ESP-01S

Quick Start Guide ESP-01S

Pin	Working Mode	Flash Mode	Description
VCC, GND*			power supply, better use a standalone, and share ground with uart port
TXD, RXD**			uart interface
RST			Restart on low TTL
CH_PD	1	1	Chip select enable, constant High TTL always
GPIO 15	0	0	Low TTL on boot , N/A for ESP-01
GPIO0	1	0	Switch working / flash mode
GPIO 2	1	1	High TTL on boot
Red LEDs			(cancelled on latest) constants on to show the power status
Blue LEDs			blink when data come through

Use FT232RL can supply enough power, must be genius IC of course
Swap the uart pins if no data show up on the monitor
There are two leds on the board, one is power led (RED), another one is status LED(BLUE), when power up, pwr led keeps on and status led will blink once.
baud rate may work at 9600 or 115200

Check list	Description
Check default wifi status	if your devices (e.g. your phone) can find a wifi spot named like "ESP_98529F", "AI-...." or similar, the later number part is the mac ID, if you can see this wifi spot, it means your module boot up successfully
check LED status and wiring	blue led will blink once on boot up, serial data output "ESP Ready", Tick "new line" option on USB-TTL serial port monitor tool, Try baudrate 9600 or 115200 default firmware use these two
Check power supply	use shared GND will standalone power supply
Check IO15 status	connect GPIO15 to GND on boot if you are using the SMD model

Use power source that can provide sufficient current, better not using power from USB-TTL module
Module will automatically disconnect "unlink" TCP/UDP when no data go through
Wifi password length must be more than 8 bytes