[beagleboard] Re: Announcing $25 PocketBeagle
Missing from the FAQ: What are the minimum power supply requirements? Looking at the board, there's no external power plug so I'm assuming everything comes via USB. USB supplies have limits, so before I go making additions that draw 2.5A it would help to know if my 2.6A supply is good enough. [If the the PocketBeagle needs more than 0.1A, the answer would be "no"] On Friday, 22 September 2017 01:05:38 UTC+9:30, Jason Kridner wrote: > > https://beagleboard.org/pocket > > Trying to get a few things documented at > https://github.com/beagleboard/pocketbeagle/wiki/FAQ, so feel free to > start throwing out questions here, on IRC or on the github site. > > > -- > https://beagleboard.org/about > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/36f7e702-c212-4628-bab9-a8e89d332d9f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Kickstarter Project: BeagleCore - miniaturized computer module compatible with BeagleBone Black
Thats... interesting. Like a Pi Compute Module, without the DIMM connector. I'm not sure how you are expected to connect this to anything. The Kickstarter showsa graphic of a spinning board, and the underside seems to have a series of empty pads. So maybe you are expected to surface mount it, like a big BGA. Unfortunately, the same graphic shows a bunch of SMD cpacitors on the bottom side. Making a flush mount impossible. Maybe you are expected to drill a series of relief holes in your carrier board? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Future of BeagleBone (Black)?
If small is a relative term, and BBB cape compatibility is not on the table, can you aim for slim? By which I mean - no double height USB connectors, etc. Apple have a lot to answer for, making laptops and phone thinner every year. The problem is, customers start to want thin even when there's no real need. Using a folded cable to put an LCD on the back of a Dev board helps, and side-mount expansion sockets help too. --Alan Campbell -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Re: BeagleBoard-X15 - seriously? :)
I must admit to a little curiosity about the design process. Is there a particular reason to avoid DIMM socket RAM? I find the idea of recycling old PC RAM, or buying new from a PC shop, rather appealing. I get a cheap(er) board, can upgrade, and can even venture into overclocking... -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Welcome the Fall 2014 Beagle Class to the group
As a shift worker (in Australia too) this looks like a great set of notes, to go through in my own time. As for subjects to cover... hmmm. The BBB with GPIO pins lets you toggle single pins at a fair rate, with minimal effort. What about groups of pins? 4 bits wide helps some LCD controllers, 8 bits is common for data, DACs can be 12 bits or more. How fast can you read? There are plenty of questions about speed limit of reading BBB ADC inputs. If students have access to test equipment, it can be educational to measure the speed at which you can toggle a single pin, and compare that to the clock rate of the CPU. - - Alan Campbell -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: RIP Never Used BBB
I must admit, I have often wondered if anyone will create a mains-powered supply with +5V and +3.3V output. Designers would still need the occasional 2.4 and 1.8V regulators but overall design should be simpler. Board costs less, supply costs more - may include features like shutdown under software (shutdown -h now) Could be used with other dev boards : Arduino, Pi, etc. Add a HDD compatible connector for future expansion, or the Cubieboard which already has SATA. Would you buy such a dev board / supply combination? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBoard Data Acquisition Platform
Aah now I see. Using multiple channels to search for signals buried in noise. Like the phase array of antennas used in the WERA radar system: http://www.aslenv.com/WERA.html Whereas my own desires are based on the Red Pitaya: http://redpitaya.com A lovely bit of kit, if you can spare $500+ and don't mind Yet Another ARM Processor [built into the FPGA chip]... For more modest requirements, this should be do-able as an extension to the Beaglebone series. A quick check of TI's selection table found the ADS4145http://www.ti.com/product/ads4145and ADS4245 [1 and 2 channel version, 125M, 14-bit]. Analog Devices have the AD9648-125http://www.analog.com/en/analog-to-digital-converters/ad-converters/ad9648/products/product.html, and Linear Technology have the LTC2145-14http://www.linear.com/product/LTC2145-14. Feel free to look them up if you're curious about how they work: I consider much of that magic smoke As for WHY I want one - primarily, RF signal analysis. 120 Msample/sec lets you grab from DC to 30MHz, with simple filtering. You can also monitor FM bands [88-108MHz] which fall in the 2nd Nyquist sample zone and get reflected down to 12 - 32 MHz Oh, and amateur radio and weather satellites, in the band 140 - 150 MHz, can be under sampled at 25 - 30MHz. Not to mention being able to cover 40MHz of bandwidth, such as WiFi, by adding a mixer / downconverter. It's all Software Defined Radio, or SDR. There are $20 USB dongles, but they lack the frequency range and bandwidth I'm talking about. Regards, -- Alan [SA-Penguin] -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] BeagleBoard Data Acquisition Platform
