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ULN 2004

Tutorials.ULN2004 History

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The ULN2004 Transistor array is useful for driving unipolar stepper motors or your application requires multiple transistors.

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 Here are the parts you will need:
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Here are the parts you will need:
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ULN2004 transistor array
Here are the parts you will need:
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Here are the parts you will need:
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*ULN2004 Transistor array  ([[http://focus-webapps.ti.com/general/docs/sitesearch/searchdevice.tsp?partNumber=uln2004| available here]])
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*ULN2004 Transistor array  ([[http://focus.ti.com/docs/prod/folders/print/uln2004a.html| available here]])
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*ULN2004 Transistor array (Available here)
*one Board
(Gerber file) - Eagle files can be found here(LINK)
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*ULN2004 Transistor array  ([[http://focus-webapps.ti.com/general/docs/sitesearch/searchdevice.tsp?partNumber=uln2004| available here]])
*one Board ([[http://itp.nyu.edu/physcomp/images/tutorials/components/ULN2004eaglefiles.zip| eagle files]])
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ULN2004 transistor array
Here are the parts you will need:

*ULN2004 Transistor array (Available here)
*one Board (Gerber file) - Eagle files can be found here(LINK)
*one 16 pin socket






The ULN2004 transistor array contains seven npn transistors. There are seven inputs, seven corresponding outputs, ground and a power.

The outputs connect to the cathode (ground) of the component you are controlling.

To test the transistor array:
Connect a wire from your microcontroller to pin A1
Connect the cathode(ground) of an LED to pin B1
Connect the anode(power) of the led to power
Connect power and ground pins.

Your code should send a digital HIGH to pin A1 and the light will go on.

For the other pins, repeat the procedure for pins A2, B2, A3, B3 and so on.

Pin description:
*A1 to A7 - inputs from microcontroller
*B1 to B7 - outputs
*GND - connect to ground
*+V - connect to power




  Edit | View | History | Print | Recent Changes | Search Page last modified on February 16, 2007, at 01:27 AM