دانلود فایل Optical Rat Trap Trigger
Optical Rat Trap Trigger
A simple circuit to make a better rat trap
This circuit can be used to trigger a trap when a rat or other animal interrupts a beam of infrared light. You can use this to build your own trap, or to modify an existing one. I used it to modify a wire cage type of live rat trap.
The advantages over a simple mechanical trigger are:
much less prone to false triggering from vibration or from animals climbing on the outside of the trap
less prone to non-triggering because the animal doesn’t have to press or move anything
live traps are less likely to injure the animal because it is less likely to false trigger when the animal is not all the way inside
provides an audible indication when the trap has been sprung
The disadvantages are:
requires batteries and uses them continuously when armed
Rats like to chew the wires.
This particular design has no protection from ambient light, so it will not work in daylight or unusually bright artificial light. This could be improved by modulating the IR and matching filtering at the receiving end, and by some optics to make the sensor more directional. But the goal here was to create a very simple solution that was adequate for the intended use. Even in the brightest room in my house, it works fine. It fails outside in daylight, but that’s not where I intend to use it.
I used a four pack of NiCd C cells which delivers about 4.8V and has about 1500mAH capacity. These keep the trap functional for more than a week on a single charge. NiMH AA cells would be smaller and have about 1/3 greater capacity, but I used the C cells because I already had them and their size is no problem for my trap. If you decide to use a power supply instead of batteries, I strongly recommend a fuse located away from the trap because rats like to chew the wires and cause shorts.
Place S1 such that the the main circuit is energized when the trap is set, and the buzze
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