Esp8266 Esp-01 Datasheet New! -

The ESP-01 does not have a USB port. You need a (like FTDI, CH340, or CP2102) set to 3.3V logic.

The is a low-cost, compact, and capable Wi-Fi module suitable for hobbyist and embedded projects where minimal I/O and small size are priorities. However, its limitations (512 KB flash, missing ADC, no deep-sleep wake, 3.3V only, boot strapping constraints) make it less suitable for battery-powered or sensor-rich applications. For advanced projects, the ESP-01S (1 MB flash) or ESP-12 series are recommended.