How to make the DIY WiFi Shield

You can make your own WiFi shield!
Just prepare some type of element like resistor and capacitor.

AND ODROID Board AND SDIO interface supported WiFI CHIP. :)

This Testing WiFI Shield is made by the tobetter. :)

Before using the esp8089 kernel driver, you have to install the esp8089 module to the ODROID-C4 Board. - How to Install modules
And you have to copy a esp8089.dtbo file to the /media/boot/amlogic/overlays/odroidc4/.

Edit the config.ini file to apply dtbo files when booting.

target

$ vi /media/boot/config.ini

target

...
; Device Tree Overlay
overlay_resize=16384
overlay_profile=
overlays="spi i2c1 uart0 esp8089"
 
[overlay_custom]
...

After editing the config.ini file, please reboot the ODROID board.

you can insert the esp8089 module.

target

$ modprobe esp8089 [eagle_path=(path) esp_enable_gpio=(enable_gpio_num, default 493) esp_reset_gpio=(reset gpio num, default 494)]

Turn on the wifi and Connect to the AP.

target

$ nmcli radio wifi on

target

$ nmcli dev wifi list
IN-USE  BSSID              SSID                         MODE   CHAN  RATE        SIGNAL  BARS  SECURITY
        DE:AD:BE:EF:BE:EF  SSID_1                       Infra  2     270 Mbit/s  100     ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_2                       Infra  11    195 Mbit/s  100     ▂▄▆█  WPA1 WPA2
*       DE:AD:BE:EF:BE:EF  SSID_3                       Infra  13    270 Mbit/s  100     ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_4                       Infra  1     270 Mbit/s  94      ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_5                       Infra  4     270 Mbit/s  90      ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_6                       Infra  6     270 Mbit/s  90      ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_7                       Infra  7     270 Mbit/s  90      ▂▄▆█  WPA2
        DE:AD:BE:EF:BE:EF  SSID_8                       Infra  8     270 Mbit/s  74      ▂▄▆_  WPA2

target

$ nmcli dev wifi con 'TARGET_AP_ID' password 'P/W of TARGET_AP'

Check the connection information.

target

$ ifconfig wlan0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.30.84  netmask 255.255.255.0  broadcast 192.168.30.255
        inet6 dead::beef:dead:beef:1234  prefixlen 64  scopeid 0x20<link>
        inet6 dead::beef:dead:beef:1234  prefixlen 64  scopeid 0x20<link>
        inet6 dead::beef:dead:beef:1234  prefixlen 64  scopeid 0x20<link>
        ether DE:AD:BE:EF:BE:EF  txqueuelen 1000  (Ethernet)
        RX packets 53  bytes 13882 (13.8 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 17  bytes 2354 (2.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
or
$ ip addr
...
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether DE:AD:BE:EF:BE:EF brd ff:ff:ff:ff:ff:ff
    inet 192.168.30.84/24 brd 192.168.30.255 scope global dynamic noprefixroute wlan0
       valid_lft 7012sec preferred_lft 7012sec
    inet6 dead::beef:dead:beef:1234/64 scope link dadfailed tentative noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 dead::beef:dead:beef:1234/64 scope link dadfailed tentative noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 dead::beef:dead:beef:1234/64 scope link dadfailed tentative noprefixroute 
       valid_lft forever preferred_lft forever