Lighting - Revision history

Lxpk at 02:44, 16 March 2022

2022-03-16T02:44:59Z

← Older revision		Revision as of 19:44, 15 March 2022
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	{{projects}}		{{projects}}
	[[Category:Projects]]		[[Category:Projects]]
	~~{{proposal}}~~
	{{big}}'''Lighting''' at Noisebridge is a system in need of upgrades to make the space more beautiful for events and welcoming for guests.		{{big}}'''Lighting''' at Noisebridge is a system in need of upgrades to make the space more beautiful for events and welcoming for guests.
	{{/big}}		{{/big}}
			{{proposal}}

	=Historic=		=Historic=

Lxpk at 02:42, 16 March 2022

2022-03-16T02:42:48Z

← Older revision		Revision as of 19:42, 15 March 2022
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			{{projects}}
	[[Category:Projects]]		[[Category:Projects]]
			{{proposal}}
			{{big}}'''Lighting''' at Noisebridge is a system in need of upgrades to make the space more beautiful for events and welcoming for guests.
			{{/big}}

			=Historic=
			==Lighting Project 2011==
	My intention is to replace the Noisebridge light switches with a computer controlled, triac, dimmable, and easily		My intention is to replace the Noisebridge light switches with a computer controlled, triac, dimmable, and easily
	hackable system.		hackable system.

	==General system requirements==		===General system requirements===

	* Damage the existing light switch panel as little as possible		* Damage the existing light switch panel as little as possible

Rubin110 at 05:39, 27 November 2011

2011-11-27T05:39:06Z

← Older revision		Revision as of 22:39, 26 November 2011
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	* Add a remote control, for example the firefly.		* Add a remote control, for example the firefly.
	* Send a retro-looking physical lightswitch to NYC Resistor or to other hackspaces and with instructions to give it network control over one of our lights. Hope they do the same.		* Send a retro-looking physical lightswitch to NYC Resistor or to other hackspaces and with instructions to give it network control over one of our lights. Hope they do the same.


			==Links==
			* http://www.denninger.net/homedaemon.htm

SpammerHellDontDelete at 05:01, 10 December 2008

2008-12-10T05:01:28Z

← Older revision		Revision as of 22:01, 9 December 2008
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			[[Category:Projects]]

	My intention is to replace the Noisebridge light switches with a computer controlled, triac, dimmable, and easily		My intention is to replace the Noisebridge light switches with a computer controlled, triac, dimmable, and easily
	hackable system.		hackable system.

Dstaff: /* Analog Theory of Operation */

2008-11-13T00:22:15Z

Analog Theory of Operation

← Older revision		Revision as of 17:22, 12 November 2008
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	=== Analog Theory of Operation===		=== Analog Theory of Operation===
	Here is a simplified diagram of the Analog and high voltage part of the system:		Here is a simplified diagram of the Analog and high voltage part of the system:
	[[Image:~~lighting_block~~.png]]		[[Image:lighting_block2.png]]

	The high current switching element in an AC dimmer is an optically coupled		The high current switching element in an AC dimmer is an optically coupled
	triac. These are commonly known as SSRs (Solid State Relays.) SSRs will turn		triac. These are commonly known as SSRs (Solid State Relays) SSRs will turn
	on when a voltage is applied across the control pins. Once an SSR is turned on,		on when a voltage is applied across the control pins. Once an SSR is turned on,
	it will not turn off until no current flows through it.		it will not turn off until no current flows through it.

	AC dimmer circuits exploit this fact by turning the SSR on in phase with the		AC dimmer circuits exploit this fact by turning the SSR on in phase with the
	AC waveform. For example, to run a light at 50% intensity, a ~~circuit pulses~~		AC waveform. For example, to run a light at 25% intensity, you'd use a control
	the SSR ~~about half way through each phase~~ of the ~~AC sine~~ wave.		voltage of 1.6 volts. The comparator would not turn the triac on until 75%
			of each sine wave. The comparator would automatically turn the SSR off at
			the end of the wave because the integrator would reset back to 4 volts. A
			voltage above 4.0 volts or below 0.8 volts hold the output always on or
			always off.

	See [[~~Lighintg~~ Analog Details]] for the full description of the analog circuitry.
	~~Status: Implemented and working~~. A ~~respin~~ of the ~~PCB to fix~~ a ~~routing error may be required~~.		See [[Lightintg Analog Details]] for the full description of the analog circuitry.

			The low pass filter on the input means that the lights can be controlled with
			a PWM circuit instead of an analog voltage. A PWM circuit controlling the
			lights should have a base freequency of between 2,000hz and 20,000hz for
			the best results. In the example above, you'd use a PWM circuit set at
			36% duty cycle. The input impedence is about 5K ohms.

	==Computer Control System==		==Computer Control System==

Dstaff: /* Analog Theory of Operation */

2008-11-13T00:03:56Z

Analog Theory of Operation

← Older revision		Revision as of 17:03, 12 November 2008
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	=== Analog Theory of Operation===		=== Analog Theory of Operation===
	Here is a simplified diagram of the Analog and high voltage part of the system:		Here is a simplified diagram of the Analog and high voltage part of the system:
	[[Image:lighting_block.~~jpg~~]]		[[Image:lighting_block.png]]


	The high current switching element in an AC dimmer is an optically coupled		The high current switching element in an AC dimmer is an optically coupled
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	See [[Lighintg Analog Details]] for the full description of the analog circuitry.		See [[Lighintg Analog Details]] for the full description of the analog circuitry.
	Status: Implemented and working. A respin of the PCB ~~two~~ fix a routing error may be required.		Status: Implemented and working. A respin of the PCB to fix a routing error may be required.

