ET-M04
RP2040 Dev Board
Dual-core 133 MHz, 2 MB flash, PIO, USB-C and Qwiic
AED 29.00
Out of stockOverview
Dual-core 133 MHz, 2 MB flash, PIO, USB-C and Qwiic
The ET-M04 is built around the Raspberry Pi RP2040 — dual Cortex-M0+ 133MHz, 264KB SRAM, 8 PIO state machines.
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- PIO tricks: WS2812, VGA, extra UARTs
- MicroPython and CircuitPython
- USB HID gadgets
Key features
What makes it different
MCU
Raspberry Pi RP2040: dual Cortex-M0+ 133MHz, 264KB SRAM, 8 PIO state machines
Flash
2MB QSPI (W25Q16), drag-and-drop UF2 bootloader
USB
USB-C, USB 1.1 device/host
I/O
19 GPIO on the header (3 ADC), SWD pads, Qwiic on GPIO4/5
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Specifications
Technical specifications
| MCU | Raspberry Pi RP2040: dual Cortex-M0+ 133MHz, 264KB SRAM, 8 PIO state machines |
|---|---|
| Flash | 2MB QSPI (W25Q16), drag-and-drop UF2 bootloader |
| USB | USB-C, USB 1.1 device/host |
| I/O | 19 GPIO on the header (3 ADC), SWD pads, Qwiic on GPIO4/5 |
| Size | 50.8 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 23-pin 2.54 mm header · USB-C 16P receptacle (USB 2.0) — USB-C (power + native USB / bridge) |
| Main IC | RP2040 (LCSC C2040) |
| Revision | Rev A |
| Libraries | Arduino-Pico (Earle Philhower), Pico SDK C/C++, MicroPython, CircuitPython |
|---|
Performance
Memory
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VBUS | Power | 5V from USB-C |
| 2 | 3V3 | Power | 600mA LDO |
| 3 | GND | Ground | Ground |
| 4 | RUN | Control | Reset, active low |
| 5 | GPIO0 | GPIO | UART0 TX |
| 6 | GPIO1 | GPIO | UART0 RX |
| 7 | GPIO2 | GPIO | SPI0 SCK |
| 8 | GPIO3 | GPIO | SPI0 TX |
| 9 | SDA | I²C | GPIO4 — I2C0 SDA (Qwiic) |
| 10 | SCL | I²C | GPIO5 — I2C0 SCL (Qwiic) |
| 11 | GPIO6 | GPIO | PWM |
| 12 | GPIO7 | GPIO | PWM |
| 13 | GPIO8 | GPIO | GPIO8 |
| 14 | GPIO9 | GPIO | GPIO9 |
| 15 | GPIO10 | GPIO | GPIO10 |
| 16 | GPIO11 | GPIO | GPIO11 |
| 17 | GPIO12 | GPIO | GPIO12 |
| 18 | GPIO13 | GPIO | GPIO13 |
| 19 | GPIO14 | GPIO | GPIO14 |
| 20 | GPIO15 | GPIO | GPIO15 |
| 21 | GPIO26 | GPIO | ADC0 |
| 22 | GPIO27 | GPIO | ADC1 |
| 23 | GPIO28 | GPIO | ADC2 |
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors).
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-M04 RP2040 Dev Board (assembled)
- 1 × 23-pin 2.54 mm male header, unsoldered
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
- Libraries: Arduino-Pico (Earle Philhower), Pico SDK C/C++, MicroPython, CircuitPython
Compare
Which small MCU for a Qwiic helper?
| RP2040 Dev Board (this board)This board | ET-M05 CH32V003 RISC-V Qwiic MCU | ET-M06 STM32G030 Qwiic MCU | ET-M07 ATtiny1616 Qwiic MCU | |
|---|---|---|---|---|
| What it does | Dual-core 133 MHz, 2 MB flash, PIO, USB-C and Qwiic | Tiny 48 MHz RISC-V MCU that runs from 3.3 or 5 V Qwiic | Cortex-M0+ 64 MHz with SWD and level-shifted Qwiic | 20 MHz tinyAVR with UPDI, 3.3–5 V, Qwiic |
| Interface | — | — | — | — |
| Best for | PIO tricks: WS2812, VGA, extra UARTs | Custom I²C peripherals | Learning STM32 HAL and Rust embassy | Arduino-programmable I²C helpers |
| Price | 29 AED | 9 AED | 39 AED | 15 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.