Ideas - Revision history

Guestblinky: repairability

2025-02-11T00:36:29Z

repairability

DavidCary: link to more quasi-standard power jack ideas

2023-11-14T00:18:35Z

link to more quasi-standard power jack ideas

DavidCary: link to article that goes into more detail, etc.

2015-11-11T16:15:30Z

link to article that goes into more detail, etc.

DavidCary: mention overheating

2014-09-01T17:03:09Z

mention overheating

DavidCary: "bus termination" page?

2014-04-19T20:14:22Z

"bus termination" page?

DavidCary: clarified (I hope)

2014-04-19T19:33:57Z

clarified (I hope)

75.145.205.177: Electronic Legos

2012-02-25T03:42:38Z

Electronic Legos

DavidCary: mention one connector that already implements this

2011-10-16T11:45:38Z

mention one connector that already implements this

Outerspace78 at 15:55, 11 February 2011

2011-02-11T15:55:07Z

Outerspace78 at 12:17, 11 February 2011

2011-02-11T12:17:12Z

@@ Line 6: / Line 6: @@
 * [http://visualthinkingart.blogspot.com/2006/01/portable-context-device.html Portable Context Device]
 * Open power connector for [[mobile phone]]s, [[PDA]]s and laptops. ''(Wikipedia lists [http://en.wikipedia.org/wiki/DC_plug a variety of connectors] -- or were you looking for an AC [http://en.wikipedia.org/wiki/Power_connector power connector]? What sort of specification do you want?)''
-*  "Open Source Disability Gadgets: DIY for PWD" [http://panelpicker.sxsw.com/ideas/view/1745] "Gear and software for people with disabilities is usually provided through charity or from medical supply companies. It's hard or impossible to repair it, or get anyone to repair it. We need to hack the model for accessibility tools! With a culture of open source designs, Instructables, wikis, and blogs, we can start an international movement."
+*  "Open Source Disability Gadgets: DIY for PWD" [http://panelpicker.sxsw.com/ideas/view/1745] "Gear and software for people with disabilities is usually provided through charity or from medical supply companies. It's hard or impossible to repair it, or get anyone to repair it. We need to hack the model for accessibility tools! With a culture of open source designs, Instructables, wikis, and blogs, we can start an international movement." [[Projects#Open Source Disability Gadgets]]
 * Maybe we should have a page on "bus termination". The "1/10 speed of light" rule of thumb; theoretical optimum "impedance matching" parallel end termination resistor; the advantages of (series) source termination over end termination (lower power, less EMI); Schottky diode termination clamps (lower power; protects against ESD). Also other things people put at the end of long cables -- stuff to deal with accidental electrostatic discharge (ESD); various ways to bias differential pairs so that "cable unplugged" doesn't cause lots of unwanted noise glitches; various ways of connecting the shield of shielded cables at one end or the other end or both; galvanic isolation -- MIDI-like opto-isolation; Ethernet-like transformer isolation -- etc. Perhaps a brief summary of the best answers from [http://electronics.stackexchange.com/questions/tagged/termination questions tagged "termination"] and [http://electronics.stackexchange.com/questions/tagged/signal-integrity questions tagged "signal-integrity"] would be good?
@@ Line 194: / Line 194: @@
 Currently rapid prototyping consists of getting a few boards and chips, doing some soldering, finding the right libraries for communication, and then writing some programs.  I'd like to see an open design for snap together components which includes the case.  Imaging a Lego blocks each of which contains a micro-controller, sensor, radio, battery, or ...  You just snap them together and communication uses a standard library.  A small ASIC in each block provides the networking layer and translation to the appropriate protocol for the on board chips.  Currently I'm thinking a 4 wire connector with, +3.3V, GND, Clock, and Data would be the way to go.  It could use standard modular phone connectors to make the connection since they are cheap.  Something like this would open up the rapid prototyping world to anyone with programming skills for the micro-controllers.  A good set of building blocks and a GUI on the dev kit could open up the design even farther.  It should also drop the price of eval boards, since they should then consist of a single block.
 == How you can help ==

