help with a toggled IR proximity sensor

urkidn · Jun 17, 2011

im a noob at eletronics but trying to make a "toggled" ir proximity sensor so i can turn on and off my lights in my room by waving my hand in front of my switch like 100-150mm i know how to make the ir senser,
i know how to make the relay switch my lights just im stuck on how to make a toggled switch by a pulse of voltage from the ir senser so it stays on all the time till i wave again to turn it off

please help me thank you

ericgibbs · Jun 17, 2011

urkidn said:
im a noob at eletronics but trying to make a "toggled" ir proximity sensor so i can turn on and off my lights in my room by waving my hand in front of my switch like 100-150mm i know how to make the ir senser,
i know how to make the relay switch my lights just im stuck on how to make a toggled switch by a pulse of voltage from the ir senser so it stays on all the time till i wave again to turn it off

please help me thank you

hi,
You need a latch, thats you can 'toggle'. How much space do you have in the switch housing.?
A CD4013 dual F/F will run from 3V thru 12V ok.

urkidn · Jun 17, 2011

i got heaps like 90mm in a wall cav

urkidn · Jun 17, 2011

thanks now all i need to know is how does it work

ericgibbs said:
hi,
You need a latch, thats you can 'toggle'. How much space do you have in the switch housing.?
A CD4013 dual F/F will run from 3V thru 12V ok.

ericgibbs · Jun 17, 2011

QUOTE=urkidn;983977]i got heaps like 90mm in a wall cav[/QUOTE]

hi,
If you post your IR sensor circuit, also showing it's power supply, we will show you how to add a latch.

urkidn · Jun 17, 2011

ir pic

ericgibbs said:
QUOTE=urkidn;983977]i got heaps like 90mm in a wall cav

hi,
If you post your IR sensor circuit, also showing it's power supply, we will show you how to add a latch.[/QUOTE]

ericgibbs · Jun 17, 2011

Ok , copied that.
Do you have a circuit for actually switching the light On/Off after the 'new' latch.? or is the circuit you posted all you have.??
I thought you had a working system that just required a latching/toggle part.?

urkidn · Jun 17, 2011

i was trying to find a way for that circuit to toggle something to drive my relay then the relay switches 240 volts

ericgibbs said:
Ok , copied that.
Do you have a circuit for actually switching the light On/Off after the 'new' latch.? or is the circuit you posted all you have.??
I thought you had a working system that just required a latching/toggle part.?

ericgibbs · Jun 17, 2011

hi,
OK, I will draw up a circuit.
After the photo detector you will require simple amplifier to sharpen up the signal to make suitable for clocking a F/F,, the F/F will drive a transistor which will in turn drive a 5Vdc coil relay
NOTE: the 5V relay must be suitable for switching the local 230Vac at the rated current current of the lamp.

urkidn · Jun 17, 2011

thank you so much for ur help, i was going to use the 5v relay to op. a 24v relay that can do 240v,10amps, thank you

ericgibbs said:
hi,
OK, I will draw up a circuit.
After the photo detector you will require simple amplifier to sharpen up the signal to make suitable for clocking a F/F,, the F/F will drive a transistor which will in turn drive a 5Vdc coil relay
NOTE: the 5V relay must be suitable for switching the local 230Vac at the rated current current of the lamp.

ericgibbs · Jun 17, 2011

urkidn said:
thank you so much for ur help, i was going to use the 5v relay to op. a 24v relay that can do 240v,10amps, thank you

hi,
I will post a circuit within the next 24 hrs.
Other members may also have a suitable circuit to post.

urkidn · Jun 17, 2011

would it work better if there was a op amp involved for a peak voltage from the ir sensor like 4v+ then ops the op amp then sends the pulse to the latch, i watched a few youtube vid on them and seem to act like a variable resister the closer u are the less resistance, u dont want it to toggle on the sliest pulse coz it will be controlling my room lights

ericgibbs · Jun 17, 2011

I would like you to the following test, using your IR emitter and detector.
Connect the components exactly the way shown in your posted image,
Power up the circuit, then using a voltmeter, measure the voltage across the detector.
Place your hand in front of the emitter/detector at distances of 100mm and 150mm and also without your hand in front.
So get the 3 readings

Post the 3 voltage readings and from that I can complete the circuit diagram.

urkidn · Jun 18, 2011

i need to go shoping for it to do them test but this is where i found it **broken link removed** down the bottom its got its detetion voltage at 5v if this is any help

ericgibbs said:
I would like you to the following test, using your IR emitter and detector.
Connect the components exactly the way shown in your posted image,
Power up the circuit, then using a voltmeter, measure the voltage across the detector.
Place your hand in front of the emitter/detector at distances of 100mm and 150mm and also without your hand in front.
So get the 3 readings

Post the 3 voltage readings and from that I can complete the circuit diagram.

urkidn · Jun 18, 2011

omg i just relised this wont work, the voltage dims at the output when the ir's reflected...i didnt see that i thought it did increased voltage at the output

ericgibbs said:
I would like you to the following test, using your IR emitter and detector.
Connect the components exactly the way shown in your posted image,
Power up the circuit, then using a voltmeter, measure the voltage across the detector.
Place your hand in front of the emitter/detector at distances of 100mm and 150mm and also without your hand in front.
So get the 3 readings

Post the 3 voltage readings and from that I can complete the circuit diagram.

urkidn · Jun 18, 2011

i found this today https://www.electro-tech-online.com/threads/pic-programming-using-basic.437/ would it mater if the pulse is 2.5 sec's long?

urkidn said:
omg i just relised this wont work, the voltage dims at the output when the ir's reflected...i didnt see that i thought it did increased voltage at the output

ericgibbs · Jun 18, 2011

IF you want me to post a circuit, post the voltages I requested.

urkidn · Jun 21, 2011

hey, sorry for late reply finally had time to make it and that, 5volts nothing in front of it. 4.5v with my hand in front of it

ericgibbs said:
IF you want me to post a circuit, post the voltages I requested.

ericgibbs · Jun 22, 2011

hi,
OK, I did a circuit assuming the detector levels, will redo with 5V 'no hand'.... 4.5V 'hand' and post it.

ericgibbs · Jun 22, 2011

hi,
Look at this circuit.
I have not put any IC pin numbers on, are you OK to do that yourself.?

Build the circuit on a bread board, WITHOUT the mains connections.
Note: the LM393 are CD4013 are both dual IC's, so any unused INPUTS should be connected to 0V.

On the 5V and 12V power lines, add a 100nF and 22uF thru 220uF decoupling capacitors.

Ask if you need explanation.

EDIT:
The plots show four passes of the hand over the detector.

help with a toggled IR proximity sensor

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