Digital Output Primer - Revision history

Mparadis: /* Using a 3052 SSR Board with a Digital Output */

2013-01-17T19:21:08Z

Using a 3052 SSR Board with a Digital Output

← Older revision		Revision as of 19:21, 17 January 2013
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	Setting the digital output to true causes the output of the 3052 to turn on.		Setting the digital output to true causes the output of the 3052 to turn on.
	This can be used to control AC or DC devices.		This can be used to control AC or DC devices. The 3053 and 3054 relay boards can be connected in the same way.

	The load can also be switched with the 3052 on the high side.		The load can also be switched with the 3052 on the high side.
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	===Isolating a Digital Output with a MOSFET based SSR===		===Isolating a Digital Output with a MOSFET based SSR===

Mparadis: /* 5 Volt Terminal Block */

2012-12-12T21:38:55Z

5 Volt Terminal Block

← Older revision		Revision as of 21:38, 12 December 2012
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	===5 Volt Terminal Block===		===5 Volt Terminal Block===
	For users who need it, we provide 5V on the terminal block next to Digital Output 7.		For users who need it, we provide 5V on the terminal block next to Digital Output 7 on most InterfaceKit boards.

	==Using the Digital Outputs==		==Using the Digital Outputs==

Mparadis: /* Using the Digital Outputs */

2012-08-08T18:01:22Z

Using the Digital Outputs

← Older revision		Revision as of 18:01, 8 August 2012
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	The 3051 is a good option if you need a couple relays in your project.		The 3051 is a good option if you need a couple relays in your project.
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			===Remembering Output States Through Reboot===

			When your computer reboots, the interface kit object will disconnect in software, which will cause you to lose your output states, even if the interface kit is connected to a powered USB hub. If you need to remember the output states, you could program your application to save the states to a file when a disconnect event occurs, and load the states when it connects again.

Mparadis: /* Using the Digital Outputs */

2012-07-27T21:05:54Z

Using the Digital Outputs

Mparadis: /* Update Rate */

2012-07-27T21:04:58Z

Update Rate

← Older revision		Revision as of 21:04, 27 July 2012
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	The 3051 is a good option if you need a couple relays in your project.		The 3051 is a good option if you need a couple relays in your project.
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	~~==Update Rate==~~

	Please check the specification for the maximum rate of sampling that the Digital input can measure. This is often slower than your program can change it. So, if you change the output one way and then flip it back immediately in your code, the interface kit may not register the change.

Mparadis: /* Specifications and Features */

2012-07-27T21:04:00Z

Specifications and Features

← Older revision		Revision as of 21:04, 27 July 2012
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	==Specifications and Features==		==Specifications and Features==

	[[Image:digital_output.jpg\|right\|thumb\|A Phidgets digital output.]]		[[Image:digital_output.jpg\|right\|thumb\|300px\|link=\|A Phidgets digital output.]]

	The 250 ohm resistance is internal to the PhidgetInterfaceKit 8/8/8, and limits the current that can flow through the output.		The 250 ohm resistance is internal to the PhidgetInterfaceKit 8/8/8, and limits the current that can flow through the output.

Cora at 21:33, 29 June 2012

2012-06-29T21:33:47Z

← Older revision		Revision as of 21:33, 29 June 2012
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	[[Category: Primer]]		[[Category: Primer]]
			{{HiddenNeeds\|This should eventually include open collector digital outputs, and their differences}}
	==Introduction==		==Introduction==

Cora at 15:27, 29 June 2012

2012-06-29T15:27:28Z

← Older revision		Revision as of 15:27, 29 June 2012
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	[[Category: Primer]]		[[Category: Primer]]

			==Introduction==

	Digital Outputs can be used to drive LEDs, solid state relays, and transistors (or anything that will accept a CMOS signal).		Digital Outputs can be used to drive LEDs, solid state relays, and transistors (or anything that will accept a CMOS signal).
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	==~~Known Issues~~==		==Update Rate==

	~~{{KnownIssues\|We need to tell users to pay attention to~~ the ~~update~~ rate of ~~their interface kit~~. ~~If their~~ program ~~changes~~ the ~~state of a digital~~ output ~~twice without some kind of delay or other time-consuming instruction~~ in ~~between~~, the interface kit may not register the change.}}		Please check the specification for the maximum rate of sampling that the Digital input can measure. This is often slower than your program can change it. So, if you change the output one way and then flip it back immediately in your code, the interface kit may not register the change.

Burley: /* Specifications and Features */

2012-06-20T20:40:19Z

Specifications and Features

← Older revision		Revision as of 20:40, 20 June 2012
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	The 250 ohm resistance is internal to the PhidgetInterfaceKit 8/8/8, and limits the current that can flow through the output.		The 250 ohm resistance is internal to the PhidgetInterfaceKit 8/8/8, and limits the current that can flow through the output.
	This is intended to protect the device from being damaged if there is a short to ground or if an LED is used.		This is intended to protect the device from being damaged if there is a short to ground or if an LED is used.
			Ultimately this means the maximum current output of the digital outputs is 16mA. In practice you should not try to draw 16mA from the outputs for extended periods of time though as this can lead to damaged components. You should try to limit your current draw to less than 5mA though up to 10 would not cause any immediate concerns.
	The output is intended to drive TTL or CMOS inputs; it is not designed to provide power to an external circuit.		The output is intended to drive TTL or CMOS inputs; it is not designed to provide power to an external circuit.