	==Computer Control System==		==Computer Control System==

SpammerHellDontDelete: /* AC Dimming System */

2008-11-13T00:02:03Z

AC Dimming System

← Older revision		Revision as of 17:02, 12 November 2008
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	of a catastrophic failure of the system, the power cable for a light can be manually connected to the power outlet.		of a catastrophic failure of the system, the power cable for a light can be manually connected to the power outlet.

	~~--- TODO: schematic~~ and ~~theory~~ of ~~operation~~		=== Analog Theory of Operation===
			Here is a simplified diagram of the Analog and high voltage part of the system:
			[[Image:lighting_block.jpg]]


	Status: Implemented and working. A respin of the PCB two fix a routing error may be required.		The high current switching element in an AC dimmer is an optically coupled
			triac. These are commonly known as SSRs (Solid State Relays.) SSRs will turn
			on when a voltage is applied across the control pins. Once an SSR is turned on,
			it will not turn off until no current flows through it.

			AC dimmer circuits exploit this fact by turning the SSR on in phase with the
			AC waveform. For example, to run a light at 50% intensity, a circuit pulses
			the SSR about half way through each phase of the AC sine wave.

			See [[Lighintg Analog Details]] for the full description of the analog circuitry.
			Status: Implemented and working. A respin of the PCB two fix a routing error may be required.

	==Computer Control System==		==Computer Control System==

Elgreengeeto: /* Ideas for expansion */

2008-11-12T18:45:40Z

Ideas for expansion

← Older revision		Revision as of 11:45, 12 November 2008
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	* Add outputs than run to other lights		* Add outputs than run to other lights
	* Add a remote control, for example the firefly.		* Add a remote control, for example the firefly.
			* Send a retro-looking physical lightswitch to NYC Resistor or to other hackspaces and with instructions to give it network control over one of our lights. Hope they do the same.

Dstaff at 01:03, 11 November 2008

2008-11-11T01:03:22Z

← Older revision		Revision as of 18:03, 10 November 2008
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	* Damage the existing light switch panel as little as possible		* Damage the existing light switch panel as little as possible
	* ~~4 10~~ amp outputs~~, expandable to 8~~		* 6 12 to 16 amp outputs
	* Touch screen UI at the front door		* Touch screen UI at the front door
	* Easy-to-access override switches for each circuit (force on and force off)		* Easy-to-access override switches for each circuit (force on and force off)
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	Status: ~~I've prototyped~~ and ~~successfully operator a single channel version~~ of the ~~ADCS~~.		Status: Implemented and working. A respin of the PCB two fix a routing error may be required.
	==Computer Control System==		==Computer Control System==

	The CCS is basically a computer with a DAC (digital to analog converter) circuit attached. The computer has a digital I/O board based around an 82c55 that will connect to a TLC7226IN four channel DAC. The outputs of the DAC are buffered and connect to the inputs of the ADCS unit. My intention is to use a Transmetta-based PC-104 board with a solid state disk and a		The CCS is basically a computer with a DAC (digital to analog converter) circuit attached. The computer has a digital I/O board based around an 82c55 that will connect to a TLC7226IN four channel DAC. The outputs of the DAC are buffered and connect to the inputs of the ADCS unit. My intention is to use a Transmetta-based PC-104 board with a solid state disk and a 82c55 daughter card.
	82c55 daughter card.

	The CCS has three interfaces: A web page, a touch screen LCD panel, and a CGI/xml interface.		The CCS has three interfaces: A web page, a touch screen LCD panel, and a CGI/xml interface.

	Status: ~~I have the computer~~ and ~~have successfully interface with the 82c55 card~~. ~~I don~~'t yet ~~have the DACs but I've~~		Status: The DAC interface is built and working. The four input channels arn't set up yet. I don't have an LCD panel yet.
	~~implemented projects like this before and~~ I don't ~~expect much trouble. I've not sourced or really thought about~~
	~~the touch screen~~ yet.

	~~IDEA: Maybe I can find a multichannel USB or RS232 DAC and save myself a lot of work~~.

	==Software Interface==		==Software Interface==
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	query and set the state of the lights. Something like:		query and set the state of the lights. Something like:

	http://lights/api/config?		http://lights/api/config.xml
	Fetches an XML document describing logical names and permissible values for the lights		Fetches an XML document describing logical names and permissible values for the lights

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	Returns an XML document with the current value for light XXXX		Returns an XML document with the current value for light XXXX

			http://lights/api/getinput?input=XXXX
			Returns an XML document with the status of the input line XXXX

			http://lights/api/status?
			Returns an XML document with the status of every input and output.

	On top of that, we want a pretty web UI.		On top of that, we want a pretty web UI.

Dstaff: /* General system requirements */

2008-11-11T00:54:53Z

General system requirements

← Older revision		Revision as of 17:54, 10 November 2008
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	I want to split parts of the system that handles the AC switching from the computer and network interface stuff. We'll		I want to split parts of the system that handles the AC switching from the computer and network interface stuff. We'll
	call the two parts the Computer Control System (CCS) and the Alternating Current Dimming System ACDS.		call the two parts the Computer Control System (CCS) and the Alternating Current Dimming System ACDS.
	[[Image:lighting_system.~~jpg~~]]		[[Image:lighting_system.png]]

	==AC Dimming System==		==AC Dimming System==