The following circuit is an infrared barrier, designed to apply to a central alarm, had several versions, this is 2.0 which differs from the 1.0 per carry greater distance.
Version 1.0 was almost the same as this but instead of having a driver based on the ULN2003 transistor array, only had a 2N3904 transistor and 4 IR LEDs. 1.0 In the receiver
was equal to this but instead of having an infrared module three terminals, had only one photo transistor and a filter.
This new version 2.0 works just like 1.0 but to have 14 infrared emitters and a receiver three-terminal semi amplified, we can achieve greater range, of course we can also add a lens on the receiver and much larger.
Performance, is based on two integrated firm HT12D Holtek HT12E and already used in several projects of this blog. These two integrated
are 8bit and 4bit data encryption, both the encoder to the decoder.
in the circuit is not used all 4 channels but could be a new version of the circuit using these channels to create different areas to interconnect all sensors and each other.
The circuit is as follows:
0 comments:
Post a Comment