Archive for November, 2007
Monday, November 26th, 2007
PIC, SPI and the RFM12
I finally had some time this weekend so I started the hardware verification, mainly getting the PIC and the RFM talking together via SPI, of which I have had no previous experience. The PIC is receiving it’s clock source from the RFM12 via the CLK pin so I dont need any external Xtals. The RFM12 default clock rate [...]
3 Comments » - Posted in C, EbayTrigger, Embedded, PIC, RF, strobist by Stephen Eaton
Tuesday, November 20th, 2007
RFM12 Prototype Board
The RFM12 module is a pain to prototype with due to the 2mm header (won’t fit into the breadboard), so I’ve whipped up a prototyping board that brings out the pins to a standard header. It’s been it sent off for fabrication today so I should have back in the next week or so. I’m trying out www.batchpcb.com for [...]
No Comments » - Posted in Eagle, Embedded, RF by Stephen Eaton
Monday, November 19th, 2007
Frequency Hopping
As mentioned in my last entry I was toying with the idea of frequency hopping on the RF side of things, well looks like someone has implemented something similar here http://www.raccoonrezcats.com/rfmodem.html I’ll like to do something similar to this as it seems doable.
While not able to get some “hands on” development time over the weekend, I did [...]
7 Comments » - Posted in EbayTrigger, RF by Stephen Eaton
Friday, November 16th, 2007
More challenges but getting there
Trying to fit the functionality into the existing ebay trigger receiver housing seems to be a royal pain in the butt, especially trying to work in with the batteries, so after a few days of PCB redesigns and juggling compments around I have put that particular design on hold and moved forward with my original PIC16F873A [...]
No Comments » - Posted in EbayTrigger, Embedded, PIC, RF by Stephen Eaton
Thursday, November 8th, 2007
EBAY Trigger Receiver PCB
A couple of design changes, main one being I could not physically fit a single design into the existing housings that would encompass the Tx and RX, the RX housing is the problem as it’s a fairly small board so that means I’ve had to change the processor so that I can physically fit everything as [...]
No Comments » - Posted in EbayTrigger, PIC by Stephen Eaton
Monday, November 5th, 2007
Initial Design
I’ve put an initial design (both eagle source files and PDF) into SVN that is aimed as a board replacement to the ebay triggers.
http://svn.everythingrobotics.com/strobist/mk1/trunk/design/ebay_trigg.pdf
No Comments » - Posted in Eagle, PIC, strobist by Stephen Eaton
Thursday, November 1st, 2007
Eagle Library
As i’ve started using Eagle as my electronic design package (protel is fantastic but just too expensive), I’ve created a component library that I’ll be using on the Strobe trigger project. I’ve put the library in SVN for everyone to use and contribute towards -http://svn.everythingrobotics.com/strobist/eagleLib/
