WiPy 3.0
Pycom’s ESP32 board with MicroPython support - great for scripting low-power IoT devices.
WiPy 3.0 Pinout
18 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | RST | control | - | Reset (ChipPU) |
| 2 | 3 | P9GPIO3 | uart | uart · pwm | |
| 3 | 1 | P10GPIO1 | uart | uart · pwm | |
| 4 | 0 | P23GPIO0 | strapping | pwm | |
| 5 | 4 | P24GPIO4 | safe | adc · touch · pwm | |
| 6 | 15 | P21GPIO15 | strapping | adc · touch · pwm | |
| 7 | 5 | P34GPIO5 | strapping | adc · pwm | |
| 8 | 27 | P16GPIO27 | safe | adc · touch · pwm | |
| 9 | 18 | P38GPIO18 | safe | adc · pwm | |
| 10 | - | Vin | power | - | 3.5-5.5V input |
| 11 | - | GND | ground | - | |
| 12 | - | 3V3 | power | - | 3.3V output |
| 13 | 14 | P23GPIO14 | strapping | adc · touch · spi · pwm | |
| 14 | 25 | P22GPIO25 | safe | adc · dac · pwm | |
| 15 | 26 | P21GPIO26 | safe | adc · dac · pwm | |
| 16 | 33 | P20GPIO33 | safe | adc · touch · pwm | |
| 17 | 32 | P19GPIO32 | safe | adc · touch · pwm | |
| 18 | 34 | P12GPIO34 | strapping | adc | Input only |
Start with these
7 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
7 pins · 7 things to knowP9GPIO3 Default UART0 RX pin for USB-serial programming (console input). UART
Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads.
P10GPIO1 Default UART0 TX pin for USB-serial programming and console. UART
Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console.
P23GPIO0 Bootstrapping pin (enter bootloader when low); internal pull-up. Strapping
Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode.
P21GPIO15 Bootstrapping pin; JTAG TDO; controls UART0 boot log output; also HSPICS0 (secondary SPI CS). Strapping
Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change.
P34GPIO5 Bootstrapping pin; internal pull-up; VSPI CS0 (default SPI chip-select); acts as FSPIWP (flash write-protect) on internal-flash variants. Strapping
Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot.
P23GPIO14 JTAG mode select pin (TMS); also HSPI CLK and PWM-capable GPIO. JTAG
Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot.
P12GPIO34 Input-only GPIO (no output driver); ADC1 channel 6. Other
Cannot be used as output (no drive capability); only suitable for analog/digital input.
Across 18 pins (2.54 mm pitch), the WiPy 3.0 exposes 14 GPIO plus Vin, GND and 3V3 for power.
On the analog side there are 11 ADC-capable pins for sensors and battery monitoring, PWM on 13 pins, 6 capacitive-touch inputs and 2 true DAC outputs.
If you want zero surprises, P24, P16, P38, P22 and 3 more are free of any such role - the safest first picks. 7 of the exposed pins carry boot-time or system duties on the ESP32 (P9, P10, P23 and 4 more).
Getting started
flash your first firmware in ~2 minutesBoard: ESP32 Wrover Module Flash Size: 8MB (64Mb) Flash Mode: DIO PSRAM: QSPI PSRAM Partition Scheme: 8M with spiffs (3MB APP/1.5MB SPIFFS) Upload Speed: 921600
// toggle GPIO4 - wire an LED and resistor to it
void setup() {
pinMode(4, OUTPUT);
}
void loop() {
digitalWrite(4, HIGH); delay(500);
digitalWrite(4, LOW); delay(500);
}[env:wipy3]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_qspi
build_flags = -DBOARD_HAS_PSRAMesp32dev - or type it after board =.esp32:
board: esp32dev
variant: esp32
framework:
type: esp-idf
psram:
mode: quad
speed: 80MHz
# blink - GPIO4
output:
- platform: gpio
pin: 4
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32dev (same ids as PlatformIO).esptool.py --chip esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x1000 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32 · 42 × 20 mm · vs other ESP32 chips →Dimensions
About this board
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $32.50 - above the ~$20 typical for ESP32 boards.
Only 14 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Onboard you'll find 4MB (QSPI) PSRAM and an addressable RGB LED.
- Switchable onboard PCB antenna / external u.FL antenna (selected via P12 / GPIO21)
- 3V3 output pin can source up to 550mA
- No onboard USB - needs the Pycom Expansion Board for USB and serial
Where to buy
prices are typical street pricesResources
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