The ESP8266 is the predecessor of the new ESP32, a product specific for the Internet of Things market. Great quality/performance/price ratio, it makes sense to directly use this CPU only when the production volumes are very high. Otherwise, the ESP-WROOM-02 module, which contains the same CPU, is recommended. There is a custom firmware for ESP8266 with platform integration.
- 3.3V system
- SDK with FreeRTOS multi-tasking operating system
- WiFi 802.11 B/G connectivity with WEP support, WPA/WPA2 PSK/Enterprise
- Web Interface and OTA Update
- Hardwire OS already available and ready to use
- Many configurable GPIO