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Ray's DIY Electronics Hobby Projects

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OpenSprinkler Firmware 2.2.1(6) and the Official Release of AC-Powered OpenSprinkler v4 25 Sep 2026
About a month ago, we introduced AC-powered OpenSprinkler v4, the first OpenSprinkler built on ESP32, and opened pre-orders with shipments expected in late September. Today I’m happy to announce that OpenSprinkler v4 is officially shipping, and every unit comes with the newly…
Announcing ESPHome-Based Firmware for OpenGarage 12 Sep 2026
We’re excited to announce the first release of our ESPHome-based OpenGarage firmware! It brings native, local Home Assistant integration to OpenGarage—making it easier to control your garage door and monitor your vehicle alongside your other smart-home devices. This is an…
Ditch the Transformer: Four Ways to Drive Sprinkler Solenoids with USB-C 30 Aug 2026
Four ways to drive 24VAC sprinkler solenoids from USB-C, with theory, circuit designs, oscilloscope measurements, and practical tradeoffs.
Introducing AC-Powered OpenSprinkler v4.0: Powered by ESP32 19 Aug 2026
Exciting news! We’re getting ready to launch the next generation of OpenSprinkler: AC-Powered OpenSprinkler v4.0, the first built on ESP32. From the outside it looks just like v3.4 — same enclosure and same ports — but inside is an entirely new brain, with a faster processor,…