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    <p>First change your </p> <pre><code>#ifndef serialComms #define serialComms </code></pre> <p>to </p> <pre><code>#ifndef serialComms_h #define serialComms_h </code></pre> <p>You can not have a macro with the same name as an instance.</p> <p>Then check you capitalization e.g. readBytes vs testing.readbytes(); notice the B</p> <hr> <p>Make SURE you close out all your Arduino IDE's when making a NEW library directory and initial files with in it, for the first time. The IDE on startup caches a list of the files. They can subsequently change there insides. but new files will not be known until the next start.</p> <hr> <p>The following compiles fine for me. Once I corrected all the typo's:</p> <p>definetest.ino</p> <pre><code>#include &lt;serialComms.h&gt; serialComms testing; void setup() { Serial.begin(9600); } void loop() { } void serialEvent() { testing.readBytes(); testing.assignBytes(); } </code></pre> <p>serialComms.cpp</p> <pre><code>#ifndef serialComms_h #define serialComms_h /* serialComms Class */ class serialComms { public: // serialComms() {}; void init(); void readBytes(); // Will be used to create the array --&gt; two variables for now... void assignBytes(); }; #endif </code></pre> <p>serialComms.h</p> <pre><code>#include &lt;Arduino.h&gt; #include &lt;serialComms.h&gt; void serialComms::init() { // This is where the constructor would be...right now we are too stupid to have one } void serialComms::readBytes() // Target Pin,Values { digitalWrite(11,HIGH); delay(250); digitalWrite(11,LOW); assignBytes(); } void serialComms::assignBytes() { for(int t = 0;t&lt;5;t++) { digitalWrite(10,HIGH); delay(250); digitalWrite(10,LOW); } } </code></pre>
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    1. COChanged those, got these errors 'testingLibraries:2: error: 'serialComms' does not name a type' 'testingLibraries.ino: In function 'void serialEvent()':' 'testingLibraries:16: error: 'testing' was not declared in this scope'
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    2. COadded code with typos fixed.
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    3. COThis worked perfectly, thank you, I am now having trouble trying to pass arrays, do I need to use pointers to do this? I'm not sure
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