Hardware wiring
=============

This document mainly introduces the hardware needed for downloading and program firmware, sending AT commands and receiving AT responses, and how to connect the hardware.

For different series of modules, the commands supported by AT default firmware will be different. Refer to for details  :doc:`other/firmware_differences`
      


Ai-WB2 series
------------------

.. list-table::
    :header-rows: 1

    * - USB to TTL
      - Ai-WB2 series
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - RXD
     
    * - RXD
      - TXD
      


BW16 module（ Realtek RTL8720DN solution ）
--------------------------------------

.. list-table::
    :header-rows: 1

    * - USB to TTL
      - BW16
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - RXD
     
    * - RXD
      - TXD
      

TB Telink bluetooth series
------------------

TB-01 wiring 


.. list-table::
    :header-rows: 1


    * - USB to TTL
      - TB-01
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - PB1
     
    * - RXD
      - PB0
      
TB-02 wiring

.. list-table::
    :header-rows: 1


    * - USB to TTL
      - TB-02
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - RX0
     
    * - RXD
      - TX0


TB-03F wiring

.. list-table::
    :header-rows: 1


    * - USB to TTL
      - TB-03F
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - PA0
     
    * - RXD
      - PB1


TB-04 wiring 

.. list-table::
    :header-rows: 1


    * - USB to TTL
      - TB-04
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - RXD
     
    * - RXD
      - TXD



PB PHYplus bluetooth series
------------------

PB-01/PB-02 wiring

.. list-table::
    :header-rows: 1


    * - USB to TTL
      - PB-01/PB-02
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - RXD
     
    * - RXD
      - TXD


PB-03/PB-03F/PB-03M wiring

.. list-table::
    :header-rows: 1


    * - USB to TTL
      - PB-03/PB-03F/PB-03M
      
    * - VCC
      - 3.3V
          
    * - GND
      - GND
      
    * - TXD
      - P10
     
    * - RXD
      - P9