I'm trying to set up a IR proximity sensor and these are the only ones available in my area. I have no datasheets or circuit diagrams.
Both are leds: TIL38 as transmitter; TIL81 as receiver
How should I connect them to my basic stamp?
The first link on a search for "TIL38" goes to the datasheetarchive.com, which shows a Texas Instruments sheet with a few basic parameters of several devices. Here's info to use fror determining resistor values for connection :
I'm only familiar with IR receivers that are of the 3-pin type (+ve, -ve, sig).
I'm thinking of connecting the TIL38 in series with a resistor to a I/O, using the FREQOUT command. As for the TIL81, I'm unsure of the connection, +ve or -ve to the I/O?
It's finally working!!! The receiver must be connected in reverse-bias, just like what u described.
However, the detection is limited to about 1 cm, that is for proximity detection, without any resistot connected to the emitter. Connected to a 220 ohms resistor, the range is only about 2 mm.