please help
i need to use this micro obstacle sensor output to mosfet for stair led
(5V 150mA smd 5050).
It work when met object output 0V otherwise 5v, i want reverse then met object =5v how to do?

http://www.ebay.com/itm/The-infrare...?pt=Automazione_domestica&hash=item4172255205

 

When you say "reverse", are your reversing a motor? If so, you will need a DPDT relay or an H-Bridge.

 

Mike
space at stair too small and led only 5v 150mA then i prefer to use a mosfet only,

 

I still do not understand "reverse". Can you post a block diagram of what you are attempting to do?

 

he means that ebay tool gives o/p of 0v when it senses something. otherwise the o/p rests @ 5v.

he wants o/p in reverse order. i.e. 0 under normal conditions, 5v when sensing stuff.

 

This sensor output feed to mosfet

standard infra red distance sensor "when met object = 0V otherwise 5v",
then i want "when met object =5v otherwise 0V".

sorry i dont understand how to post a pict.

 

You need an inverter (e.g. consisting of a single transistor plus a couple of resistors) between the sensor and the mosfet gate.

 

This sensor output feed to mosfet

standard infra red distance sensor "when met object = 0V otherwise 5v",
then i want "when met object =5v otherwise 0V".

sorry i dont understand how to post a pict.

To add pictures to your posts, see this blog entry.

 

This sensor output feed to mosfet

standard infra red distance sensor "when met object = 0V otherwise 5v",
then i want "when met object =5v otherwise 0V".

sorry i dont understand how to post a pict.

Try this circuit:

 

thank you mike