Faketec Plus CN3791 LiPo Solar Charger

+ -----------------------------------------------+
| Faketec Plus CN3791 LiPo Battery Solar Charger |
+------------------------------------------------+

Open Hardware schematic and pcb design of a Meshtastic Faketec
board and a solar charger.  Solar powered switch-mode charger (CN3791) and
discharge protector (XB8089D0) for LiPo batteries. The charger provides
maximum power point tracking (MPPT) and can easily be modified to work with
LiFePO4 batteries by replacing the CN3791 with a CN3801.
                                                                              ^
+---------+  +------+  +------+                  +-----------+  +----------+  ^
| four    |  |  5 V |--| MPPT |                  |   DIY     |  | core1262 |  |
| solar   |--|  6 V |  +------+                  | nrf52840  |--|   or     |--+
| panels  |  |  9 V |     |      +------------+  |(GPS)(OLED)|  | HT-RA62  |
| (orred) |  | 12 V |  +------+  | discharge  |--| (Power2)  |  +----------+
+---------+  |select|  | LiPo |--| protection |  | (Power3)  |
             +------+  +------+  +------------+  +-----------+  

The board is slotted so that the power supply section can be removed from the
Meshtastic chipset if noise reduction is needed.

All of the bottom layer surface mount components can be mounted by the pcb manufacturer.
This excludes the micro, radio module and pushbuttons.

See schematic for JP1 to JP6.

To do:

1. final check and comments from community and release v0.6 (done)
2. order five prototypes (done)
3. build core1262 and test
4. build HT-RA62 and test (HT-RA62 working)
5. test GPS
6. test OLED
7. power outputs

References:

- http://www.consonance-elec.com/en/products_32/
- https://github.com/joric/nrfmicro/wiki/Alternatives/

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