![]() During pausing, zones and programs will stop until the pause timer counts down to 0. Support for pausing stations: you can pause station runs for a specified amount of time. For example, you can set a program to run from May 15 to Sep 15 only, or from Nov 10 to Feb 20 the following year. Support for setting a date range for each program: each program can specify start and end dates. Any zone in the parallel group can run simultaneously with any other zones. Zones in the same sequential group are automatically serialized, while zones in different groups can run simultaneously. Support for Sequential Groups: this generalizes and replaces the previous per-zone sequential attribute. For All of OpenSprinkler 2.3, 3.x and OpenSprinkler Pi (and Linux-based systems) Over the air (OTA) firmware update is now supported under either WiFi or wired Ethernet (previously it's only supported under WiFi). This unified the handling of WiFi and wired Ethernet. Updated ESP8266 core library to version 3.0.2: the adoption of ESP8266 WiFi Core 3.0.2 and lwip as wired Ethernet library. Support for OpenThings Cloud (OTC) connection: this allows remote access without the need of setting up port forwarding. Also, for this firmware (2.2.0) we've made a new video tutorial (the third video on the page). Before proceeding to update firmware, it's always a good idea to export your current configurations to a file so you can recover your programs and settings later. Update firmware from any previous version to this version will trigger a factory reset, including resetting Wifi settings. That’s it – if you need automatic rain delay control, this is an easy, inexpensive option you may consider.IMPORTANT REMINDER: this is a major firmware revision. If you want, you can even get a wireless version at a slightly higher cost. The sensor itself comes with a relatively long wire, so that shouldn’t be a problem. You need to run a wire from the sensor to your sprinkler timer. The sensor should be installed on the roof or next to the gutter. As is, it can work with almost any kind of sprinkler timer, without modifying the timer itself. When the sensor detects rain or freezing condition, it disconnects the common wire from the sprinkler valves. Simply put, the sensor acts as a normally-closed switch placed on the common wire. ![]() The diagram above shows the connection (Not sure where the ‘common wire’ is? Check out this diagram). Once you figure out how it works, it’s very easy to connect it to OpenSprinkler. The downside is that you cannot set the delay time precisely – obviously the local humidity and temperature will affect the evaporation speed. This is a very clever design because it’s purely mechanical, requires no power itself, and is easy to adjust. After the rain stops, the sponge pads will gradually shrink, and at some point the switch is released, thus the two wires are connected again. The size of the window controls how fast the absorbed water evaporates, thereby controlling the rain delay time. There are five options: 1/8, 1/4, 1/2, 3/4, and 1 inch.ĭown below the chamber is an evaporation window. The height of the chamber can be adjusted to control when the sensor is activated – in other words, the amount of rain that will activate the sensor. When it expands to a certain point, the switch inside the sensor will be pressed down, disconnecting the two wires. The pads will then expand and press against each other as well as the top of the chamber. When it rains, the water will drip into the chamber and gets absorbed by the sponge pads. The top of the sensor has a small chamber, which contains a string of sponge pads (see below). The sensor has two wires, which are normally connected to each other inside through a switch. So how does this rain sensor work? It’s pretty simple. The rain delay time can be easily adjusted by setting the water evaporation speed. ![]() It’s very easy to connect to OpenSprinkler, and works quite well. Recently I tried out this Orbit 57069 rain/freeze sensor. There are many types of rain sensors on the market. Rain/freeze sensors are useful for detecting rain or freeze conditions, and delays or stops watering accordingly.
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