This board is perfectly fine, it was a batch with missing line so flash button doesn't work. If you need it, you can solder jump wire.Designed by AdvanceIT in Bosnia and Herzegovina
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It's same board as ESP-RFID Board ESP-RFID Board but in this batch there was an error where RESET and FLASH buttons were not connected properly.
However, if you need to reprogram ESP12F/ESP8266 on it, it's very easy to solder a jump wire and get FLASH button to work.
It was an error batch. But as a board it can be very useful if you are using 5V to 12V powersource for your device.
Please check the docs to get more idea about the board.
The best of all is that it's one of rare ESP8266 boards which work on 5V to 12V input voltage. Usually most boards stick to 5V which is sometimes not that common.
Also, in my opinion it's great board if you want to make time record system for office by hooking RFID reader in it.
It also has opensourced CAD design and BOM
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