Rpi USB wifi

[Glen Beestone]

Can anyone recommend a USB wifi adapter that definitely work with an original Version 1 Rasbperry Pi model B

I’ve tried loads and either the device is not seen or it is seen but scanning for SSIDs produces nothing

 

These same USB wifi devices work fine in my RPi models 0, 2 and 3

 

( and it’s not the Rpi at fault as I have tried the same on another RPi-B)

 

There is an “official” raspberry pi dongle at https://shop.pimoroni.com/products/official-raspberry-pi-wifi-dongle# but I really need one with an external RP-SMA connector

 

 

Glen

[David Pye]

Ooh, that's interesting.

I wonder if it's power supply related?  IIRC Pi 1 is limited in its' current sourcing ability?

David

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[Alistair MacDonald]

That sounds odd, but I guess you knew that hence you posting it. the
following will help not at all...

I have been lucky in the past and both low cost Chinese imports I have
bought in the past work well on the original B. Sadly neither support
an external antenna. I have had power issues on long power cables but
that results in the Pi not booting or crashing when I "wget" a large
file. It is worth noting that this happens with an external HDD and
hardwired networking so is just power usage and not USB wifi specific.

I am presuming you checked, but is it the same distro on all the models?

Alistair

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[Alistair MacDonald]

Ps. I have overcome some power supply issues by feeding 5V in on the
GPIO 5V pin, but obviously that needs to be regulated.

On 14 May 2018 at 18:03, Alistair MacDonald

[Glen Beestone]

Yes I've actually used the same SDcard (Max2Play) on both devices (with an adapter)


Also used a high power supply so I don't think it's that.

Maybe I've just been unlucky with the devices I've bought. But it's odd that they work in the newer Pi models

G

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[Alistair MacDonald]

I would not rule out the power issue just yet. The model B supply was
an issue for several reasons. The reason I had issue was because of
the resistance of the mini SMD. Have a look at
https://www.rs-online.com/designspark/raspberry-pi-schematics-revision-2-1
and search for "700ma" you will find the power circuit. This was only
one of the many issues that were addressed in the B+ and later models.

Feeding power directly in to the 5V rail bypasses this. Another thing
to check is to put a scope on TP1 and set it to capture on a falling
voltage just below 5V. When it updates you have a power issue.

Alistair