Infra Red Monitor

APPLICATION OPERATION
The application of IR monitor is to check an IR
emitting device such as a TV Video remote controller.
This IR monitor requires only 7 resistors, 4 LED s, 1
miniature switch, 1 IR photo transistor and 1
PIC12C671 uC.
This circuit uses an analog converter from PIC12C671

to measure the infra-red intensity from the IR photo transistor.

The intensity is displayed on the bargraph
LEDs.
OPERATION
1. Put an emitting device in front of the IR monitor
(from 1 inch to 2 feet).
2. Press the switch on the IR monitor once to
wake-up the micro-controller.
3. Press one key on the TV video controller and
watch the 4 monitor LEDs. The LEDs blink if
data is received, if all 4 LEDs stay off, no IR is
sensing. If high IR power is received, more
LEDs will be on. If IR monitor didn't receive anything
for 17 seconds, it will turn off (sleep mode).
Note: The OPTIC IR photo-transistor must be protected
from daylight source to avoid false bargraph level.