@@ Line 120: / Line 120: @@
 * Many ham radio operators make all their equipment run on 12 V and a red/black Anderson Powerpole connector. [http://en.wikipedia.org/wiki/DC_connector#Anderson_Powerpole_connectors Wikipedia: DC connector#Anderson Powerpole connectors]
 * Dale Davis makes all his equipment run off 12 V, and uses a standard cable everywhere with identical barrel power plugs -- center positive, barrel ground -- at both ends. [[Barrel Power Jack]]. The outer barrel is ground so that if a one end of the cord is plugged into 12 V power supply and the other end touches a metal case (which is always grounded), it's harmless. A nice feature of barrel plugs is that you can plug them in at any angle, and it Just Works.
 * The [http://greenplug.us/ Green Plug] universal power adapter
 * [http://www.myaups.org/ The Alliance for Universal Power Supplies]
@@ Line 135: / Line 137: @@
 points out some non-obvious features that are nice to have in a power connector,
 and makes some recommendations on which to use and which to avoid.
 Is it possible for the device to "negotiate" for exactly the voltage it needs, such that the same power adapter provides different voltages to different devices?
@@ Line 140: / Line 144: @@
 * Perhaps the device could include a resistor+resistor voltage divider or resistor+zener voltage divider to produce a feedback voltage precisely 1.25 V lower than the voltage it desires, so a LM317 or equivalent regulator will produce exactly the desire voltage?
 * ... in such a way that the power adapter automatically produces 0 V or "disconnected" soon after any device is unplugged. (hmm.. that would not be the case using the LM317...)
-* What do we need to ahead of time to design things so they don't overheat, posing a safety risk? (Rather than, say, finding out problems after they are in the field, and issuing a recall).<ref>
+* What do we need to do, ahead of time, to design things so they don't overheat, posing a safety risk? (Rather than, say, finding out problems after they are in the field, and issuing a recall).<ref>
 [http://www.bbc.com/news/technology-28956813 "HP recalls more than six million power cords"]
 </ref>

← Older revision		Revision as of 16:15, 11 November 2015
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	== open design laptop ==		== open design laptop ==
		+	: ''main: [[PC#open laptop]]''

	* Open design laptop (you can replace the components). ''(see [http://communitywiki.org/odd/ComputerComponent/CustomNotebook computer component wiki: custom notebook])''		* Open design laptop (you can replace the components). ''(see [http://communitywiki.org/odd/ComputerComponent/CustomNotebook computer component wiki: custom notebook])''

@@ Line 139: / Line 139: @@
 * Perhaps the device could include a resistor+resistor voltage divider or resistor+zener voltage divider to produce a feedback voltage precisely 1.25 V lower than the voltage it desires, so a LM317 or equivalent regulator will produce exactly the desire voltage?
 * ... in such a way that the power adapter automatically produces 0 V or "disconnected" soon after any device is unplugged. (hmm.. that would not be the case using the LM317...)
 * ... ?
 == micro controller based voip client ==

@@ Line 7: / Line 7: @@
 * Open power connector for [[mobile phone]]s, [[PDA]]s and laptops. ''(Wikipedia lists [http://en.wikipedia.org/wiki/DC_plug a variety of connectors] -- or were you looking for an AC [http://en.wikipedia.org/wiki/Power_connector power connector]? What sort of specification do you want?)''
 *  "Open Source Disability Gadgets: DIY for PWD" [http://panelpicker.sxsw.com/ideas/view/1745] "Gear and software for people with disabilities is usually provided through charity or from medical supply companies. It's hard or impossible to repair it, or get anyone to repair it. We need to hack the model for accessibility tools! With a culture of open source designs, Instructables, wikis, and blogs, we can start an international movement."
 == open design laptop ==

