Esp8266 HC22

Pinout

esp8266-hc22-pinout.jpg
esp8266-hc22-pinout1.jpg
esp8266-hc22-pinout2.jpg
Pin number Function Direction Explanation
1 UART_TX O UART data output, 3.3V level; when the power down is prohibited.
2 UART_RX I UART data input, 3.3V level.
3 GPIO15 I/O Universal input and output, internal module connected with pull-down resistors, electrical work on the module; The feet high, the module power does not work.
4 GPIO13 I/O General Purpose Input Output
5 ADC I AD input voltage range is between 0V to 1.024V, thecorresponding values are 0—1024, 10 accuracy.
6 CH_PD I Module enable input, the default pull the module to work; then low, Close WIFI chip inside the module, the current is very small (less than 10 μA).
7 GPIO16 I/O General Purpose Input / Output
8 GPIO14 I/O General Purpose Input / Output
9 GPIO12 I/O General Purpose Input / Output
10 NC
11 NRST I Module hardware reset input (active low)
12 VCC I Power, 3.3 ± 0.3 V
13 GND I Earthing
14 GND I Earthing
15 GPIO2 I/O General-purpose input / output; internal pull, turn on the power to prohibit the hardware pulldown.
16 GPIO4 I/O General Purpose Input / Output
17 GPIO0 I/O General-purpose input / output; float mode, drop down to the firmware download mode.
18 GPIO5 I/O General Purpose Input / Output
19 NC
20 NC
21 NC
22 NC
23 GPIO4 I/O General Purpose Input / Output
24 NC
25 NC
26 GPIO5 I/O General Purpose Input / Output
27 VCC I Power, 3.3 ± 0.3 V
28 GND I Earthing
29 UART_RX I UART data input, 3.3V level.
30 UART_TX O UART data output, 3.3V level; when the power down is prohibited.

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