The Arduino Core for ESP8266 and ESP32 uses one SPI flash memory sector to emulate an EEPROM. When you initialize the EEPROM object (calling begin) it reads the contents of the sector into a memory buffer. Reading a writing is done over that in-memory buffer. Whenever you call commit it write the contents back to the flash sector. Due to the nature of this flash memory (NOR) a full sector erase must be done prior to write any new data....
Some weeks ago I received a parcel from Itead. Previously, I had written about the Sonoff and they were kind enough to send me two more of their home automation products for me to review: the S20 Smart Socket I wrote about two weeks ago and the Slampher. The Slampher comes in a simple cardboard box with no documentation at all... just visit their wiki! The Slampher is kind of a Sonoff RF that sits before any light bulb with an E27 screw....
Firmware over-the-air (OTA) is great. It makes you shiver whenever you throw an update to one of your devices. The ArduinoOTA library for ESP8266 is so easy to use it's almost magic. But once you have several devices deployed you start to think one step further. Here I'm going to talk about two different options: writing an automated deployment script that performs OTA updates or giving your device the ability to call home querying for new updates, downloading them and flash itself into the latest version available....
Yes, sure! You can buy a Sonoff RF and you are good to go, I guess. But I didn't and I was not so sure about the no-named RF receiver so I ended thinking about adding my own. But first things first. The Sonoff is an ESP8266 based smart switch by ITEAD which comes with custom firmware that communicates with the manufacturer cloud to provide “smart” capabilities like remote switching or scheduling....
