issue #3: make relay active state configurable

Author: rsporny

README.md

@@ -21,7 +21,8 @@ Sample accessory:
     "pinUp": 5,
     "pinDown": 11,
     "durationUp": 13000,
-    "durationDown": 13000
+    "durationDown": 13000,
+    "activeLow": false
   }
 ]
 ```
@@ -34,6 +35,7 @@ Fields:
 - `pinDown` pin for moving down
 - `durationUp` milliseconds to open blinds completely
 - `durationDown` milliseconds to close blinds completely
+- `activeLow` set to false if your relay is activated by high state (default: *true*)
 
 ## Raspberry Pi setup
 - Raspberry Pi 3 (should work with all versions)

config-sample.json

@@ -13,15 +13,17 @@
       "pinUp": 5,
       "pinDown": 11,
       "durationUp": 13000,
-      "durationDown": 13000
+      "durationDown": 13000,
+      "activeLow": false
     },
     {
       "accessory": "Blinds",
       "name": "Bedroom",
       "pinUp": 4,
       "pinDown": 3,
       "durationUp": 27000,
-      "durationDown": 25000
+      "durationDown": 25000,
+      "activeLow": false
     }
   ]
-}
+}

index.js

@@ -1,3 +1,4 @@
+var _ = require("underscore");
 var rpio = require("rpio");
 var Service, Characteristic;
 
@@ -13,12 +14,16 @@ module.exports = function(homebridge) {
 }
 
 function BlindsAccessory(log, config) {
+  _.defaults(config, {activeLow: true});
+
   this.log = log;
   this.name = config['name'];
   this.pinUp = config["pinUp"];
   this.pinDown = config["pinDown"];
   this.durationUp = config['durationUp'];
   this.durationDown = config['durationDown'];
+  this.initialState = config['activeLow'] ? rpio.HIGH : rpio.LOW;
+  this.activeState = config['activeLow'] ? rpio.LOW : rpio.HIGH;
 
   this.currentPosition = 0; // down by default
   this.targetPosition = 0; // down by default
@@ -36,8 +41,8 @@ function BlindsAccessory(log, config) {
   rpio.init({
     mapping: 'gpio'
   });
-  rpio.open(this.pinUp, rpio.OUTPUT, rpio.HIGH);
-  rpio.open(this.pinDown, rpio.OUTPUT, rpio.HIGH);
+  rpio.open(this.pinUp, rpio.OUTPUT, this.initialState);
+  rpio.open(this.pinDown, rpio.OUTPUT, this.initialState);
 
   this.service
     .getCharacteristic(Characteristic.CurrentPosition)
@@ -106,9 +111,9 @@ BlindsAccessory.prototype.setTargetPosition = function(position, callback) {
 }
 
 BlindsAccessory.prototype.togglePin = function(pin, duration) {
-  rpio.write(pin, rpio.LOW);
+  rpio.write(pin, this.activeState);
   setTimeout(function() {
-    rpio.write(pin, rpio.HIGH);
+    rpio.write(pin, this.initialState);
   }.bind(this), duration);
 }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "homebridge-gpio-blinds",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "Homebridge plugin to control blinds via Raspberry Pi GPIO pins",
   "license": "MIT",
   "keywords": [
@@ -16,7 +16,8 @@
     "url": "https://github.com/rsporny/homebridge-gpio-blinds"
   },
   "dependencies": {
-    "rpio": "^0.9.12"
+    "rpio": "^0.9.12",
+    "underscore": "^1.8.3"
   },
   "engines": {
     "homebridge": ">=0.4.6",