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<div class="section" id="hardware">
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<span id="id1"></span><h1>Hardware<a class="headerlink" href="#hardware" title="Permalink to this headline">#</a></h1>
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<p>There are lots of resouces out there on how to build the hardware for an iSpindle so I will not go into details on that part. Here are two of my builds using the iSpindle PCB v4.</p>
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<a class="reference internal image-reference" href="_images/ispindel.jpg"><img alt="Builds of iSpindel" src="_images/ispindel.jpg" style="width: 500px;"/></a>
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<p>It’s possible to use this PCB and mount an ESP32 on top of that. It must be an pin compatible ESP32 and the one I used was called <em>ESP32 d1 mini</em>. Since this is the same width as the PCB you need to
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mount it really close to the PCB in order for it to fit in the PET tube/container. I also had to smooth the edge of the ESP32 in order for it to fit.</p>
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<p>I would suggest that you try how it fits into the PET tube before soldering it to the PCB. Make sure that the battery is attached since this will be a really tight fit.</p>
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<p>You also need to desolder (remove) the RED ON LED from the ESP32 or the battery power will be reduced a lot.</p>
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<p>Final thing is to add a resistor between A0 (Analog PIN) and ground of 470k. The reason is that the esp8266 has a build in resistor which
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the esp32 does not have. So in order to get a valid voltage (less than 3.2V) on the A0 pin this is needed. Once the modification is done you might
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need to adjust the voltage factor so the battery reading is correct.</p>
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<a class="reference internal image-reference" href="_images/esp32.jpg"><img alt="Mounting esp32" src="_images/esp32.jpg" style="width: 500px;"/></a>
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<div class="section" id="schema-for-esp8266-build">
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<h2>Schema for esp8266 build<a class="headerlink" href="#schema-for-esp8266-build" title="Permalink to this headline">#</a></h2>
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<a class="reference internal image-reference" href="_images/schema_esp8266.png"><img alt="Schema esp8266" src="_images/schema_esp8266.png" style="width: 700px;"/></a>
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</div>
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<div class="section" id="schema-for-esp32-build">
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<h2>Schema for esp32 build<a class="headerlink" href="#schema-for-esp32-build" title="Permalink to this headline">#</a></h2>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>This schema assumes that an ESP32 D1 Mini (pin compatible with ESP8266 D1 Mini is used)
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The ESP32 has two rows of pins but only the inner row is used. The main difference is the added resistor R3 so we
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get a voltage divider for measuring battery. The ESP8266 has a built in resistor thats not visible on the schema.</p>
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</div>
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<a class="reference internal image-reference" href="_images/schema_esp32.png"><img alt="Schema esp32" src="_images/schema_esp32.png" style="width: 700px;"/></a>
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