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Connaxio's Espoir
Industrial ESP32-MINI-1 board with PoE+ powered Ethernet and a mikroBUS socket for Click-board expansion.
61 × 50.8 mm
ESP32
MCU
240MHz
clock
4MB
flash
520KB
SRAM
16· 11 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
21 pins · 2.54 mm pitch| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 36 | ANA0 | strapping | adc | mikroBUS AN pin (analog input); input-only, ADC1 |
| 2 | 5 | RST | strapping | - | mikroBUS RST pin (reset out to Click board); ESP32 strapping pin |
| 3 | 15 | CSSSA13 | strapping | adc · touch · spi | mikroBUS CS (SPI chip-select); ADC2, touch T3; strapping pin |
| 4 | 14 | SCKA16 | strapping | adc · touch · spi | mikroBUS SCK (SPI clock); ADC2, touch T6 |
| 5 | 12 | MISOSDIA15 | strapping | adc · touch · spi | mikroBUS MISO (SPI); ADC2, touch T5; strapping pin |
| 6 | 13 | MOSISDOA14 | strapping | adc · touch · spi | mikroBUS MOSI (SPI); ADC2, touch T4 |
| 7 | 2 | PWMA12 | strapping | adc · touch · pwm | mikroBUS PWM pin; ADC2, touch T2; strapping pin |
| 8 | 4 | INTA10 | strapping | adc · touch | mikroBUS INT pin (interrupt); ADC2, touch T0 |
| 9 | 9 | RXRX1 | strapping | uart | mikroBUS RX (UART1 RX); free in DIO flash mode |
| 10 | 10 | TXTX1 | strapping | uart | mikroBUS TX (UART1 TX); free in DIO flash mode |
| 11 | 18 | SCL | safe | i2c | mikroBUS SCL (I2C clock) |
| 12 | 23 | SDA | safe | i2c | mikroBUS SDA (I2C data) |
| 13 | - | 3V3 | power | - | mikroBUS 3.3V supply |
| 14 | - | 5V | power | - | mikroBUS 5V supply |
| 15 | - | GND | ground | - | mikroBUS ground (two GND pins on the socket) |
| 16 | 34 | A6 | strapping | adc | Extension header, input-only pin; ADC1 |
| 17 | 37 | A1 | strapping | adc | Extension header, input-only pin; ADC1 |
| 18 | 38 | A2 | strapping | adc | Extension header, input-only pin; ADC1 |
| 19 | 39 | A3 | strapping | adc | Extension header, input-only pin; ADC1 |
| 20 | - | EN | control | - | Extension header, ESP32 reset (CHIP_PU, active-low) |
| 21 | - | GND | ground | - | Extension header ground (two GND pins) |
Start with these
2 pins with no boot or system involvementSCLSDA
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 |
|---|---|---|---|
| AN | GPIO36 (SENSOR_VP) | Cannot be used as output; only suitable for input (e.g., analog read). | Other |
| RST | GPIO5 | Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot. | Strapping |
| CS | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| SCK | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
| MISO | 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 |
| MOSI | MTCK (GPIO13) | Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed. | Other |
| PWM | GPIO2 | If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure. | Strapping |
| INT | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
| A6 | GPIO34 | Cannot be used as output (no drive capability); only suitable for analog/digital input. | Other |
| A1 | GPIO37 (SENSOR_CAPP) | Cannot be used as output; only suitable for input. | Other |
| A2 | GPIO38 (SENSOR_CAPN) | Cannot be used as output; only suitable for input. | Other |
| A3 | 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 |
|---|---|---|---|
| RX | GPIO9 (Flash SD2) | Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO. | Flash |
| TX | GPIO10 (Flash SD3) | Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO. | Flash |
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 Connaxio's Espoir breaks out 21 pins in total: 16 GPIO for your project, with 3V3 , 5V and GND handling power. For peripherals, I²C is mapped to SDA on…
The Connaxio's Espoir breaks out 21 pins in total: 16 GPIO for your project, with 3V3, 5V and GND handling power.
For peripherals, I²C is mapped to SDA on GPIO23 and SCL on GPIO18; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO10 and GPIO9 cover serial logging and flashing.
On the analog side there are 11 ADC-capable pins for sensors and battery monitoring, PWM on 1 pins and 6 capacitive-touch inputs.
If you want zero surprises, SCL and SDA are free of any such role - the safest first picks. 12 of the exposed pins carry boot-time or system duties on the ESP32 (AN, RST, CS and 9 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: CP2102N. Not detected? Hold BOOT while plugging in.
2
Flash with your tool
Arduino IDE, PlatformIO, ESPHome or esptool - copy the settings on the right.
3
Verify it runs
The blink example uses GPIO18 - swap for your board's LED pin if different.
Board: Connaxio Espoir
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(18, OUTPUT);
digitalWrite(18, LOW); // on (often inverted)[env:connaxio_espoir]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32dev
variant: connaxio_espoir
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.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32 · 61 × 50.8 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
16 · 11
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
USB-C
Serial
CP2102N
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
61 × 50.8 mm · pin pitch 2.54 mm
The Connaxio's Espoir 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 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $50.00 - above the ~$20 typical for ESP32 boards.
Only 16 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Onboard you'll find Power over Ethernet (PoE) and wired Ethernet (KSZ8081).
- mikroBUS socket for Click board expansion
- PoE+ (802.3af/at), jumper-selectable Class 2/3/4
- OSHWA-certified open-source hardware
Where to buy
prices are typical street pricesConnaxio's Espoir
$50.00per unit, typical
Resources
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