107 lines
3.7 KiB
ReStructuredText
107 lines
3.7 KiB
ReStructuredText
.. _hardware:
|
|
|
|
Hardware
|
|
########
|
|
|
|
iSpindle based on esp8266
|
|
=========================
|
|
|
|
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. I typically use one of the
|
|
excellent pcb boards that, for example the iSpindel PCB v4.0 from Cherry Philip. Here is one of my standard builds using an esp8266.
|
|
|
|
.. image:: images/ispindel_esp8266.jpg
|
|
:width: 500
|
|
:alt: iSpindle esp8266
|
|
|
|
Schema for esp8266 build
|
|
++++++++++++++++++++++++
|
|
|
|
.. image:: images/schema_esp8266.png
|
|
:width: 700
|
|
:alt: Schema esp8266
|
|
|
|
iSpindle based on esp32
|
|
=======================
|
|
|
|
I've experimented with porting my software version to esp32 and this is a selection of options i have been testing.
|
|
|
|
.. warning::
|
|
Work to support esp32s2 is still ongoing, ESP32-mini and ESP32c3-mini is confirmed to be working. However I would recommend the C3 variant.
|
|
|
|
.. image:: images/esp32_hardware.jpg
|
|
:width: 500
|
|
:alt: iSpindle esp32 hardware options
|
|
|
|
* esp32 mini, this was the first board i tried which is a smaller form factor of the first generetion esp32 with 2 cores. Slow on connecting to wifi is the main downside.
|
|
* esp32c3 mini, a newer version based on the latest risc v7 architecture, is seen as the replacement for the esp8266 with bluetooth support.
|
|
* esp32s2 mini, similar to the c3 board but without bluetooth support.
|
|
|
|
It's possible to use this PCB and mount an ESP32 mini on top of that (c3 and s2 are prefered). The esp32 mini is a larger formfactor and can be hard to fit into the tube.
|
|
|
|
.. note::
|
|
You need to add a resistor between A0 (Analog PIN) and ground of 470k. The reason is that the esp8266 has a build in resistor for a voltage divider
|
|
which 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
|
|
need to adjust the voltage factor so the battery reading is correct.
|
|
|
|
ESP32c3 mini
|
|
++++++++++++
|
|
|
|
This is model is now fully supported by gravitymon.
|
|
|
|
.. image:: images/ispindel_esp32c3.jpg
|
|
:width: 500
|
|
:alt: Esp32c3 mini build
|
|
|
|
Here is an image of where I added the resistor for the voltage divider.
|
|
|
|
.. image:: images/esp32_res.jpg
|
|
:width: 500
|
|
:alt: Esp32c3 adding resistor as voltage dividier.
|
|
|
|
ESP32s2 mini
|
|
++++++++++++
|
|
|
|
This is model is now fully supported by gravitymon. Same setup as for ESP32C3 mini.
|
|
|
|
ESP32 d1 mini
|
|
+++++++++++++
|
|
|
|
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.
|
|
|
|
.. image:: images/ispindel_esp32.jpg
|
|
:width: 500
|
|
:alt: Esp32 mini build
|
|
|
|
Schema for esp32 build
|
|
++++++++++++++++++++++
|
|
|
|
.. note::
|
|
This schema assumes that an ESP32 D1 Mini (pin compatible with ESP8266 D1 Mini is used). The ESP32 has two rows of pins but
|
|
only the inner row is used. The main difference is the added resistor R3 so we get a voltage divider for measuring battery.
|
|
The ESP8266 has a built in resistor thats not visible on the schema and this acts as a voltage divider.
|
|
|
|
.. image:: images/schema_esp32.png
|
|
:width: 700
|
|
:alt: Schema esp32
|
|
|
|
Adding a reed (magnetic) reset switch
|
|
=====================================
|
|
|
|
A reed switch is a switch that reacts to magnetic fields. The ones I have tested are normally open and close in proximity to
|
|
a magnet.
|
|
|
|
.. image:: images/reed.jpg
|
|
:width: 400
|
|
:alt: Reed switch
|
|
|
|
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
|
|
I mounted the iSPINDLE PCB v4.0 just under the cap. The lower red circle shows the reset connection point for the reed switch.
|
|
|
|
The reed switch is the glass tube visible under the esp8266.
|
|
|
|
.. image:: images/reed_build.jpg
|
|
:width: 400
|
|
:alt: Reed build
|
|
|
|
|