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by Gert van Loo
Mon Jan 09, 2012 8:18 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

<t><br/> (Some of the tracks on the PCB look a bit random – are there really several that are completely unconnected or am I just being thick or blind?)<br/> <br/> <br/> You are probably seeing the copper fill tracks. I put some copper 'stripes' down in areas which have nothing to get a better resul...
by Gert van Loo
Sun Jan 08, 2012 10:28 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

<r>SeanD said: <br/> <br/> <br/> Gert, you know how when you get to the end of a Youtube it show you recommendations?  How come this one for a Zomie Killing Slingshot is connected to the Gertboard?<br/> <br/> <URL url="http://www.youtube.com/watch?f.....240YgsA_rs">http://www.youtube.com/watch?f.......
by Gert van Loo
Sun Jan 08, 2012 6:19 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

Youtube shows working Gertboard.

feature=youtu.be
by Gert van Loo
Sun Jan 08, 2012 12:37 pm
Forum: Staffroom, classroom and projects
Topic: Teaching Real-time Systems
Replies: 14
Views: 6755

Re: Teaching Real-time Systems

<t>FatBuzz said: <br/> <br/> <br/> ...<br/> <br/> It may have been here on the forum that I read that all GPIOs can generate interrupts but as we have so little info on the GPIO, I2C, SPI and UART interfaces that"s difficult to be sure about. All will become clear in the near future.<br/> <br/> <br/...
by Gert van Loo
Sun Jan 08, 2012 10:08 am
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 53805

Re: Easy GPIO Hardware & Software

0.1 inch.
by Gert van Loo
Sun Jan 08, 2012 9:12 am
Forum: Off topic discussion
Topic: Linking a Pi to the Physical world
Replies: 12
Views: 3673

Re: Linking a Pi to the Physical world

Just as a small note: Yes the Raspberry-Pi has DMA on most interfaces. It has it on PWM, UART, SPI, and I2C.
by Gert van Loo
Sat Jan 07, 2012 10:14 pm
Forum: General discussion
Topic: Raspberry Pi #1 spotting...
Replies: 53
Views: 12163

Re: Raspberry Pi #1 spotting...

I never liked the whole sniping idea.

I do use go-industry but they have a different rule: any bid in the last 10 minutes extends the time by another 10 minutes. Gives better result for the seller.
by Gert van Loo
Fri Jan 06, 2012 9:26 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

<t><br/> I take it that the DA and ADC chips are [able to be] linked directly to the R-Pi GPIO, so you could by pass the whole PIC section if that was all you needed to start with?<br/> <br/> <br/> Yes the AD & DA have an SPI interface. Which gives a slight challenge if you want all three SPI de...
by Gert van Loo
Fri Jan 06, 2012 9:03 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

A lot of users forget that the raspberry-Pi boards come default without connector.

So you can not use the Gertboard without picking up a soldering iron even if it is ready made.
by Gert van Loo
Fri Jan 06, 2012 12:17 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

<t>Gertboard update.<br/> <br/> For those of you who follow this thread: I have just finished a major change to the Gertboard rev-2. A lot of feedback was that people wanted to play with sensors and I have not seen anybody who was waiting for lots of I/O. So I decided to remove the Maxim chip and re...
by Gert van Loo
Thu Jan 05, 2012 11:58 pm
Forum: General discussion
Topic: BCM2835 Questions
Replies: 31
Views: 11328

Re: BCM2835 Questions

<t>It is the security system which surrounds the ARM and everything connected to the ARM. I am not impressed with the ARM trustzone. Security was not embedded in the ARM from the beginning. What I have seen looks like some blocks have been thrown in as an afterthought and connected up with sellotape...
by Gert van Loo
Wed Jan 04, 2012 10:34 pm
Forum: General discussion
Topic: Mounting The Pi PCB
Replies: 14
Views: 4304

Re: Mounting The Pi PCB

Piglet said:


Would any of these be usable do you think? Not sure where you get such things retail in very small numbers:


Hey! Never seen those before. They look interesting. I'll will see what they costs and in what quantity.
by Gert van Loo
Tue Jan 03, 2012 10:10 pm
Forum: General discussion
Topic: Audio options...
Replies: 14
Views: 5537

Re: Audio options...

There is no ANALOGUE audio input.

