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by fixitsan
Wed Oct 02, 2013 7:15 am
Forum: Beginners
Topic: Need some answers. asap
Replies: 1
Views: 358

Re: Need some answers. asap

The type of connection method is largely dictated by the interface with yoiur GSM module. Does your module have serial tx/rx pins ? Does it have SPI ? Does it have I2C ? (probably not I2C but it could happen) (tx/rx = transmit/receive) Once you know what inerface is built into the GSM module, which ...
by fixitsan
Tue Oct 01, 2013 9:27 pm
Forum: Beginners
Topic: Battery Powering the PI
Replies: 10
Views: 2297

Re: Battery Powering the PI

The 3-legged voltage regulators are called linear regulators. While they do work, they can be wasteful of power (not ideal for portable devices), plus you must use an input voltage which is higher than their output voltage, by at least 1V or more. (so EG for a 12V regulator you need at least 13V inp...
by fixitsan
Tue Oct 01, 2013 8:38 am
Forum: Beginners
Topic: Battery Powering the PI
Replies: 10
Views: 2297

Re: Battery Powering the PI

I seem to be having trouble editing my previous message so..... The important figure you need to specify is the maximum continuous discharge current. You can buy some cells which claim to have high capacities, but when yoiu check their discharge rates they con only discharge at 0.5C rate before they...
by fixitsan
Tue Oct 01, 2013 8:30 am
Forum: Beginners
Topic: Battery Powering the PI
Replies: 10
Views: 2297

Re: Battery Powering the PI

Just thinking some more..... It might be a good idea to pick a convenient voltage somewhere between the two yoiu require. RC model batteries are readiliy available int he 6 - 10V range and some store huge amounts of energy. Then run the lcd from a step up convertor like this http://www.ebay.co.uk/it...
by fixitsan
Tue Oct 01, 2013 8:08 am
Forum: Beginners
Topic: Battery Powering the PI
Replies: 10
Views: 2297

Re: Battery Powering the PI

Hi, it all depends on how long you need battery support for ? 1A at 5V = 5W, which in one hour is 5Wh of energy required. 1A at 12v = 12V, which for one hour is 12Wh of energy required Total requirement for 1 hour = 17Wh A typical alkaline AA cell can store about 2.6Wh. A D-cell alkaline can give 20...
by fixitsan
Mon Sep 30, 2013 9:25 pm
Forum: Beginners
Topic: Public Twitter to UART
Replies: 1
Views: 392

Re: Public Twitter to UART

Replying to my own topic...that must be a sign of something ! I've just found the urllib2 module. And I've just managed to achieve reading the BBCNEWS public twitter feed, without any special effort, all in (*and I am still struggling to believe it*) 2 lines of code, I've just bypassed hundreds of l...
by fixitsan
Sun Sep 29, 2013 6:05 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3632
Views: 178828

Re: Introduce yourself!

Hi All I'm Chris Barron, from West Lothian, Scotland (Near Edinburgh) An engineer to trade, have been programming in the pic world for many years (assembler and picbasic pro) and am now undertaking a project which is going to be nightmare with a pic and seems to be so easy with a piece of pi that I ...
by fixitsan
Sun Sep 29, 2013 5:12 pm
Forum: Beginners
Topic: Public Twitter to UART
Replies: 1
Views: 392

Public Twitter to UART

I have a project requiring me to send serial data at 9600, 8N1, to an electronic display module (made of vintage neon nixie tubes). I was originally making an RSS feed reader to capture news stories and display them on the scrolling display. Over time though, RSS seems to be becoming less popular an...

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