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<section id="linefollower-examples">
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<span id="lib-linefollower"></span><h1>Linefollower Examples<a class="headerlink" href="#linefollower-examples" title="Permalink to this headline"></a></h1>
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<section id="simple-linefollower">
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<h2>Simple Linefollower<a class="headerlink" href="#simple-linefollower" title="Permalink to this headline"></a></h2>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">compLib.Motor</span> <span class="kn">import</span> <span class="n">Motor</span>
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<span class="kn">from</span> <span class="nn">compLib.Display</span> <span class="kn">import</span> <span class="n">Display</span>
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<span class="kn">from</span> <span class="nn">compLib.IRSensor</span> <span class="kn">import</span> <span class="n">IRSensor</span>
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<span class="kn">from</span> <span class="nn">compLib.Encoder</span> <span class="kn">import</span> <span class="n">Encoder</span>
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<span class="kn">import</span> <span class="nn">time</span>
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<span class="n">IRSensor</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">IRSensor</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">IRSensor</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">IRSensor</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">IRSensor</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">DRIVE_SPEED</span> <span class="o">=</span> <span class="mi">85</span>
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<span class="n">TURN_SPEED</span> <span class="o">=</span> <span class="mi">50</span>
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<span class="n">COLOR_BREAK</span> <span class="o">=</span> <span class="mi">750</span>
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<span class="n">KP</span> <span class="o">=</span> <span class="mf">50.0</span>
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<span class="n">KD</span> <span class="o">=</span> <span class="mf">0.0</span>
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<span class="k">def</span> <span class="nf">drive</span><span class="p">(</span><span class="n">leftSpeed</span><span class="p">,</span> <span class="n">rightSpeed</span><span class="p">):</span>
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<span class="n">leftSpeed</span> <span class="o">*=</span> <span class="o">-</span><span class="mi">1</span>
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<span class="n">rightSpeed</span> <span class="o">*=</span> <span class="mf">0.906</span>
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<span class="n">Motor</span><span class="o">.</span><span class="n">power</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">min</span><span class="p">(</span><span class="nb">max</span><span class="p">(</span><span class="o">-</span><span class="mi">100</span><span class="p">,</span> <span class="n">leftSpeed</span><span class="p">),</span> <span class="mi">100</span><span class="p">))</span>
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<span class="n">Motor</span><span class="o">.</span><span class="n">power</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="nb">min</span><span class="p">(</span><span class="nb">max</span><span class="p">(</span><span class="o">-</span><span class="mi">100</span><span class="p">,</span> <span class="n">rightSpeed</span><span class="p">),</span> <span class="mi">100</span><span class="p">))</span>
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<span class="k">def</span> <span class="nf">follow</span><span class="p">(</span><span class="n">sleepTime</span> <span class="o">=</span> <span class="mf">0.1</span><span class="p">):</span>
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<span class="n">lastError</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="n">sensorsBlack</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="k">while</span> <span class="n">sensorsBlack</span> <span class="o"><</span> <span class="mi">3</span><span class="p">:</span>
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<span class="n">sensorsBlack</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">6</span><span class="p">):</span>
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<span class="k">if</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">sensorsBlack</span> <span class="o">+=</span> <span class="mi">1</span>
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<span class="n">error</span> <span class="o">=</span> <span class="n">lastError</span>
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<span class="k">if</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="k">elif</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="o">-</span><span class="mf">1.5</span>
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<span class="k">elif</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="mf">1.5</span>
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<span class="k">elif</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
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<span class="k">elif</span> <span class="n">IRSensor</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span> <span class="o">></span> <span class="n">COLOR_BREAK</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="mi">1</span>
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<span class="k">elif</span> <span class="n">error</span> <span class="o">==</span> <span class="mf">1.5</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="mi">3</span>
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<span class="k">elif</span> <span class="n">error</span> <span class="o">==</span> <span class="o">-</span><span class="mf">1.5</span><span class="p">:</span>
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<span class="n">error</span> <span class="o">=</span> <span class="o">-</span><span class="mi">3</span>
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<span class="n">lastError</span> <span class="o">=</span> <span class="n">error</span>
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<span class="n">adjustment</span> <span class="o">=</span> <span class="n">KP</span> <span class="o">*</span> <span class="n">error</span> <span class="o">+</span> <span class="n">KD</span> <span class="o">*</span> <span class="p">(</span><span class="n">error</span> <span class="o">-</span> <span class="n">lastError</span><span class="p">)</span>
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<span class="n">leftSpeed</span> <span class="o">=</span> <span class="n">DRIVE_SPEED</span> <span class="o">+</span> <span class="n">adjustment</span>
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<span class="n">rightSpeed</span> <span class="o">=</span> <span class="n">DRIVE_SPEED</span> <span class="o">-</span> <span class="n">adjustment</span>
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<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">leftSpeed</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">rightSpeed</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">adjustment</span><span class="si">}</span><span class="s2"> </span><span class="si">{</span><span class="n">error</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span>
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<span class="n">drive</span><span class="p">(</span><span class="n">leftSpeed</span><span class="p">,</span> <span class="n">rightSpeed</span><span class="p">)</span>
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<span class="n">drive</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
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<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">sleepTime</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
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<span class="n">follow</span><span class="p">()</span>
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<span class="n">follow</span><span class="p">()</span>
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<span class="n">follow</span><span class="p">()</span>
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<span class="n">follow</span><span class="p">()</span>
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<span class="n">follow</span><span class="p">(</span><span class="mf">0.2</span><span class="p">)</span>
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<span class="n">main</span><span class="p">()</span>
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