https://rollupdb.com/tags/iot/ Recent content in IoT on RollupDB.com Hugo en-us Sun, 18 Oct 2026 00:00:00 +0000 https://rollupdb.com/keeping-years-of-cold-room-temperatures-on-an-iot-gateway-with-rollupdb/ Sun, 18 Oct 2026 00:00:00 +0000 https://rollupdb.com/keeping-years-of-cold-room-temperatures-on-an-iot-gateway-with-rollupdb/ <p>Picture a food distributor with six cold rooms, each with a sensor that reports the temperature every second. The readings go to a small gateway in the building. Somebody will want two things from that data. Today: is any room warming up? Two years from now, during an audit or an insurance claim: what were the temperatures in room 4 last March, and how bad did it get?</p> <p>Raw readings don&rsquo;t fit that brief. Six sensors at one reading a second come to about 190 million readings a year, and nobody wants to keep that on a gateway or ship it all to the cloud just to answer a question once a year. What the audit needs is the coldest, the warmest, the average and the spread for each room, hour by hour. That&rsquo;s what RollupDB keeps.</p>