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by abelectronicsuk
Sat Mar 04, 2017 10:03 pm
Forum: General discussion
Topic: External Antenna connector for the Pi Zero W
Replies: 29
Views: 15780

Re: External Antenna connector for the Pi Zero W

klricks, There is no need to scrape any trace away. Scrape what trace? You are not as lazy as me. I would leave the zero ohm resistor in place. Make a solder bridge from the resistor to the pad to the south. Then slice the track to the right with an exacto knife. Job done. If you leave the resistor...
by abelectronicsuk
Sat Mar 04, 2017 8:27 pm
Forum: General discussion
Topic: External Antenna connector for the Pi Zero W
Replies: 29
Views: 15780

Re: External Antenna connector for the Pi Zero W

It would have to be a very small SPDT switch. Like the size of that zero ohm resistor :) The resistor is a 0201 size so need a switch 0.6mm x 0.3mm :) At 2.4GHz a 1/4 wave antenna is only 31.25mm so adding a set of jumpers the size of a GPIO header would be getting close to the resonant frequency o...
by abelectronicsuk
Sat Mar 04, 2017 4:48 pm
Forum: General discussion
Topic: External Antenna connector for the Pi Zero W
Replies: 29
Views: 15780

Re: External Antenna connector for the Pi Zero W

Its really great, and I see that you used the tip I mentioned in the blog to turn the zero ohms reistor 90 degrees, unless of course you thought of that yourself. I didnt see your post about the resistor, it wasnt the easiest component to move, not sure what size it is but with the 0.5mm soldering ...
by abelectronicsuk
Sat Mar 04, 2017 4:00 pm
Forum: General discussion
Topic: External Antenna connector for the Pi Zero W
Replies: 29
Views: 15780

Re: External Antenna connector for the Pi Zero W

bensimmo wrote:What happens if you have them both connected up ?
The resistor link changes the port/antenna used so this mod disconnects the PCB antenna. if both are connected there would be a RF mismatch between the antennas which could damage the RF stages in the chip.
by abelectronicsuk
Sat Mar 04, 2017 2:05 pm
Forum: General discussion
Topic: External Antenna connector for the Pi Zero W
Replies: 29
Views: 15780

External Antenna connector for the Pi Zero W

I have modified the new Raspberry Pi Zero W to add a U.FL antenna connector to use an external WiFi aerial with the new Pi and added more photos and the parts required to my blog at http://www.briandorey.com/post/Raspberry-Pi-Zero-W-external-antenna-mod http://www.briandorey.com/docs/2017-03-04-rasp...
by abelectronicsuk
Tue Feb 28, 2017 6:58 pm
Forum: General discussion
Topic: Pi Zero W UART and bluetooth
Replies: 7
Views: 8006

Re: Pi Zero W UART and bluetooth

Can anyone at RPI confirm if the new Pi Zero W uses the same soft UART to the GPIO headers as the Pi 3 or is the original hardware UART still connected to the GPIO ? It's effectively the same as the Pi3 (note, both are HW UARTS on there too) with a minor but useful difference in the on the Zero, th...
by abelectronicsuk
Tue Feb 28, 2017 10:37 am
Forum: General discussion
Topic: Pi Zero W UART and bluetooth
Replies: 7
Views: 8006

Pi Zero W UART and bluetooth

Can anyone at RPI confirm if the new Pi Zero W uses the same soft UART to the GPIO headers as the Pi 3 or is the original hardware UART still connected to the GPIO ?
by abelectronicsuk
Sat Feb 18, 2017 10:57 pm
Forum: General discussion
Topic: Does anyone know any ADC / DAC all in one hats
Replies: 6
Views: 1542

Re: Does anyone know any ADC / DAC all in one hats

There is the ADC DAC pi board which has 2 12bit ADC inputs and 2 12bit DAC https://www.abelectronics.co.uk/p/74/AD ... sion-board
by abelectronicsuk
Mon Mar 07, 2016 2:15 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

You still haven't addressed point 2, and I think making the rpi-update + serial0 optional without any indication why is confusing, but it is your blog and I will say no more. I am sorry i haven't explained the fix correctly, i have removed the post and will wait until the foundation have the fix in...
by abelectronicsuk
Mon Mar 07, 2016 2:04 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

