INEX OpenKB Development Board
Code name: openkb
INEX OpenKB development board is based on esp32 microcontroller and uses xtensa architecture. This board has a maximum CPU frequency of 240 MHz and a flash size of 4MB.
About INEX OpenKB
ESP32-powered open keyboard platform - great for custom keyboards, input devices, and maker builds.
Technical Specifications
🛰️ Connectivity
🧠 Microcontroller
✨ Features
- 38 digital IO pins
- 16 external interrupt pins
- 16 analog input pins
- 21 PWM pins
INEX OpenKB Pins Mapping Arduino IDE
Below you can find the INEX OpenKB pinout. This development board provides 38 digital IO pins, out of which 16 can be used as external interrupt pins, 16 as analog input pins and 21 pins have Pulse-Width Modulation (PWM).
| Pin | Analog | Touch | PWM | Other |
|---|---|---|---|---|
| 0 | A11 | T1 | ||
| 1 | PWM | TX WIRE1_PIN_DEFINED | ||
| 2 | A12 | T2 | PWM | WIFI_LED |
| 3 | PWM | RX | ||
| 4 | A10 | T0 | PWM | SDA1 |
| 5 | PWM | SS SCL1 | ||
| 12 | A15 | T5 | PWM | IOT_LED |
| 13 | A14 | T4 | PWM | BUZZER |
| 14 | A16 | T6 | PWM | SW2 |
| 15 | A13 | T3 | PWM | NTP_LED |
| 16 | PWM | LED_BUILTIN SW1 | ||
| 17 | PWM | BT_LED | ||
| 18 | PWM | SCK KB_GPIO18 | ||
| 19 | PWM | MISO KB_GPIO19 | ||
| 21 | PWM | SDA SDA0 | ||
| 22 | PWM | SCL SCL0 | ||
| 23 | PWM | MOSI | ||
| 25 | A18 | PWM | DAC1 | |
| 26 | A19 | PWM | DAC2 OUTPUT1 | |
| 27 | A17 | T7 | PWM | OUTPUT2 |
| 32 | A4 | T9 | PWM | INPUT1 |
| 33 | A5 | T8 | PWM | INPUT2 |
| 34 | A6 | INPUT3 | ||
| 35 | A7 | INPUT4 | ||
| 36 | A0 | LDR_PIN | ||
| 39 | A3 | |||
| KB_GPIO23= |
Default Tools
| Bootloader tool | esptool_py |
| Uploader tool | esptool_py |
| Network uploader tool | esp_ota |
| Bootloader address | 0x1000 |
| Flash mode | dio |
| Boot mode | dio |
| Maximum upload size | 1280 Kb (1310720 B) |
| Maximum data size | 320 Kb (327680 B) |
The INEX OpenKB development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x1000". Flash mode and boot mode for INEX OpenKB development board by default is dio and dio respectively.
