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Wireless 3-Way
* App Name: Wireless 3-Way
* Author: chrisb
* Date: 2013-07-16
* This app "groups" a set of switches together so that if any one is turned on
* or off, they all will go on or off. This allows them to act as three-way
* without needing wiring between the switches.
* This program is Public Domain.
// This section is what the user will see and asks him or her to input the data we need.
preferences {
section("Turn on which switches or outlets?"){ // Whatever is in the quotes will be displayed to the user.
input "switches", "capability.switch", title: "Which?", multiple: true
// input means we're getting data from teh user. The first item "switches" is the nickname we're giving to this data.
// The second item "capability.switch" is asking what type of device we're looking for. We're looking for a device that
// can turn on and off. That can "switch."
// The third item, Title, is optional. This will display in the field that the user sees. You don't need to include this.
// Finally, we're indicating "multiple: true". This lets the user select multiple devices that fit the profile (ie, devices
// that can 'switch'). This is also optional. Obviously we need multiple devices for this program but if you don't for
// future programs, don't include this.
// This section tells the program what to do when it's first installed.
def installed()
subscribe(switches, "switch.on", switchOnHandler)
subscribe(switches, "", switchOffHandler)
// The first line here tells the program to associate "switches" (our nickname for the devices) we picked above with the procedure
// 'switchOnHandler.' That's just a name for the procedure we're do later. It also associates an action or event ("switch.on") with that
// procedure.
// As I'm sure you guessed the second line tells the program to associate any of our 'switches' and the event ("")
// with the switchOffHandler procedure.
// This section tells the program what to do if a user who has installed the program updates it.
def updated()
subscribe(switches, "switch.on", switchOnHandler)
subscribe(switches, "", switchOffHandler)
// The first line here unsubscribes to any action that the program previous subscribed too. It's a sort of "reset" of the program to
// clear out any old data. After this we re-subscribe to the same two things we did when the program was first installed.
// If this wasn't done we'd still be looking at old data and the program wouldn't operate right. For example, let's say the user installed
// this program for switch A and switch B. Later, he changed it to switch B and switch C. If we didn't unsubscribe, the program would still
// be looking at switch A and B for actions. If we didn't re-subscribe the program would never start look at switch C.
// This procedure tells the program what to do if it sees a switch turned on.
def switchOnHandler(evt) {
log.debug "I see a switch was turned on... I'm turning them all on!"
// def = definition. We're defining this procedure. The name of this procedure is the same as the what we told the program to
// run when it sees a switch turned on. The (evt) is saying: When you see this event happen (ie: "switch.on") do the actions in
// this procedure.
// The first line, log.debug "whatever" is for the simulator. It will display this line when the program comes to this point.
// These lines are very useful for long complex programs that aren't working right. They are a sort of sign that the app
// holds up to say: This is where I am in the program. These are optional. You do not need to put these in, but again, very
// useful for debugging programs.
// The final line is the real meat of the program. We are telling all the devices we selected in the preferences section above
// (nicknamed "swtiches") that they need to turn on. The the () at the end allows us to include some optional things.
// For example, let's say for some silly reason we want the rest of the lights to come on a few seconds after a switch is pressed.
// We can say: switch.on(delay: 3000) instead of just switch.on(). This will delay the command by 3000 milliseconds (or 3 seconds).
// Thie procedure tells the program what to do if it sees a switch turned off.
def switchOffHandler(evt) {
log.debug "I see a switch was turned off... I'm turning them all off!"
// Obviously this procedure is virtually identical to the previous. The only difference here is that instead of telling the switches
// to turn on (switches.on) we're telling them to turn off ( Again, remember that 'switches' is just the nickname we
// picked above. You can use pretty much any nickname you want. We could have called them daves instead of switches. Then the
// commands would be daves.on() or
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