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WiPy 3.0
Pycom’s ESP32 board with MicroPython support - great for scripting low-power IoT devices.
42 × 20 mm
ESP32
MCU
240MHz
clock
8MB
flash
520KB
SRAM
14· 11 ADC
GPIO
BLE 4.2+ WiFi
radio
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 | strapping | 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
6 pins with no boot or system involvementP16GPIO27P38GPIO18P22GPIO25P21GPIO26P20GPIO33P19GPIO32
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 |
|---|---|---|---|
| P23 | GPIO0 | Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode. | Strapping |
| P24 | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
| P21 | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| P34 | GPIO5 | Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot. | Strapping |
| P23 | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
| P12 | GPIO34 | Cannot be used as output (no drive capability); only suitable for analog/digital input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| P9 | U0RXD (GPIO3) | Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads. | USB |
| P10 | U0TXD (GPIO1) | Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console. | 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 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…
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, P16, P38, P22, P21 and 2 more are free of any such role - the safest first picks. 6 of the exposed pins carry boot-time or system duties on the ESP32 (P23, P24, P21 and 3 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) if no port appears. 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 GPIO27 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: "ESP32 Wrover Module"▸
Flash Size: "8MB (64Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "QSPI PSRAM"▸
Partition Scheme: "8M with spiffs (3MB APP / 1.5MB SPIFFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: 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
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Wrover Module
// blink the onboard LED
void setup() {
pinMode(27, OUTPUT);
}
void loop() {
digitalWrite(27, HIGH); delay(500);
digitalWrite(27, LOW); delay(500);
}board to selectesp32dev⧉ copy
[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_PSRAMFind it: PlatformIO Home ▸ Boards, search
esp32dev — or type it after board =.board to selectesp32dev⧉ copy
esp32:
board: esp32dev
variant: wipy3
framework:
type: esp-idf
psram:
mode: quad
speed: 80MHz
# blink - GPIO27
output:
- platform: gpio
pin: 27
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32dev (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 esp32 --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 294912 B · DIO
Specifications
ESP32 · 42 × 20 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 8MB · 4MB (QSPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
14 · 11
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
None
Serial
-
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 288 KB
42 × 20 mm · pin pitch 2.54 mm
The WiPy 3.0 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 288 KB available for data.
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 pricesWiPy 3.0
$32.50per unit, typical
Resources
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