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ESP8266EX Beginner's Guide
MTDO GPIO0 GPIO2
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0
1.2.5. Hardware Development Kit
Espressif provides a demo board for ESP8266EX.
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▪ External power supply: 5V, 1A, positive in, negative out.
▪ External 5V power supply split through 3 LDO for ESP8266: PA, LNA and IO. Blue
variable resistor can be used to adjust the value of the three power supplies. Please
make sure the supply voltage is within the specified range.
▪ Reset button connected to EXT_RSTB, for external reset. Toggle switch is connected
to the chip enable, please pay attention to maintaining a high (switch down) when
used.
▪ Users can either use the RS-232 serial port or UART connector board for download,
print log and serial communication.
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P a g e
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Mode
X
X
SDIO/SPI
0
1
UART Download
1
1
Flash Boot
Figure 4: ESP8266EX Demo Board (Brief Outline)
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September 17, 2014
Espressif
Systems
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