No wifi of lopy

[assia]

i can't get the wifi of my lopy to connect it to my computer and use FTP to download the boot.py and main.py. It worked well before. how can i fix it ?

[bucknall]

Hi @assia

Can you see the SSID of the wifi access point or is it not appearing at all?

Thanks,

Alex

[assia]

Hi @bucknall thanks for your response
it is not appearing at all

[bucknall]

@assia Hmm, can you open a serial connection with the board, i.e. connect to the board using USB and see what it prints out to the screen?

Thanks,

Alex

[assia]

@bucknall
I have already tried it, and it did not work with serial connection using:
$ screen /dev/tty.usbmodem* 115200
i get: no such file or directory

[bucknall]

@assia I'm assuming that you are on Linux? Also have you managed to open a serial connection before and now it has stopped working?

[livius]

@assia
in current situation try:
https://docs.pycom.io/pycom_esp32/pycom_esp32/toolsandfeatures.html#boot-modes-and-safe-boot

I suppose you have script which change mode to STA
Better is changing it to WLAN.STA_AP in developement
and also have some developement check like Pin()==1 to enter in some mode, like

if Pin()==1:
   execfile('wifi_ap.py')
else:
  execfile('wifi_sta.py')

[assia]

@bucknall
yes i am on Linux and i never managed to open a serial connection befor, so i used FTP.

[bucknall]

@assia Ok - lets try to get a serial connection working to diagnose the WiFi problem.

I'm on a Mac right now but it should be fairly similar -

What do you see if you enter the command:

$ ls /dev/ttyUSB*

Also have you used Serial to USB devices before? If not you may need to install the correct FTDI drivers for them to work - have a look here https://docs.pycom.io/pycom_esp32/pycom_esp32/getstarted.html?highlight=driver#connecting-a-board-using-pymakr-plugin

There's a note about the FTDI drivers which links you to this page http://www.ftdichip.com/Drivers/D2XX.htm

Let me know if that helps!

[assia]

Thanks @livius It worked well with this solution

in current situation try:
https://docs.pycom.io/pycom_esp32/pycom_esp32/toolsandfeatures.html#boot-modes-and-safe-boot

[assia]

Hi @bucknall thanks for your help, but I could not do it because I do not have a serial USB cable.

[assia]

Hi @bucknall to establish a serial connection we need an adapter USB/TTL or juste micro USB cable ?

[livius]

@assia said in No wifi of lopy:

adapter USB/TTL

Yes, you need converter