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Update Board - CJMCU.md 

Added information on how to charge a battery using the onboard TP4056.
Added clarification and notes to the RX Connections section about the VCC pin.
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Velyks 2015-01-07 10:52:09 +00:00
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docs/Board - CJMCU.md
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@ -24,9 +24,11 @@ Version 2 boards are supported from firmware v1.4.0 onwards, do NOT flash earlie
| PA1 | RC Channel 2 |
| PA2 | RC Channel 3 / USART2 TX |
| PA3 | RC Channel 4 / USART2 RX |
| VCC | Power +3.3v |
| VCC | Power (See note) |
| GND | Ground |
NOTE: The VCC RX Pin is not regulated and will supply what ever voltage is provided to the board, this will mean it'll provide 5v if a 5v serial connection is used. Be careful if you are using a voltage sensitive RX. A regulated 3.3v supply can be found on the top pin of column 1, just below the RX GND pin.
## Serial Connections
USART1 (along with power) is on the following pins.
@ -112,6 +114,26 @@ To flash the board:
boot, if anything goes wrong, simply unsolder these pins and the bootloader will start, allowing you to reflash. You cannot
overwrite the bootloader.
# Charging
The CJMCU has on it a TP4056 Lithium battery charging IC that can charge a 1S battery at 1A using a provided 5v supply attached to the 5v serial pin.
To charge an attached battery:
* Set the power switch to OFF
* Set the charge switch to CHG
* Plug in a 1S battery to the battery pins
* Plug in a 5v supply to the 5v serial pins
The two nearby LEDs will show the status of charging:
| Status | Green LED | Red LED |
|--------------------|-----------|-----------|
| Charging | On | Off |
| Finished | Off | On |
| 5v not connected | Off | Off |
| Batt not connected | Flashing | On |
# Helpful Hints
* If you are only using a 4 channel RX, in the auxiliary configuration tab, you can add a "Horizon" mode range around 1500