ESP-01 DAT
hardware
- GND - Ground
- GPIO2 - General Purpose Input/Output
- GPIO0 - General Purpose Input/Output (Used for boot mode too)
- UXRXD - Receiver (for serial communication)
- U0TXD - Transmitter (for serial communication)
- CH_PD - Chip powerdown
- EXT_RSTB - Reset
- VCC - 3.3v input voltage
on board LED
https://www.microchip.ua/wireless/esp01.pdf
The blue LED on the ESP-01 module is connected to GPIO1 (UART0_TXD)
arduino uploading
- debug set to serial1 or disable
- crystal 40M
- flash 26M
- DOUT
- v2
- buildin LED = 2 or else
