Main hub
A main hub or a central board is the heart of BeeHive. This module is built around an ESP32 microcontroller and a number of connectors. The board works from a 12V5A power supply that is connected via a barrel jack. The 12V5A line is then traced to a USB connector and to 5V3A on-board power supply.
The main hub has in total 16 connectors. These connectors are:
- 8 digital general-purpose connectors
- 3 analog connectors
- 2 I2C connectors
- 1 UART connector
- 2 12V5A connectors
A pin mapping table shown below may prove to be helpful when working on programming IO ports. Table 1 - Pin mapping
| Connector pin | ESP32 port |
|---|---|
| D1-3 | IO15 |
| D1-4 | IO2 |
| D2-3 | IO0 |
| D2-4 | IO4 |
| D3-3 | IO16 |
| D3-4 | IO17 |
| D4-3 | IO5 |
| D4-4 | IO18 |
| D5-3 | IO19 |
| D5-4 | IO21 |
| D6-3 | IO22 |
| D6-4 | IO23 |
| D7-3 | IO14 |
| D7-4 | IO27 |
| D8-3 | IO26 |
| D8-4 | IO25 |
| A1-3 | IO35 |
| A1-4 | IO34 |
| A2-3 | IO39 |
| A2-4 | IO36 |
| A3-3 | IO32 |
| A3-4 | IO33 |
| I2C_1-3 | IO9 |
| I2C_1-4 | IO10 |
| I2C_2-3 | IO12 |
| I2C_2-4 | IO13 |
| UART-3 (TX) | IO1 |
| UART-4 (RX) | IO3 |
Do not connect or disconnect connectors while power is ON. All adjustments must be done ONLY when power is OFF.
Be gentle when working with mechanical connectors such as USB, barrel jack and JST connectors. It is strongly advised to hold them down when connecting or disconnecting cables as otherwise mechanical malfunction may occur and/or the connector may break.
