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                <div ng-app="puppets">
  <div class="puppet">
    <arm id="left" commands="left" controller="leftArm"></arm>
    <arm id="right" commands="right" controller="rightArm"></arm>
  <div class="puppeteer events">
    <button ng-click="$broadcast('arm:wave', 'left')">wave left</button>
    <button ng-click="$broadcast('arm:wave', 'right')">wave right</button>
    <button ng-click="$broadcast('arm:wave')">wave both</button>
  <div class="puppeteer commands">
    <button ng-click="left.wave()">wave left</button>
    <button ng-click="right.wave()">wave right</button>
  <div class="puppeteer controller">
    <button ng-click="leftArm.wave()">wave left</button>
    <button ng-click="rightArm.wave()">wave right</button>




                var app = angular.module('puppets', []);

app.directive('arm', function() {
  function wave() {
  return {
    restrict: 'AE',
    template: '<div>arm</div>',
    scope: {
      id: '@',        // control via events
      commands: '=?',  // control via commands
      controller: '=?' // control via controller
    controller: function($scope) {
      // Control via events
      $scope.$on('arm:wave', function(e, id) {
        if(id === undefined || $ === id) {
      // controll via commands
      $scope.commands = { wave: wave };
      // control via controller
      this.wave = wave;
      $scope.controller = this;