The ESP8266-based simple programmable controller has made significant progress, with a built-in web page and Chinese programming capabilities. The device features two digital inputs and two relay outputs, and the codes are now complete. Notably, the ESP8266 still has approximately 6K of RAM space left after running the application.

In terms of flash usage, the controller requires a total of 2.7MByte of space for various purposes, including storing web pages, Chinese programs, user configuration data, and bootloader programs. Fortunately, the ESP8266-07S model has 4MByte of Flash space available, leaving ample room for future development and upgrades.

Source: https://dev.to/zhangzhuyue/ram-and-flash-usage-for-esp8266-based-simple-programmable-controller-5197