@@ Line 1: / Line 1: @@
-Ideas before they become OC projects:
+Got an idea about electronics development?
 * [http://visualthinkingart.blogspot.com/2006/01/portable-context-device.html Portable Context Device]
@@ Line 183: / Line 186: @@
 Currently rapid prototyping consists of getting a few boards and chips, doing some soldering, finding the right libraries for communication, and then writing some programs.  I'd like to see an open design for snap together components which includes the case.  Imaging a Lego blocks each of which contains a micro-controller, sensor, radio, battery, or ...  You just snap them together and communication uses a standard library.  A small ASIC in each block provides the networking layer and translation to the appropriate protocol for the on board chips.  Currently I'm thinking a 4 wire connector with, +3.3V, GND, Clock, and Data would be the way to go.  It could use standard modular phone connectors to make the connection since they are cheap.  Something like this would open up the rapid prototyping world to anyone with programming skills for the micro-controllers.  A good set of building blocks and a GUI on the dev kit could open up the design even farther.  It should also drop the price of eval boards, since they should then consist of a single block.
 [[Category:Ideas]]
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← Older revision		Revision as of 11:45, 16 October 2011
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	* Open data cable. Random good ideas: "One under-appreciated attribute is that the moving parts of the connector are on the cable side, not the system side; when the connector begins to show some wear and tear, the cable is thrown away, not the PC (or printer, or disk drive, or camera)." -- Michael Teener [http://www.commsdesign.com/main/multsupp/0002/0002fire.htm] ... Many popular data cables also include power (Power over Ethernet, FireWire -- but not the iLink variant, USB)... What voltage? extra-low voltage [http://en.wikipedia.org/wiki/Extra-low_voltage]? ... Is it better to have the same connector on both ends of the cable, or have different connectors? Same connector allows peer-to-peer arbitrary mesh; different connectors afford/suggest a tree topology ... putting 2 connectors on every device, "upstream" and "downstream", allows linear daisy-chaining; 3 identical connectors allow any arbitrary-dimensional topology ... the round pins vs. flat blades (vs. other connector shapes) controversy[http://en.wikipedia.org/wiki/Talk:Domestic_AC_power_plugs_and_sockets#round_pins_vs_flat_blades] ... optical isolation (like MIDI hardware) seems like a good idea ...		* Open data cable. Random good ideas: "One under-appreciated attribute is that the moving parts of the connector are on the cable side, not the system side; when the connector begins to show some wear and tear, the cable is thrown away, not the PC (or printer, or disk drive, or camera)." -- Michael Teener [http://www.commsdesign.com/main/multsupp/0002/0002fire.htm] ... Many popular data cables also include power (Power over Ethernet, FireWire -- but not the iLink variant, USB)... What voltage? extra-low voltage [http://en.wikipedia.org/wiki/Extra-low_voltage]? ... Is it better to have the same connector on both ends of the cable, or have different connectors? Same connector allows peer-to-peer arbitrary mesh; different connectors afford/suggest a tree topology ... putting 2 connectors on every device, "upstream" and "downstream", allows linear daisy-chaining; 3 identical connectors allow any arbitrary-dimensional topology ... the round pins vs. flat blades (vs. other connector shapes) controversy[http://en.wikipedia.org/wiki/Talk:Domestic_AC_power_plugs_and_sockets#round_pins_vs_flat_blades] ... optical isolation (like MIDI hardware) seems like a good idea ...

−	* When someone trips over the cable, destruction of the fixed socket is unacceptable -- but is it better to destroy the cable, or to let the cable pop out -- like [http://en.wikipedia.org/wiki/MagSafe MagSafe]? ... twisted pair for power, and twisted pair for data ... Some data line codes (such as the one used for USB) are designed to work even when the twisted pair is accidentally twisted an extra half-twist; is it worth arranging things so the entire plug can be plugged in with an extra half-twist with no problems (like automobile keys) ? ... What's this I hear about non-contact power pads?	+	* When someone trips over the cable, destruction of the fixed socket is unacceptable -- but is it better to destroy the cable, or to let the cable pop out -- like [http://en.wikipedia.org/wiki/MagSafe MagSafe]? ... twisted pair for power, and twisted pair for data ... Some data line codes (such as the one used for USB) are designed to work even when the twisted pair is accidentally twisted an extra half-twist; is it worth arranging things so the entire plug can be plugged in with an extra half-twist with no problems (like automobile keys and MagSafe) ? ... What's this I hear about non-contact power pads?

@@ Line 173: / Line 173: @@
 * Interface which can be used with Laptops or Desktops
-There is a distinct lack of audio interfaces compatible with Linux, most manufacturers of interfaces do not support Linux, the ones which do are usually on the higher end of price scale and changes to hardware architecture often breaks compatibility with the reversed engineers drivers made bythe community.
+There is a distinct lack of audio interfaces compatible with Linux, most manufacturers of interfaces do not support Linux, the ones which do are usually on the higher end of price scale and changes to hardware architecture often breaks compatibility with the reversed engineered drivers made by the community.
 Something affordable with say 8 or 10 in and outs which can record @ 24 bits @ 44.1/48/88.2/96 kHz would be very popular with Linux Audio enthusiasts.
-I'm not a technical expert and don't mention USB interface as understand that this is less capable at handling the higher sampling rates.  Some commercial manufacturers do make USB interfaces that can record at 24 bits but do this using propriety drivers, if this is possible a USB based interface would be more accessible and open more possibilities !
+I'm not a technical expert and don't mention USB interface as understand that this is less capable at handling the higher sampling / bit rates.  Some commercial manufacturers do make USB interfaces that can record at 24 bits but do this using propriety drivers, if this is possible a USB based interface would be more accessible and open more possibilities !
 [[Category:Ideas]]
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   - Basic Stamp?
   - 68HC11/12?
 [[Category:Ideas]]
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