Facility manager at a hotel campus, pretty new to IoT. We are in the US, if that matters. We have 40 path lights between the buildings, a few waste bins and some planters. The owner saw a video about wireless electricity and asked me if we can put sensors on the posts (light status, bin fill, soil moisture) without digging up the paths to run cables.
I see there’s a Hermetry City section here. Is that what we’d use? And is wireless power a real option or did the owner see a demo that doesn’t scale? I don’t want to buy the wrong thing.
Following, our buildings want the same for the parking lot lights.
Wireless power works over centimetres (phone chargers). Over metres you get microwatts and terrible efficiency. Your owner saw a demo.
For the water network we use battery loggers that last years on a few readings a day. That is what “no wires” looks like in practice.
OK so batteries. Does Hermetry City handle that or do I need something else?
Do this kind of work for a council, so a few things.
Whatever Hermetry City adds, I found no doc page for it, so I can’t tell you. Everything you described works with ordinary devices, profiles, alarms and a dashboard.
Power: the path lights already have power at the top of the post. Lots of posts have a photocell socket, and sensor nodes made for those sockets take their power from it. That covers light status and anything mounted on the post. Bins and planters: battery sensors, reading a few times a day.
Radio: LoRaWAN suits bins and planters. The network server uses your gateway’s frequency plan, so in the US get a 915 MHz gateway and sensors on the same plan, see Regions and frequency plans. Where the hotel’s Wi-Fi reaches, Wi-Fi sensors are fine too. Battery Wi-Fi sensors should wake, send over HTTPS and sleep, give them a profile with the Recent message online rule.
Then a threshold rule on battery and a Device offline rule on each profile, so you hear about a dead sensor before a guest complains about the bin.
Put hysteresis on the battery rule, something like below 20 with a margin of 5. Cold mornings make batteries dip and you’ll get an alarm every dawn otherwise.
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