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by awjlogan
Thu Jan 05, 2017 12:36 pm
Forum: Wanted
Topic: Wanted: Ciseco (Wireless Things) SRF modules
Replies: 4
Views: 3471

Re: Wanted: Ciseco (Wireless Things) SRF modules

Thanks, sorry for slow reply, just getting back from Xmas!
by awjlogan
Sun Dec 11, 2016 1:03 pm
Forum: Wanted
Topic: Wanted: Ciseco (Wireless Things) SRF modules
Replies: 4
Views: 3471

Re: Wanted: Ciseco (Wireless Things) SRF modules

aBUGSworstnightmare wrote:Hi,
I have a new/unused SRF with chip antenna and a SRF stick which were no longer needed.
WP_20161211_09_24_39_Smart.jpg
Let me know if you're interested in (located in Germany)
Sent you a message, would be very interested thank you :)
by awjlogan
Sat Dec 10, 2016 8:17 pm
Forum: Wanted
Topic: Wanted: Ciseco (Wireless Things) SRF modules
Replies: 4
Views: 3471

Wanted: Ciseco (Wireless Things) SRF modules

Hello - I was looking to finish off a couple of projects over the holidays and went to get a couple of the Wireless Things (formerly Ciseco) SRF surface mount modules. It turns out the company has gone under, sadly. I'm looking for 3 SRF modules, happy buy in single quantity as well. If you have any...
by awjlogan
Mon Jan 18, 2016 8:24 pm
Forum: Other projects
Topic: Raspberry Pi Eagle PCB CAD footprint
Replies: 20
Views: 55437

Re: Raspberry Pi Eagle PCB CAD footprint

For anyone interested, I have just uploaded a footprint of the Zero (link is below). Format is Eagle 7.3.0, and I'll add the others later this week. Any questions, just let me know :)

https://github.com/awjlogan/awjlogan_eagle_lbr
by awjlogan
Tue Nov 11, 2014 3:09 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Apologies for the very slow updates - I've just moved country and am lacking in certain workshop essentials. First board is nearly built up, and of course a few problems cropped up, namely device packaging (wrong footprints) but otherwise pretty smooth. Once I've got some replacement parts ordered, ...
by awjlogan
Fri Oct 03, 2014 12:46 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

3A is basically what the switching supply is set up for at it's maximum. I went with that so peripherals could be powered without worry, and so 3 A continuous is probably pushing it a bit. A Schottky is a drop in replacement, so you could save a bit of power there. I like that component you linked, ...
by awjlogan
Fri Oct 03, 2014 2:36 am
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Oooh, shiny! By the way, what were you planning on using to provide the 9V supply from the mains? Heh, it's a trick of the light, honest ;) Probably a decent 9 V supply, such as this one . That's pretty heavy duty, so up to the user really. The trickle charger is only 50 mA, so you can cut back to ...
by awjlogan
Fri Oct 03, 2014 2:28 am
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Thanks for the interesting step through of your design on your blog! It was enlightening, and also seems well-suited for my use case. Any news from the testing front? Well, the boards arrived yesterday, so good timing! Very glad you liked the blog posts, hopefully I'll be able to get these made up ...
by awjlogan
Sun Sep 21, 2014 7:42 pm
Forum: Other projects
Topic: Mini-UPS and power management
Replies: 2
Views: 1668

Re: Mini-UPS and power management

I'm in the middle of a simple UPS design for the Pi. Definite scope to add some more functionality to it, my original aim was to keep it as simple as possible and avoid onboard microcontrollers etc. Look forward to hearing some ideas :) http://awjlogan.wordpress.com/2014/08/07/raspberry-pi-hats-comp...
by awjlogan
Mon Sep 08, 2014 12:26 am
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Ok, the final part regarding the circuit design is now here :) Questions and suggestions welcome!

I've ordered some boards, so next up will be the build and testing.
by awjlogan
Sat Aug 23, 2014 4:26 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

mahjongg wrote:I get why you use the shunt regulator for a precision 3v3, but why power the eeprom with the precision voltage too, instead of the normal 3v3 voltage from the PI?
Good suggestion - I hadn't thought of that, that would certainly allow a few extra mA to be trimmed off the shunt if required. Thanks :)
by awjlogan
Sat Aug 23, 2014 1:46 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

There's been a steady trickle of interest, so I'm pressing on. I guess people want to see a board soon! While writing things up, I've come across problems and simplifications, so it's been a good process for me as well. In this part, the supply source and battery state indication are developed. I've...
by awjlogan
Sat Aug 16, 2014 7:35 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

I've started writing up a more detailed explanation of the component choices. It turned out to be more in depth than I'd anticipated, so for the time being I've only written about the trickle charger. You can find the full write up here on the Wordpress site . I've updated the layout and schematic w...
by awjlogan
Sun Aug 10, 2014 1:10 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Any more comments or suggestions? I'm going to write up part II over the next few days, so any input would be great!
by awjlogan
Thu Aug 07, 2014 3:30 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

Re: A simple and cheap uninterruptible power supply

Thanks for the reply - I'll go through top to bottom [C]hosen battery, it appears to be a 12v one. How, then, does your 9v source charge it? Or have you gone for a lower-voltage battery? Yes, I should have made that clear. This was intended for use with 3-cell lead-acid batteries, so the nominal vol...
by awjlogan
Wed Aug 06, 2014 11:50 pm
Forum: Other projects
Topic: A simple and cheap uninterruptible power supply
Replies: 16
Views: 6655

A simple and cheap uninterruptible power supply

Hello all - I had a couple of weeks off recently, which happily coincided with the release of the HATS specification (which is a great initiative!). There are a few UPS boards you can buy out there, but they're incredibly expensive (more than the Pi itself) for what they are and overly complicated. ...
by awjlogan
Mon Mar 10, 2014 7:27 pm
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Re: Soft power switch - Pi2RMini

So I've been playing around with it some more. Unfortunately as it stands, there are a few problems on the software side, mainly involving the board to board communication. The hardware's working nicely (which is good news), and I'll post up the corrected software as soon as possible!
by awjlogan
Sat Mar 08, 2014 8:41 am
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Re: Soft power switch - Pi2RMini

sammonroem wrote:I would love to try and intergrate this into my project if it is still availible
It is - send me a PM with your details, and I'll get it in the post for you.
by awjlogan
Fri Mar 07, 2014 12:27 pm
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Re: Soft power switch - Pi2RMini

hampi wrote:That looks interesting. Would it be too much work to put the circuit diagram as a pdf or a png file to the repository?
No bother, just done it. https://github.com/awjlogan/Pi2RMini/bl ... %20sch.pdf
by awjlogan
Wed Mar 05, 2014 9:52 pm
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Re: Soft power switch - Pi2RMini

I know the feeling well :roll: No other takers?
by awjlogan
Tue Mar 04, 2014 3:39 pm
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Re: Soft power switch - Pi2RMini

I have one spare board as well (the unbuilt one in the picture), free to the first person (in the UK) who wants it! Can put the programmed microcontroller on it if you want as well.
by awjlogan
Sun Mar 02, 2014 12:19 am
Forum: Other projects
Topic: Soft power switch - Pi2RMini
Replies: 12
Views: 2098

Soft power switch - Pi2RMini

Hello all - I've just finished and put up the files and information for a small board to act as a proper soft switch. I have my RasPi set up as an MPD server, but it's was getting to be a nest of wires and having to SSH in each time to turn it off, and then unplug/plug it in to start it again was ge...

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