E22-400TBH-02 LoRa module development test board
[Interface]：USB
[Size]：59.5*97mm
[Introduction]：E22-400TBH-02 is an entry-level development board that uses the E22-400T37S series LoRa module named for its high-power long-distance communication. This development board has a variety of transmission methods, works in the 230/433/470MHz frequency band, LoRa spread spectrum technology, TTL level output, and supports a power supply voltage of 4.5V~15V. Most of the pins of the module on the board have been led to pin headers on both sides. Developers can easily connect various peripheral devices through jumpers according to actual needs. The development board can also be plugged into a breadboard for use.
| Pin number | Pin name | Type | Pin usage |
| 1 | GND | input | Module ground wire |
| 2 | GND | input | Module ground wire |
| 3 | RESET | input | Module reset pin |
| 4 | AUX | output | Used to indicate the working status of the module; the user wakes up the external MCU and outputs low level during power-on self-test initialization; (can be left floating) |
| 5 | TXD | output | TTL serial port output, connected to the external RXD input pin; |
| 6 | RXD | input | TTL serial port input, connected to the external TXD output pin; |
| 7 | M1 | input | Cooperate with M0 to determine the 4 working modes of the module (cannot be left floating, can be grounded if not used) |
| 8 | GND | input | Module ground wire |
| 9 | GND | input | Module ground wire |
| 10 | M0 | input | Cooperate with M1 to determine the 4 working modes of the module (cannot be left floating, can be grounded if not used) |
| 11 | 3.3V | - | No need to care, leave it hanging |
| 12 | GND | input | Module ground wire |
| 13 | SWCLK | - | No need to care, leave it hanging |
| 14 | SWDIO | - | No need to care, leave it hanging |
| 15 | NC | - | No need to care, leave it hanging |
| 16 | NC | - | No need to care, leave it hanging |
| 17 | NC | - | No need to care, leave it hanging |
| 18 | 485-EN | input /Output | The enable control pin of the external 485 chip can be left unconnected if it is not used. |
| 19 | STATE | output | Module status indication output, if no floating processing is used |
| 20 | GND | input | Module ground wire |