Pin Number
|
Pin name
|
Function
|
Used For
|
1
|
3V3
|
3V3
|
Power for ESP8266/display
|
2
|
VSYS
|
VSYS
|
VSYS in, VBAT sensing with ATMega
|
3
|
GPIO2
|
SDA
|
I2C - ATMega, MCP23017, expansion header, testpoints
|
4
|
VSYS
|
VSYS
|
VSYS in, VSYS sensing with ATMega
|
5
|
GPIO3
|
SCL
|
I2C - ATMega, MCP23017, expansion header, testpoints
|
6
|
GND
|
GND
|
Ground
|
7
|
GPIO4
|
GPIO
|
IR TX
|
8
|
GPIO14
|
RXD
|
GSM UART TXD
|
9
|
GND
|
GND
|
Ground
|
10
|
GPIO15
|
TXD
|
GSM UART RXD
|
11
|
GPIO17
|
GPIO
|
Expansion header / SPI1 / IR RX
|
12
|
GPIO18
|
GPIO
|
Expansion Header / I2S / SPI1
|
13
|
GPIO27
|
SD_D3
|
ESP8266 SDIO pin / ESP-socket GPIO expansion
|
14
|
GND
|
GND
|
Ground
|
15
|
GPIO22
|
SD_CLK
|
ESP8266 SDIO pin / ESP-socket GPIO expansion
|
16
|
GPIO23
|
SD_CMD
|
IESP8266 SDIO pin / ESP-socket GPIO expansion
|
17
|
3V3
|
3V3
|
Power for ATMega
|
18
|
GPIO24
|
SD_D0
|
ESP8266 SDIO pin / ESP-socket GPIO expansion
|
19
|
GPIO10
|
SPI_MOSI
|
Display SPI interface, expansion header
|
20
|
GND
|
GND
|
Ground
|
21
|
GPIO9
|
SPI_MISO
|
Expansion header - SPI
|
22
|
GPIO25
|
SD_D1
|
ESP8266 SDIO pin / ESP-socket GPIO expansion
|
23
|
GPIO11
|
SCK
|
Display SPI interface, expansion header
|
24
|
GPIO8
|
SPI_CSO
|
Display SPI interface
|
25
|
GND
|
GND
|
Ground
|
26
|
GPIO7
|
SPI_CS1
|
Expansion header - SPI
|
27
|
GPIO0
|
SD_RST
|
EEPROM SDA / ESP8266 RESET pin / ESP-socket GPIO expansion
|
28
|
GPIO1
|
MCP_INT
|
EEPROM SCL / MCP23017 interrupt pin
|
29
|
GPIO5
|
DP_RST
|
Keypad GPIO / Display SPI interface
|
30
|
GND
|
GND
|
Ground
|
31
|
GPIO6
|
DP_DC
|
Display SPI interface
|
32
|
GPIO12
|
AUDIO_0
|
PWM audio
|
33
|
GPIO13
|
AUDIO_1
|
PWM audio
|
34
|
GND
|
GND
|
Ground
|
35
|
GPIO19
|
GPIO
|
Expansion header / I2S / SPI1
|
36
|
GPIO16
|
KEYPAD_INT
|
ATMega328p interrupt pin
|
37
|
GPIO26
|
SD_D2
|
ESP8266 SDIO pin / ESP-socket GPIO expansion
|
38
|
GPIO20
|
GPIO
|
Expansion header / I2S / SPI1
|
39
|
GND
|
GND
|
Ground
|
40
|
GPIO21
|
GPIO
|
Expansion header /I2S / SPI1
|