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hello Alex. thanks for remark, you are right. However my "ultimate" goal is to count people passing a back-country skiing track, so I decided to emphasise the h
by matell 12y ago
hello Alex. thanks for remark, you are right. However my "ultimate" goal is to count people passing a back-country skiing track, so I decided to emphasise the human-counting use case.
- danpat 12y agoI'd look seriously at the TRAFx counters I referred to in my other comment. They'll do exactly what you want, they're used to count backcountry skiers by quite a few organizations, they work great in winter down to at least -40C. There are some non-trivial design problems that need to be overcome in outdoor environments. The ultrasonic sensor may not be a good choice for winter counting, frost buildup on the sensor surface will likely greatly affect performance, plus it's a bit of a power hog. Don't forget that battery capacity/max current can be greatly affected by cold temperatures as well.