices
Resources
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