32 channels is - a lot. At 16-bit, too. On the other hand, the actual sample rate is quite low: 200K sample/sec This sounds like the backbone of a 32-channel audio mixing desk. Which is fine, if that's what you are into... Personally, I'd prefer 2 [or even 1] ADC channel, with a MUCH higher sample rate. Say: 120 M sample/sec. Sure there are faster ADC's - but original [parallel] ATA cables were rated to 133MHz, so I'm aiming for a spec that reduces the need for matching length tracks etc. You'd probably need an FPGA to interface that with a Beagleboard, or Beaglebone Black [my device]. -- Alan On Wednesday, 12 May 2010 05:04:07 UTC+9:30, Ben Gamari wrote: Hey all, For those who care, I have drawn up designs for the second iteration of my BeagleBoard-based data acquisition platform[1]. This new design features 32 DAC channels and 32 ADC channels, both with 16-bit resolution. The ADC sampling rate is a little lower than I would have liked at 100ksamples/second (with the SPI bus running at 2MHz), but this should be more than enough for most tasks. The DACs on the other hand can run at up to 20MHz (limited by the level shifters). Additionally, the board now exposes 8 GPIO pins behind a level shifter, making it possible to directly interface with standard 5V TTL levels. The ADC part I'm using is TI's ADS8344 and the DAC is TI's DAC8568. The level shifters are TI's TXB0108 and the demultiplexer used for chip select is TI's SN74AHC139. Altogether, the board is quite expensive. Each of the four DACs are $25.00 and each of the four ADCs are $10. Thus, a fully populated board is about $150 in parts alone. Far more expensive than I was hoping for, but it seems that these prices are pretty common in the world of converters. The board is designed to fit on a BeagleBoard XM-style expansion connector and thus sits beneath the BeagleBoard. One issue I encountered with the last design[2] was the large in-rush of current at startup which seems to cause the BeagleBoard to brown-out. This makes it necessary to remove the board while starting up the BeagleBoard. While I'm not certain of the cause of this, I suspect that the largish filter capacitors (330uF IIRC) on the voltage rails might be at least in part to blame. Anyone have any thoughts on this? I've reduced the value of these to 100uF, but it would be nice to have a slightly more certain solution. If anyone has any comments, I would love to hear them. I think this design is orders of magnitude better than the original, but there is no doubt still room for improvement. In particular, I would love to hear suggestions about the PCB layout. I took some steps to ensure good analog characteristics (e.g. maintaining continuity in the ground plane), but I'm sure there are other things that could be improved. Moreover, the reference supply is little more than a RC filter. Is this sufficient or could there be a better option here (perhaps an active voltage reference or Zener regulator)? Anyways, I look forward to hearing any feedback that folks have. Thanks for listening. Cheers, - Ben [1] http://goldnerlab.physics.umass.edu/wiki/BeagleBoardDaq [2] http://goldnerlab.physics.umass.edu/wiki/BeagleBoardDaq/Version1 -- You received this message because you are subscribed to the Google Groups Beagle Board group. To post to this group, send email to beagl...@googlegroups.comjavascript:. To unsubscribe from this group, send email to beagleboard...@googlegroups.com javascript:. For more options, visit this group at http://groups.google.com/group/beagleboard?hl=en. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Who has BBB in stock?
3,000 x $45 = $135,000 per week, or $7,020,000 per year. Everyone goes on about the Raspberry Pi but the BBB isn't exactly standing still. Mine took ages to turn up - it was worth the wait. -- Alan On Thursday, 19 December 2013 00:37:46 UTC+10:30, Gerald wrote: We are shipping right at 3,000 per week. As you can see, there is still no stock. Gerald -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[beagleboard] Re: Is it possible to run BBB off cheap rechargeable batteries?
Check out the following article: http://pansenti.wordpress.com/2013/06/01/battery-powered-beaglebone-black-and-the-usb-host-port-works-too/ He starts with a 3.6V LiPo battery, and uses the BBB on-board regulator to create 3.3V. Unfortunately, this leaves out the USB circuits that want 5V. The article in the link includes a booster circuit, to generate the 5V for USB -- Alan Campbell On Sunday, 10 November 2013 12:39:56 UTC+10:30, rowland@gmail.com wrote: I have been trying to figure out a way to run the BBB off cheap rechargeable batteries, either 9V or 6 to 8 AAs. I have been successful in running the BBB off a 3-cell Lipo with a 7805 5V regulator circuit. However, when I use the same design with cheaper batteries the board continuously reset. My suspicion is that the batteries can not provide the necessary current. Does anybody know of the BBB working with cheap rechargeable batteries? And if so, what is the power supply circuit design that is used? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
