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Hardik
01-16-2005, 01:27 AM
I want to use two sensor boards.
Each board contais 7 IR sensors and some circuit.(consumes 104mA current)
But i want to use only one of the two boards at a time, which should be controllable through microcontroller.

How can this be implemented??
any IC which sources more than 100mA current?

I am using ULN2003 at 12v for my steppers.
can the extra pins be used for sensors?.....unregulated 12v is given to the IC....and is controlled by 5v regulated voltage...so is the output regulated or unregulated?...

Plz help me out guys...its urgent

ice
01-16-2005, 09:57 AM
.unregulated 12v is given to the IC....and is controlled by 5v regulated voltage...so is the output regulated or unregulated?...

5V is just control logic...
the output to the stepper will be unregulated



any IC which sources more than 100mA current?

ULN2003 or ULN2803
Both supply 500mA current...

..ice

a_iitian
01-16-2005, 11:19 AM
Each board contais 7 IR sensors and some circuit.(consumes 104mA current)
But i want to use only one of the two boards at a time, which should be controllable through microcontroller.
any IC which sources more than 100mA current?


u can use relay or u can also use a BJT for having current to be ]bib or u can also use darlington pair

ice
01-16-2005, 12:17 PM
u can use relay or u can also use a BJT for having current to be ]bib or u can also use darlington pair

..ULN2003 and ULN2803 are Darlingtons..so u may use 'em as a_iitian said

Hardik
01-17-2005, 12:45 AM
Thankyou for ur suggestions..ULN2003 would be gr8

But as said ULN2003 gives unregulated output... would it do for the sensor board ? can i use the remaining pins for sensors?

or should it be thisway?
a new ULN2003 IC .....with a 5v supply to it (instead of 12)

relay.....which one(what do i tell the shopkeeper)...r they pc mountable..ive seen only one which was big enough( to control 230v)...sorry guys im not an electronics guy to have sufficient knowledge

ice
01-17-2005, 07:22 AM
But as said ULN2003 gives unregulated output.
if u give regulated voltage to the chip,it will give out regulated voltage.

You can use ur ir emitters by directly connecting them to 5V through a resistor..the current will be enough.

Hardik
01-18-2005, 12:09 AM
Thankyou ICE

well right now the board is directly connected to 5v
why i wanted an on/off control on the 2 boards is b'coz ......it consumes a lot of current(100mA) unnecessarily even when not in use.

ill try using ULN2003 ...