Bw16 (wifi) to Ethernet Bridge @ 5GHz

Technical Discussion BW16
1

Hi all,

Having tried to create a 5ghz to ethernet bridge unsuccessfully, using the BW16, I have decided to change tack. My initial attempt was using wiz5500 ethernet module. However the attempt failed because the Arduino sketch required the Ethernet.h library. This fails to compile under the current RTL sdk in Arduino.

Now I have decided to use the CH9121 module instead of the wiz5500. It is also very cost effective just like the 5500 module, costing around usd2 on aliexpress.

The 9121 uses a serial to ethernet implementation having built in TCP, UDP ARP etc. It can be used both in server and client modes. The serial data can be exchanged with the bw16 using the BW16’s serial port. Hopefully no special library would be needed to implement this arrangement.

The first step is to write a captive portal on a bw16 serving a simple one html page in AP mode. The will be my ‘signal generator’ for testing the actual bridge circuit, using a bw16 connected to a CH9121.

I shall be sharing progress on this thread. So please stay tuned if you are interested.

Azhaque

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2

Hi,

First milestone achieved, by making both serial ports operational. I used the software serial example code given in the examples section of 3.1.7 arduino sdk.

Now to physically connect up the 9121 module. This should require 4 connections- +3.3v, Gnd, TX and Rx, to the bw16.

Because of rain I plan to do it tomorrow. The bw16 is already mounted on a breadboard.

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Just need to add the 9121 module and solder connections.

Azhaque

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