SunFounder 3in1 Kit - Page 12

SunFounder 3in1 Kit
Table 1: ESP8266-01 Pins
Pin Name Description
1 TXD UART_TXD, sending; General Purpose Input/Outpu: GPIO1; Pull-down is
not allowed when startup.
2 GND GND
3 CU_PD Working at high level; Power off when low level is supplied.
4 GPIO2 It should be high level when power on, hardware pull-down is not allowed;
Pull-up by default;
5 RST External Reset signal, reset when low level is supplied; work when high level
is supplied (high level by default);
6 GPIO0 WiFi Status indicator; Operation mode selection: Pull-up: Flash Boot, op-
eration mode; Pull-down: UART Download, download mode
7 VCC Power Supply(3.3V)
8 RXD UART_RXDReceiving; General Purpose Input/Output: GPIO3;
• ESP8266 - Espressif
• ESP8266 AT Instruction Set
8 Chapter 1. Components List and Introduction