The ESP8266 has in built single channel ADC that can measure between 0V and 1V with 10 bit resolution. To read higher voltages you need external voltage divider. ADC is available on ESP12.
Resistor voltage dividers are commonly used to create reference voltages, or to reduce the magnitude of a voltage so it can be measured. Continue reading ESP8266 reading ADC data
ESP8266 have 512 bytes of internal EEPROM, it is useful when you want to store some settings, such as IP address of server, WEP key, SSID of WiFi.
In this lesson we will see writing data to EEPOM and reading from EEPROM
To write byte to EEPROM we need two commands Continue reading Internal EEPROM ESP8266
Software serial uses timer, be careful when you are using software serial. Timer is also used for WiFi communication section if you don’t give enough time to WiFi routines it will create problem of stack error or misbehavior. It is better to use software serial only when you need two serial ports and also avoid use of software serial for data reception.
Most cases we need to interface 5V (TTL) logic level devices with ESP8266. For this you can simple use 1N4148 diode and one pull-up resistor.
The above circuit working can be understood using below figure.
For serial interface you have two options go with 3.3V USB to Serial converter or use above circuit to do level conversion and use 5V serial converter.
Serial interface is required to program the ESP flash.
ESP8266 require a sequence of input to enter into programming mode when programming is done using Arduino IDE. With few external components.