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doc: fix typos

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King Kévin 2023-11-28 19:52:03 +01:00
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README.md
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@ -6,11 +6,13 @@ purpose
The [WLED](https://kno.wled.ge/) firmware is ideal to control addressable LEDs strip.
WLED chain is a hardware board for it, matching my usage: robust remotely controlled LED strip based light installations for festivals.
It allows to:
- use of the shelf 12-48V power supplies to power the 5V LED strips
- use of the shelf 12-48V power supplies to power 5V LED strips
- inter-connect the boards to form long chains (only connecting the first to externally provided power and data)
- use cheap Ethernet CAT5E cables to inter-connect them (also over long distances)
- provide power and data over the Ethernet cables
- provide power and data (DMX512) over the Ethernet cables
- proper 5V LED data signal output (up to three of them)
- embed microphone for sound reactive effects
usage
=====
@ -18,7 +20,7 @@ usage
flashing
--------
Once the board is assembled, press the DL button on the bottom side (if populated) or short DL with 0V using tweezers while powering up the board.
Once the board is assembled, press the DL button on the bottom side (if populated) or short DL with 0V on the side of the MCU using tweezers while powering up the board.
This will put the ESP32-S2 into download mode and allow flashing the [WLED firmware](https://github.com/Aircoookie/WLED/releases) using [esptool](https://github.com/espressif/esptool) as follows (the [web interface](https://install.wled.me/) fails installing over USB CDC ACM):
~~~
@ -227,7 +229,7 @@ In case the board is not mounted in the enclosure, other ports can be used.
8-60V power input can be connected using the 2.1/5.5 mm ID/OD DC barrel jack.
The Ethernet cables can be directly connected using the two RJ45 ports (either is fine as they are interconnected).
The USB, DC barrel, and RJ45 port are not accessible when the board is in the enclosure simply because there isn't enough space.
The USB, DC barrel, and RJ45 ports are not accessible when the board is in the enclosure simply because there isn't enough space.
But feel free to add hole to the enclosure to access them.
This would also remove the waterproof advantage though.
@ -259,7 +261,7 @@ Features will not be implemented:
- XLR DMX512 connectors: they take too much space and I never know if I should use the 3 or 5-pin variant. Instead I designed a separate DMX + power injector adapter board
- full galvanic isolation: not really needed as the devices should be chained with a single power supply, preventing any ground potential difference. Another splitter board could provide isolation, at the beginning of the chain.
- USB Power Delivery: this is just a convenience feature, but using expensive lower power USB chargers with expensive ISB-C cables is not ideal for the intended usage (festival installation)
- USB Power Delivery: this is just a convenience feature, but using expensive lower power USB chargers with expensive ISB-C cables is not ideal for the intended usage (festival installation). And you can still use power-delivery by adding a cheap PD trigger board next to it.
- Lithium battery input and charger: it does not fit the intended usage, with large external power supplies providing enough power for power hungry LED strips. Small batteries would not be able to handle that over longer time. You can still use the power bank on the 5V power input though, and charge the battery separately. The 8-60V allows connecting 3-13S LiPo batteries.
- Power over Ethernet (active): I do use passive Power over Ethernet, by providing power on 2 pairs of the Ethernet cable that are not used for 10/100 Mbps communication. This allows using very simple and inexpensive injectors to power power, using and power supply. Active PoE require specials and more expensive injectors or power supplies, and complex extractors in each device. Feel free to use PoE though. There are plenty of relatively cheap injectors and extractors that you can use as external devices next to the boards.
- fuse protection for input and output protection, round or automotive: there is not enough space to place such large fuses. We already have one input protection (fuse + reverse polarity on 8-60V), so you just have pay attention to the 5V outputs (limited to 5A by the DC-DC converter) or input (supported, but not the intended use).