Burley: /* Specifications and Features */

2012-03-08T20:18:07Z

Specifications and Features

← Older revision		Revision as of 20:18, 8 March 2012
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	This is intended to protect the device from being damaged if there is a short to ground or if an LED is used.		This is intended to protect the device from being damaged if there is a short to ground or if an LED is used.
	The output is intended to drive TTL or CMOS inputs; it is not designed to provide power to an external circuit.		The output is intended to drive TTL or CMOS inputs; it is not designed to provide power to an external circuit.

			In practice the frequency at which these outputs can be switched is highly dependent on system properties such as OS, USB hardware, and cabling. However, it is a good bet that the majority of systems will be able to achieve 1kHz.

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	===5 Volt Terminal Block===		===5 Volt Terminal Block===
	For users who need it, we provide 5V on the terminal block next to Digital Output 7.		For users who need it, we provide 5V on the terminal block next to Digital Output 7.

	==Using the Digital Outputs==		==Using the Digital Outputs==

← Older revision		Revision as of 21:05, 27 July 2012
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	===Driving an LED with the Digital Output===		===Driving an LED with the Digital Output===

	[[Image:LED_digital_output.jpg\|right\|thumb\|Schematic for connecting to an LED.]]		[[Image:LED_digital_output.jpg\|link=\|300px\|right\|thumb\|Schematic for connecting to an LED.]]

	Connecting an LED to a digital output is simple. Wire the anode to a digital output labeled 0 to 7 on the Interface Kit, and the cathode to a supplied ground, labeled G.		Connecting an LED to a digital output is simple. Wire the anode to a digital output labeled 0 to 7 on the Interface Kit, and the cathode to a supplied ground, labeled G.
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	===Using a 3052 SSR Board with a Digital Output===		===Using a 3052 SSR Board with a Digital Output===

	[[Image:3052_digital_output.jpg\|right\|thumb\|Schematic for connecting a 3052 board.]]		[[Image:3052_digital_output.jpg\|right\|link=\|300px\|thumb\|Schematic for connecting a 3052 board.]]

	Setting the digital output to true causes the output of the 3052 to turn on.		Setting the digital output to true causes the output of the 3052 to turn on.
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	===Isolating a Digital Output with a MOSFET based SSR===		===Isolating a Digital Output with a MOSFET based SSR===

	[[Image:isolating_digital_output_ssr.jpg\|right\|thumb\|Schematic for isolating a digital input with an SSR.]]		[[Image:isolating_digital_output_ssr.jpg\|link=\|300px\|right\|thumb\|Schematic for isolating a digital input with an SSR.]]

	It’s possible to wire up your own Solid State Relay to the digital output.		It’s possible to wire up your own Solid State Relay to the digital output.
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	===Isolating a Digital Output with an Optocoupler===		===Isolating a Digital Output with an Optocoupler===

	[[Image:isolating_digital_output_optocoupler.jpg\|right\|thumb\|Schematic for isolating a digital input with an optocoupler.]]		[[Image:isolating_digital_output_optocoupler.jpg\|link=\|300px\|right\|thumb\|Schematic for isolating a digital input with an optocoupler.]]

	In some applications, particularly where there is a lot of electrical noise (automotive), or where you want maximum protection of the circuitry (interactive installations, kiosks), electrical isolation buys you a huge margin of protection.		In some applications, particularly where there is a lot of electrical noise (automotive), or where you want maximum protection of the circuitry (interactive installations, kiosks), electrical isolation buys you a huge margin of protection.
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	===Controlling a Relay with a N-Channel MOSFET===		===Controlling a Relay with a N-Channel MOSFET===

	[[Image:relay_nmos.jpg\|right\|thumb\|Schematic for using a relay with an NMOS transistor.]]		[[Image:relay_nmos.jpg\|right\|thumb\|link=\|300px\|Schematic for using a relay with an NMOS transistor.]]

	A inexpensive mosfet and flyback diode can be used to control larger loads - relays for example - directly from the digital output.		A inexpensive mosfet and flyback diode can be used to control larger loads - relays for example - directly from the digital output.
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	===Controlling a Relay with a NPN Transistor===		===Controlling a Relay with a NPN Transistor===

	[[Image:relay_npn.jpg\|right\|thumb\|Schematic for using a relay with an NPN transistor.]]		[[Image:relay_npn.jpg\|right\|thumb\|link=\|300px\|Schematic for using a relay with an NPN transistor.]]

	This circuit is very similar to the N-channel mosfet - but you may already have NPN transistors on hand.		This circuit is very similar to the N-channel mosfet - but you may already have NPN transistors on hand.
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	===Using a 3051 Dual Relay Board with one or two Digital Outputs===		===Using a 3051 Dual Relay Board with one or two Digital Outputs===

	[[Image:3051_digital_outputs.jpg\|right\|thumb\|Schematic for using a 3051 board.]]		[[Image:3051_digital_outputs.jpg\|right\|link=\|300px\|thumb\|Schematic for using a 3051 board.]]

	The 3051 Dual Relay Board is designed to be used with the PhidgetInterfaceKit 8/8/8.		The 3051 Dual Relay Board is designed to be used with the PhidgetInterfaceKit 8/8/8.