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by schlomo
Sat Apr 07, 2012 5:32 pm
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

LinuxGuru said:


Any updates for this project? Estimated delivery time and price?


We"'re working on it. We"'ve setup a website where we'"ll put status updates and more info: http://deltaboard.org
by schlomo
Sat Apr 07, 2012 3:52 am
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

<r>ringz said: <br/> <br/> <br/> Some people have begun moving towards the Atmel ATmega1284p chip because it"s the most complex of the arduino compatible chips currently available in a 40 DIP package. Much easier to solder and there is 3rd party support for it in the Arduino 1.0 IDE.<br/> <br/> <URL...
by schlomo
Tue Apr 03, 2012 4:19 pm
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>Condemned said: <br/> <br/> <br/> Why a mini USB connector?! Surely the whole world is going micro.<br/> <br/> Why not use a smaller (cheaper) XMega32A4U? It has 34 I/O lines. Or is there a specific application you're looking at that needs more SRAM / flash?<br/> <br/> <br/> I guess--although for...
by schlomo
Tue Apr 03, 2012 4:12 pm
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>Adnan said: <br/> <br/> <br/> There's no mention, but if you can squeeze in: please break out RasPi's console through a RS232 level translator. It doesn't have to have a clunky DB9 connector (I dislike them anyway), just a micro 3-pin JST will do and let the user decide on the final-mile connecto...
by schlomo
Tue Apr 03, 2012 4:11 pm
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>hzrnbgy said:<br/> <br/> <br/> Since you have a pretty beefy MCU, how about including a bunch of peripherals on board so users don't need to have flying wires all over the place.<br/> <br/> Good additions would be<br/> <br/> RTC (the xmega has built in RTC32 by the way)<br/> <br/> Hi-capacity SPI...
by schlomo
Tue Apr 03, 2012 2:59 am
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4352

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>Deltaboard is an AVR-based expansion board for the Raspberry Pi computer. The goal of the Deltaboard is to design a highly efficient and flexible interfacing board with a variety of uses. Not only will it breakout digital I/O, SPI, I2C, UART, and analog I/O, but it will also allow you to efficien...
by schlomo
Mon Feb 13, 2012 12:48 pm
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

Adding Arduino shield compatibility would be great, but would make the board a bit more complex... the Arduino headers and the deltaboard header would make it much harder to wire. But the promise of using any Arduino shield will make up for that!

by schlomo
Mon Feb 13, 2012 3:30 am
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

Here's the latest design sketch of the board (tentatively being called the deltaboard). I've decided that it would probably be better to mount directly onto the Rasp Pi like a backpack (so you don't have to mess with separate UART/SPI wires).

by schlomo
Sat Feb 04, 2012 3:25 am
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<t>Thanks for the help error404 and plugwash. After playing around with WEBENCH, I've finally got a nice switched-mode power supply circuit designed. It has over 91% (!) efficiency and costs about $3.00. The problem: total (max) power dissipation is 700mW [when input voltage is 18v and outputs 5v/1....
by schlomo
Fri Feb 03, 2012 1:25 am
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<t>error404 said: <br/> <br/> <br/> DeliciousRaspberryCake said: <br/> <br/> <br/> It makes absolutely NO sense to pay $3.41 , $6.89 or even $15 for a single component, which might need several additional components and a circuit board to put them all on. (components are really expensive when bought...
by schlomo
Fri Feb 03, 2012 1:09 am
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<r>DeliciousRaspberryCake said: <br/> <br/> <br/> nullstring said: <br/> <br/> <br/> For what it's worth, this one looks interesting to me:<br/> <br/> <URL url="http://search.digikey.com/us/e.....ND/1816645">http://search.digikey.com/us/e.....ND/1816645</URL><br/> <br/> I wouldn't spend much more th...
by schlomo
Thu Feb 02, 2012 10:52 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<r>This looks like the ultimate switching regulator IC:<br/> <br/> <URL url="http://www.linear.com/product/LTM8032">http://www.linear.com/product/LTM8032</URL><br/> <br/> It's a completely integrated, 3.6-36V input, 0.8-10V/2A output, low noise regulator. No other inductors, diodes, etc are required...
by schlomo
Thu Feb 02, 2012 4:05 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<t>nullstring said: <br/> <br/> <br/> schlomo said: <br/> <br/> <br/> Ah, okay. Thanks for the clarification from error404, Abishur, and Gert.<br/> <br/> I'm planning to use a 1.5A (3A trip) polyfuse and a 5v LDO (something like this) to convert a 3-cell LiPo input voltage (max around 11.1v) to a re...
by schlomo
Thu Feb 02, 2012 3:15 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<t>Ah, okay. Thanks for the clarification from error404, Abishur, and Gert.<br/> <br/> I'm planning to use a 1.5A (3A trip) polyfuse and a 5v LDO (something like this) to convert a 3-cell LiPo input voltage (max around 11.1v) to a regulated 5v signal to power both an ATmega1284P and the Rasp Pi. Is ...
by schlomo
Wed Feb 01, 2012 9:31 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 7726

Re: Can you power the Pi from GPIO?

<t>Hi,<br/> <br/> I'm making a microcontroller breakout board for the Pi. I plan to connect a Lipo to the breakout board, regulate the voltage to 5v, then use that to power the Pi. Like this:<br/> <br/> LiPo –> Regulator on breakout board –> Pi GPIO 5v pin<br/> <br/> Will it be possible to power the...
by schlomo
Tue Jan 31, 2012 11:22 pm
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

Here's my latest sketch of the board and some pinouts:

by schlomo
Tue Jan 31, 2012 11:09 pm
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

paddyg said:


Or you could get a nano clone from ebay for $15 and use the usb. More purist to use the pins outs really.


Yeah, but that's too easy!
by schlomo
Tue Jan 31, 2012 11:08 pm
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

<t>abqlewis said: <br/> <br/> <br/> I like the idea, but just one thing.  Why not communicate using SPI instead of the UART?   I remember reading somewhere that the GPIO UART will output boot messages, and then can be used as a console.  I was thinking this would be great to use for headless operati...
by schlomo
Tue Jan 31, 2012 3:20 am
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8716

Re: Arduino-like custom breakout board

<t>Hi. I''m planning to make an Arduino-like breakout board customized for the Raspberry Pi. It would have features like the GertBoard, but would be more microcontroller driven, instead of being a buffer I/O board. Additionally, it would allow the Raspberry Pi to be powered up only when needed (e.g....

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