Posted in OpenSprinkler, Sprinkler Projects on Aug 30th, 2026
Four ways to drive 24VAC sprinkler solenoids from USB-C, with theory, circuit designs, oscilloscope measurements, and practical tradeoffs.
Posted in ESP32, MakeBusiness, OpenSprinkler, Sprinkler Projects on Aug 19th, 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, more memory and flash space, WiFi 6, analog inputs, […]
Posted in Apps, OpenSprinkler, Sensors, Sprinkler Projects on Aug 3rd, 2026
Some projects take a weekend. Some take a summer. And some take… a little over five years. Today I’m thrilled to make two announcements at once: OpenSprinkler Firmware 2.2.1(5) is officially available, and the Sensor Expander — after a month of pre-orders — is officially shipping. As detailed in our previous New Product Alert post, […]
Posted in IoT, OpenSprinkler on Jun 20th, 2026
A long-requested feature for OpenSprinkler is the ability to read analog sensors, including temperature, soil moisture, water level, light, and more. While OpenSprinkler’s built-in sensor ports can read binary (i.e., HIGH or LOW) signals—primarily from dry-contact switches like rain and flow sensors—it has lacked the ability to read analog sensors that produce continuous voltage signals. […]
Posted in IoT, OpenSprinkler on Feb 2nd, 2026
A common question we receive from users is: “How do I use OpenSprinkler to switch a water pump, a heater, a fan, or similar mains-powered devices?” Here are the top 5 ways to bridge the gap between OpenSprinkler and your high-voltage equipment, ranging from “Zero Wiring” to “Zero Software Configuration“. 1. WiFi Smart Plugs This […]
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