It has PCM and I2S. I have been thinking of making a follow up of the Gertboard which has only two devices: Real time Clock and Audio codec.
by Gert van Loo
Mon Jan 02, 2012 5:48 pm
Forum: Other projects
Topic: Programmer for uC's
Replies: 4
Views: 1656

Re: Programmer for uC's

<t>I know where you come from. Yes, there are lot out there and I have used a few. But most of them have a terrible low performance and are often ten time the price of a Raspi. Very few offer Ethernet so you have to have the PC close to it.<br/> <br/> One problem is that the debug interface is often...
by Gert van Loo
Mon Jan 02, 2012 12:18 pm
Forum: Other projects
Topic: Audible Tech-Support Monitor
Replies: 3
Views: 1470

Re: Audible Tech-Support Monitor

I am curious how many mega watts the Raspberry-Pi will save in the coming years with lots of user swapping big power hungry boxes for a tiny Pi.
by Gert van Loo
Sat Dec 31, 2011 4:28 pm
Forum: Off topic discussion
Topic: These little mathematical conundrums
Replies: 12
Views: 2308

Re: These little mathematical conundrums

<t>I have a small C-program which generates quadratic equations (With nice whole number and real solutions). It is very simple as I generate the values A, B, C and D for the formula: (Ax+B)(Cx+D). Then calculate the equation from that. It has four levels of complexity. Simplest has A=C=1, B and D  p...
by Gert van Loo
Sat Dec 31, 2011 12:57 pm
Forum: Other projects
Topic: Home automation via Zigbee
Replies: 9
Views: 43087

Re: Home automation via Zigbee

Or connect a zigbee device to the GPIO. e.g. use the SPI port to talk to a zigbee chip.
by Gert van Loo
Sat Dec 31, 2011 10:13 am
Forum: General discussion
Topic: Raspberry pi robot
Replies: 3
Views: 2053

Re: Raspberry pi robot

<t>I would use the 'divide and conquer' method: Use the Raspberry pi for the high level commands and control the hardware (all real-time signals) with local controllers. My approach would be a separate controller per motor. (You can get a cheap controller for $2, which is significant less then your ...
by Gert van Loo
Thu Dec 29, 2011 8:38 pm
Forum: Off topic discussion
Topic: Will it work ?
Replies: 3
Views: 1310

Re: Will it work ?

Wel… a good improvement would be a section that goes: Do you know how to make hardware? ->No: Pay Gert a lot of money to develop it for you
by Gert van Loo
Thu Dec 29, 2011 8:24 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 116169

Re: Gertboard

<t>I am not yet sure what comes after the Gertboard. There are the two usual factors: Time and Money.<br/> <br/> I am not sure how much time I will have. I started the Gertboard as a small project but the response is so much bigger then anticipated that I feel oblidged to put a lot more work in they...
by Gert van Loo
Thu Dec 29, 2011 7:54 pm
Forum: Other projects
Topic: Bramble cost estimates
Replies: 11
Views: 6340

Re: Bramble cost estimates

<t>I think it mostly depends on what you want to achieve.<br/> <br/> What I have seen form other posts is that the Raspberry-Pi is not the right machine if you want to have the highest number if MIPS per buck.<br/> <br/> However if you look at the MIPS per watt I think the Raspberry-Pi is probably f...
by Gert van Loo
Thu Dec 29, 2011 7:38 pm
Forum: General discussion
Topic: Power Flow-chart
Replies: 24
Views: 6816

Re: Power Flow-chart

No DSI/CSI do not require 5V. The MIPI PHY specification has an upper limit of 600mV. (That is signaling level + common mode voltage). I guess you can make a phy run from as little as 1.2 V.

As to USB and no 5V: I said that you can probably run of 3.3V Ifyou do not use USB/Ethernet.
by Gert van Loo
Thu Dec 29, 2011 1:36 pm
Forum: Other projects
Topic: Spoofing an IR receiver to connect to an amp
Replies: 7
Views: 3123

Re: Spoofing an IR receiver to connect to an amp

<t>I have tough about doing it using an SPI output. I did not try it but I think it can be done. Most SPI interfaces support 32 bits. To transmit 10 IR bits you take 30 bits and divide them up in 3-bit sequences. So you set the SPI clock to triple the baud rate. Then you set one? two? bits high of t...
by Gert van Loo
Thu Dec 29, 2011 1:28 pm
Forum: Other projects
Topic: Down to the metal?
Replies: 10
Views: 3152

Re: Down to the metal?

<t><br/> then save a binary file which is then loaded at next boot<br/> <br/> <br/> One of the many charming features of the Raspberry-Pi system is that all software gets loaded from the SD-card. So as JamesH says: you just put your code on a separate SD-card and boot from it. To restore your system...
by Gert van Loo
Thu Dec 29, 2011 1:14 pm
Forum: General discussion
Topic: ADD IR RECEIVER to USE RBP AS VIDEO PLAYER
Replies: 14
Views: 9192

Re: ADD IR RECEIVER to USE RBP AS VIDEO PLAYER

<t>For those of you who are not familiar with IR: The electrical protocol is close to that of a UART (start, data, stop) but with the major difference that the signal is RZ (Return to Zero) and has a narrow pulse width. To forestall the question: No, there is no way to use a standard UART to receive...

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