Hardware Assembly
=================

This section covers wiring the electronics together. Gather the parts from the
:doc:`../bill-of-materials` first. If you also want to print an enclosure, see
:doc:`../3d-printing/index`.

.. toctree::
   :maxdepth: 1

   wiring
   coin-acceptor

Assembly order
--------------

1. Set the step-up converter's output voltage **before** connecting the coin
   acceptor (it runs on 12 V). See :doc:`coin-acceptor`.
2. Wire the e-paper display to the ESP32 — see the pin tables in :doc:`wiring`.
3. Connect the coin acceptor and its blocking MOSFET (:doc:`wiring`).
4. Connect the LED push button (:doc:`wiring`).
5. Cross-check everything against the circuit diagram for your board below.

Circuit diagrams
----------------

There are two wiring options depending on which ESP32 / display-driver
combination you use.

**1. Standard ESP32 with a separate display / driver board**

.. figure:: ../assets/schematics/offlineATM-xxxxxx.png
   :width: 100%
   :alt: Circuit diagram for a standard ESP32

   Wiring for a standard ESP32 (the "Generic" board profile).

**2. Waveshare ESP32 with an integrated driver board and a separate display**

.. figure:: ../assets/schematics/offlineATM-WaveshareESP32-xxxxxx.png
   :width: 100%
   :alt: Circuit diagram for a Waveshare ESP32

   Wiring for the Waveshare ESP32 driver board (the "Waveshare" board profile).

.. note::

   Higher-resolution and editable sources are in the repository:
   `standard ESP32 (SVG) <https://github.com/f321x/offline-bitcoin-atm/blob/master/docs/assets/schematics/offlineATM-837791.svg>`__,
   `Waveshare ESP32 (SVG) <https://github.com/f321x/offline-bitcoin-atm/blob/master/docs/assets/schematics/offlineATM-WaveshareESP32-840538.svg>`__,
   and the editable
   `Visio source (.vsdx) <https://github.com/f321x/offline-bitcoin-atm/blob/master/docs/assets/schematics/offlineATM-837791.vsdx>`__.

Construction photos
-------------------

The following photos show a build using the Waveshare ESP32 driver board.

.. figure:: ../assets/photos/WaveshareESP32_construction_001.jpg
   :width: 100%
   :alt: Waveshare ESP32 construction, view 1

.. figure:: ../assets/photos/WaveshareESP32_construction_002.jpg
   :width: 100%
   :alt: Waveshare ESP32 construction, view 2

.. figure:: ../assets/photos/WaveshareESP32_construction_003.jpg
   :width: 100%
   :alt: Waveshare ESP32 construction, view 3

.. figure:: ../assets/photos/WaveshareESP32_construction_004.jpg
   :width: 100%
   :alt: Waveshare ESP32 construction, view 4

.. figure:: ../assets/photos/WaveshareESP32_construction_005.jpg
   :width: 100%
   :alt: Waveshare ESP32 construction, view 5