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After sweeping, the robot vacuum just circles in place but can't find a charging station. In the morning, I found it under the coffee table when it was dead. Recharging doesn't rely on maps, but on infrared signals from charging piles. Blocked roads, electrode oxidation, and direct sunlight can all make it lose its home. Six reasons are listed probably, and most don't require repairs....

During the first week of the cold snap, my doorbell's battery dropped from 58% to 38%, and I almost ordered a new battery. Later, I found that at low temperatures, half of the lithium battery actually degrades, and the other half is apparent drops that rebound. The principle behind the phone's automatic shutdown outdoors in winter is the same. Using a button battery thermometer works fine. This article explains the principle and winter strategies in one detail....

My cousin's old DSM6.2 third-party package was installed, and the kit center rotated and the community source showed invalid locations. I checked the system time from NAS in-house and finally found the real culprit on the root certificate. The four root causes are listed in order, with the old machine stuck at the end. This article explains the diagnostic sequence and the judgment methods for each step....

After transferring 186GB files from the computer to the NAS, I ran through four routes: wireless, gigabit cable, 2.5G, and external hard drive transfer: wireless took two and a half hours before disconnecting, network cable took 29 minutes, and the fastest took 11 minutes. Includes the robocopy multithreaded command and a four-path mapping table....

During the days my wife took the child back to her parents' home, three fingerprint try-and-error alerts appeared in the door lock app log, but my phone didn't ring at all. After checking the door lock and reaching the notification bar, I finally understood: the lock was working fine, but what was stuck was Mijia's message switch and Android's power-saving strategy. The locations and troubleshooting sequence of the four switches are explained clearly in this article....

A colleague's black Synology bricked for the third time, and I used RR to guide and redo the system, which saved it. Will Black Synology still be available in 2026? Is the whitewashing code worth buying? How to choose between free and legal Feiniu? I've laid it down for him: What are the differences between all-black, semi-white, and fully whitewashed three-level features? These three types of people can keep experimenting, and more people will just install Feiniu for peace of mind....

How much does a whole-house smart system cost? I dug through every order item: entry-level at 500 yuan, comfort at 3,000 yuan, my two-year home-wide package just over 9,000 yuan, plus the three hidden main accounts—gateway tax, battery tax, and cloud deposit tax—all sorted out for you....

From renovation to buying network equipment, many people don't know how much budget to allow. I split the bill into two books: the monthly broadband fee and the one-time equipment fee. For equipment, I went from 0 yuan to 2,000 yuan in four transactions. My 89-square-meter unit was capped at 500 yuan, so I didn't waste a single cent....

My cousin asked me about the budget for installing surveillance cameras when moving into a new house, but this question can't be answered in one sentence. I went through the detailed accounts of the four tiers, from an old phone plan worth 300 yuan to a POE four-piece set for 3,000 yuan, covering the three most easily missed items: cloud storage, storage cards, and electricity bills....

An old phone used as a dashcam for a month: the car could reach 70 degrees under the sun, and lithium batteries were the only thing I dared not gamble; The main camera can't capture lane entry from the side at 80 degrees; Regular camera apps stop when full, so you need to switch to one that supports loop overwriting. How to cross the three hurdles, who just buys a legitimate dashcam, and the month's expenses are all counted here....