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OLIMEX© 2016
Upgrading ESP8266
CHAPTER 3: HARDWARE SETUP
CHAPTER 3: HARDWARE SETUP
The hardware setup consists of a powered ESP8266 board with a properly established connection
between the board and the personal computer via the serial cable.
The layout of the hardware connections can be found on the next page.
The hardest part of the hardware setup is probably connecting the USB < - > serial cable to the TX, RX,
and GND pins.
The connections are easier if the board has male UEXT connector (like ESP8266-EVB). The important part
here is to connect the GND of the cable to the GND pin (#2) of the UEXT connector. Then TXD of the
cable to RXD of the UEXT (#4). Finally, RXD of the cable to TXD of the UEXT (#3).
For connecting the USB < - > serial cable we are interested only in pins #2, #3 and #4.
Follow the same idea when you use MOD-WIFI-ESP8266 and MOD-WIFI-ESP8266-DEV – the idea is to
connect the cable to the RX, TX and GND signals. Refer to the schematic of your board to find the pins
where these signals are available.
Page 9 of 17
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