--- title: "Hacking A Reverse Osmosis Water Filter Through Its Smart Faucet" url: https://daily.dev/posts/hacking-a-reverse-osmosis-water-filter-through-its-smart-faucet-ipy1umx9i source_url: https://hackaday.com/2026/06/30/hacking-a-reverse-osmosis-water-filter-through-its-smart-faucet type: article source: "Hackaday" published: 2026-06-30T11:17:42.068Z updated: 2026-06-30T11:17:58.232Z tags: ["reverse-engineering"] reading_time: 2 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hacking A Reverse Osmosis Water Filter Through Its Smart Faucet **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A hardware hacker reverse-engineered the proprietary serial protocol used by the Waterdrop G3P600 smart RO water filter faucet. The four-pin connector turned out to carry a simple 9600 baud serial link at 5V, transmitting data on filter health, water quality, pump status, air temperature, and faucet state. Using this knowledge, a custom PCB was built to integrate the system with Home Assistant via ESPHome, enabling full home automation control and monitoring of the RO unit. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Dealing With Intermittent Water Utilities](https://daily.dev/posts/dealing-with-intermittent-water-utilities-hoeqazcdg) · Hackaday · 0 upvotes · 0 comments - [Snooping Flume Water Monitor Data On The Wire](https://daily.dev/posts/snooping-flume-water-monitor-data-on-the-wire-c5ym7kgqo) · Hackaday · 0 upvotes · 0 comments --- Tags: [#reverse-engineering](https://daily.dev/tags/reverse-engineering) [View this post on daily.dev](https://daily.dev/posts/hacking-a-reverse-osmosis-water-filter-through-its-smart-faucet-ipy1umx9i)