Physical Computing at ITP | Tutorials / ULN 2004

February 16, 2007, at 01:27 AM by todd -

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

February 13, 2007, at 10:50 PM by todd -

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 Here are the parts you will need:

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Here are the parts you will need:

February 13, 2007, at 10:50 PM by todd -

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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:

February 13, 2007, at 10:49 PM by todd -

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ULN2004 Transistor array (available here)

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ULN2004 Transistor array (available here)

February 13, 2007, at 10:48 PM by todd -

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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 (available here)
one Board (eagle files)

January 31, 2007, at 04:04 PM by todd -

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January 31, 2007, at 12:27 PM by todd -

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January 31, 2007, at 12:19 PM by todd -

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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

ULN 2004

Tutorials.ULN2004 History