67 lines
2.5 KiB
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67 lines
2.5 KiB
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.. _hardware:
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Hardware
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There are lots of resources 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.
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.. image:: images/ispindel.jpg
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:width: 500
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:alt: Builds of iSpindel
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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 *ESP32 d1 mini*. 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.
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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.
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You also need to desolder (remove) the RED ON LED from the ESP32 or the battery power will be reduced a lot.
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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.
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.. image:: images/esp32.jpg
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:width: 500
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:alt: Mounting esp32
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Schema for esp8266 build
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.. image:: images/schema_esp8266.png
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:width: 700
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:alt: Schema esp8266
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Schema for esp32 build
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----------------------
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.. note::
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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.
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.. image:: images/schema_esp32.png
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:width: 700
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:alt: Schema esp32
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Modifying with reed switch
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--------------------------
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A reed switch is a switch that reacts to magnetic fields. The ones I have tested are normally open and close in proximity to
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a magnet.
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.. image:: images/reed.jpg
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:width: 400
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:alt: Reed switch
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If this is connected to the reset button a magnet can be used to trigger a reset of the device. The image below shows how
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I mounted the iSPINDLE PCB v4.0 just under the cap. The lower red circle shows the reset connection point for the reed switch.
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The reed switch is the glass tube visible under the esp8266.
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.. image:: images/reed_build.jpg
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:width: 400
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:alt: Reed build
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