Hardware_versions

tommie edited this page Nov 15, 2014 · 13 revisions

ESP-01, Versions 1 and 2

Info

For enabling the chip in the second version, bind pin CH_PD to VCC (3.3v).

Pins to chip names

Pin Name Description
1 GND Ground
2 U0TXD UART0 Transmit
3 GPIO2 Has internal pull-up
4 CHIP_EN Chip Enable, active high
5 GPIO0 Has internal pull-up
6 EXT_RSTB External reset signal, active low, has no pull-up? Spurious blue LED activity when attaching a DMM between GND and RST to check voltage.
7 U0RXD UART0 Receive, has internal pull-up
8 VDD +3.3V power input

LEDs

Color Name Description
Red PWR Tied to VCC, so always on when power is applied
Blue TXD UART TX indicator, tied in hardware to U0TXD

ESP-03

Info

Starting the module bind CH_PD to VCC (3.3v) and GPIO15 to GND

ESP8266MOD

References