Bluetooth V4.0 HM-11 BLE Module
HM-11 Bluetooth 4.0 BLE module with UART serial interface operating in the 2.4 GHz ISM band. Used to add low-energy wireless connectivity to microcontroller projects via AT commands.
HM-11 Bluetooth 4.0 BLE module with UART serial interface operating in the 2.4 GHz ISM band. Used to add low-energy wireless connectivity to microcontroller projects via AT commands.
UART RTS
UART transmit
UART CTS
UART receive
No connection
No connection
Reserved/not user pin per Seeed table
Reserved/not user pin per Seeed table
Power supply
No connection
Reset, active low at least 5ms
Ground
IO port, used for DHT11/DS18B20 in Seeed docs
Digital input/output
LED indicator IO
Button pin
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| UART_RTS | pin 1 | uart | UART RTS | 3.3V LVTTL |
| UART_TX | pin 2 | uart output | UART transmit | 3.3V LVTTL |
| UART_CTS | pin 3 | uart | UART CTS | 3.3V LVTTL |
| UART_RX | pin 4 | uart input | UART receive | 3.3V LVTTL |
| NC | pin 5 | no connect | No connection | |
| NC | pin 6 | no connect | No connection | |
| NV | pin 7 | reserved | Reserved/not user pin per Seeed table | |
| NV | pin 8 | reserved | Reserved/not user pin per Seeed table | |
| VCC | pin 9 | power input | Power supply | 3.3V |
| NC | pin 10 | no connect | No connection | |
| RESETB | pin 11 | input | Reset, active low at least 5ms | 3.3V logic |
| GND | pin 12 | power | Ground | 0V |
| PIO3 | pin 13 | gpio | IO port, used for DHT11/DS18B20 in Seeed docs | 3.3V logic |
| PIO2 | pin 14 | gpio | Digital input/output | 3.3V logic |
| PIO1 | pin 15 | gpio | LED indicator IO | 3.3V logic |
| PIO0 | pin 16 | gpio | Button pin | 3.3V logic |
UART · SPI · 3.3 V · 5 V · Breakout
Seeed describes MDBT50Q-1M and MDBT50Q-P1M as Bluetooth 5.0 / BLE modules based on Nordic nRF52840, with GPIO, SPI, UART, I2C, I2S, PWM, …
Module pins: VCC, GND, UART_RTS, UART_CTS, PIO3, PIO2, PIO1, PIO0. Schematik maps them to your board in the app.
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