Another few corrections: 1) There's a stray space in sudo nano /boot/ cmdline.txt 2) If you want Bluetooth to work then don't disable the hciuart service - just edit hciuart.service as you describe. If you don't want Bluetooth then don't edit the service, just disable it. Pick one. 3) Although I am...
by abelectronicsuk
Mon Mar 07, 2016 1:35 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

I've pushed the overlay (pi3-miniuart-bt) to the source trees. It will appear in the next release, or you can download prebuilt one here . I have made a copy of the overlay and included the link in a blog post on (link removed) for all the steps I used to setup the serial console with the overlay. ...
by abelectronicsuk
Thu Mar 03, 2016 10:13 am
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

Try using console=serial1 in cmdline.txt. It will get mapped back to ttyAMA0. I'm working on a firmware update that will restore the original behaviour when the overlay is used, but for now this one weird trick is necessary. This seems to have fixed the login problems via uart but when i tried runn...
by abelectronicsuk
Wed Mar 02, 2016 9:20 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

After a couple of reinstalls i have got the UART port working at the speeds i want i.e 115200 using minicom to talk to the host machine but i cant seem to get the serial console to start on boot now :(
by abelectronicsuk
Wed Mar 02, 2016 10:50 am
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Re: Overlay to remap Pi 3 UART

I'll put together an overlay that disables Bluetooth and UART1 and maps UART0/ttyAMA0 to GPIOs 14 & 15. Thank you for doing this, I havent used the overlays before and need to learn how they work :) We have a lot of users who use serial based data loggers via the GPIO header for environmental monit...
by abelectronicsuk
Tue Mar 01, 2016 11:13 pm
Forum: Device Tree
Topic: Overlay to remap Pi 3 UART
Replies: 126
Views: 106197

Overlay to remap Pi 3 UART

On the Raspberry Pi 3 I want to be able to remap the hardware UART TX and RX from the Bluetooth module back to the old location on the GPIO header to use with addon boards which use these pins (xbee and another RF transmitter addon and also a RS485 board) and also disable the software uart from the ...
by abelectronicsuk
Tue Mar 01, 2016 5:35 pm
Forum: General discussion
Topic: Raspberry Pi 3 login via UART on GPIO Baud Rates broken
Replies: 15
Views: 41234

Re: Raspberry Pi 3 login via UART on GPIO Baud Rates broken

I have found a sort of fix but it drops the speed of the raspberry pi. If you edit /boot/config.txt and add core_freq=250 at the end of the file it will set the core frequency down to 250MHz and the UART port starts to work at the correct baud rate. The problem is the CPU frequency is now only 600MHz.
by abelectronicsuk
Tue Mar 01, 2016 2:03 pm
Forum: General discussion
Topic: Raspberry Pi 3 login via UART on GPIO Baud Rates broken
Replies: 15
Views: 41234

Re: Raspberry Pi 3 login via UART on GPIO Baud Rates broken

topguy wrote:And you have of course done a full "apt-get update + dist-upgrade" ?
Yes, all the updates are installed.
by abelectronicsuk
Tue Mar 01, 2016 1:50 pm
Forum: General discussion
Topic: Raspberry Pi 3 login via UART on GPIO Baud Rates broken
Replies: 15
Views: 41234

Raspberry Pi 3 login via UART on GPIO Baud Rates broken

My new shiny Raspberry Pi 3 arrived today and I tried to set it up as I normally do using a USB-UART adapter which plugs into the GPIO header. I use this as I don’t always have a network connection available and it’s easier to setup the static IP config and setup the wifi using the serial console wh...
by abelectronicsuk
Fri Feb 26, 2016 10:05 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3465
Views: 69595

Re: Introduce yourself!

Hello everyone, I’m Brian from the south coast in the United Kingdom. I have been playing with the Raspberry Pi range since they came out and had one running 24/7 since July 2012 as a solar power data logger http://www.briandorey.com/post/Raspberry-Pi-Solar-Data-Logger which was featured on Hackaday...

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