The ESP-01s 2023 version features the advanced ESP8285 MCU, fully compatible with the earlier ESP-01 model that utilized the ESP8266EX. The ESP8285 MCU integrates 1MB flash memory within the chip, eliminating the need for an external SPI flash, thus reducing power consumption and improving reliability. This updated module addresses Wi-Fi bugs found in the ESP8266EX, offering more secure and stable connections. The ESP-01s continues to support both the AT-Command set for use as a Wi-Fi adapter and direct C coding for standalone applications, ensuring seamless integration with previous models.

Specifications of ESP8285 Module Compatibility Replaces ESP-01 ESP-01S

MCU: ESP8285 (replaces ESP8266EX)
Flash Memory: 1MB integrated on-chip
Wi-Fi Standards: IEEE 802.11 b/g/n
Interfaces: SPI/SDIO, UART
Processor: Tensilica L106 32-bit processor
GPIOs: Multiple for external sensor and device interfacing
Power Consumption: Lower than ESP8266EX due to fewer external components
Antenna: Integrated with switches, RF balun, power amplifier, low noise receive amplifier, and filters
SDK Support: Available with sample codes for various applications
Compatibility: Fully compatible with ESP-01 and ESP-01S modules
Dimensions: Compact, minimizing PCB size requirements