as a "squad engineer" of our airsoft team, I have been asked to create a device that will help us with our "capture the hill" tournaments.
As I mostly work with software, I have an hard time picking the right sensor to use. My first idea would be to build something similar to a trail camera, used by hunters to study the preys trails. In order to do so, I thought about getting a PIR sensor and link it to an Arduino Micro I have in my drawer from another project. Then, I could use a spare team radio to transmit alarm codes (morse tones).
My sensor specifications are the following:
- outdoor operation capable
- ~10m range
- ~60° angle
- at least 24h operation on battery (sharing the Arduino power supply)
- false positives resistant
Is PIR the right technology to pick in this case ? If so, I really need to know if there are some sensors with the aforementioned specifications; all the Arduino DIY projects I have seen so far employ short range sensors. I would prefer something already packaged (fresnel + diode) from an european dealer.
In the following picture, you can see what I thought.
I have evaluated those other solutions also:
- steel/nylon tripwire: I would prefer the device to stay undetected as long as possible (it is not a claymore mine, but a silent alarm)
- hacking an airsoft claymore mine (small PIR range, remote unit useless)
- laser tripwire: the reflector (or external laser) unit adds usage complexity, detection is only linear
- doppler radar: my understanding is that this kind of device is only good for linear detection of movement to/from the unit. I could be wrong, though.