Through Hole IR Sensor Interfacing

[ZaeemAhmad]

Opto-Switch Interfacing

Hello,
I am basically trying to interface a through-hole IR opto-switch sensor (**broken link removed**) with Atmel 89S51 uC for counting purposes (i.e. I intend it to generate clock pulses when something opaque passes through its slit). I want to connect it to Timer 0 of uC.

1. What circuit should I use to bias the sensor and what components should I place between sensor output and timer 0 input pin?
2. Should I make P3.4 (T0 Pin) high during programming (as it is input), as it will receive external clock signals?
3. Can I output from Port 3 simultaneously while inputting clock signal at Timer 0 (P3.4)?

Thanks!

 

[ZaeemAhmad]

Problem solved!
1. Connect 555 Timer (or some Schmitt Trigger device, though I haven't tested the Schmitt Trigger solution) at the output of the slit-hole IR sensor. The circuit diagram can be found **broken link removed**.
2. Make P3.4 high, for safe-side.
3. Yes you can! Make sure you make it an input pin.