Infared Emitter/Reciver for a noobie :/

[MaltiK]

In the infared emiitter/detector circuit, T1 is the for the LED? and L1, for for the reciever?




also the DIP LM358 has 8 pins, which, according to the schematic, do I connect, from where the + is to the VCC (pin and the - to the GND (pin 4), if so then the other 6 pins alone?

[mbateman]

L1 is the LED. T1 is the reciever transistor.

Here is the pinout for the LM358...  http://www.national.com/images/pf/LM358/00778702.pdf

Pins:
1 Vout
2 -
3 +
4 Gnd
5 not used for this circuit (could be second circuit +)
6 not used for this circuit (could be second circuit -)
7 not used for this circuit (could be second circuit Vout)
8 Vcc

[ArcMan]

BTW, the photo-transistor circuit does not need the op-amp if you are just going to wire it to a uC input.  Just tie the phototransistor emitter to ground and pull the collector up to Vcc with a 4.7K resistor (or there abouts), and then tie the collector to the uC input.  Viola!  Easy, and it works great.

[Admin]

The amplifier is only required if you are measuring really small signals. If you get great signals without the amplifier, you don't need to bother with it.