I want to interface GLCD(more than 5 inch),Temperature sensor,Wifi module(ESP 8266), GSM module,SD card ,RTC for my IoT project. Can anyone suggest best board or processor for this project.
Also which is the good GSM module and wifi module.
Many components work on 5V or 3.3V only. Try to find modules that work with the same voltage, a mix will complicate your project. Then chose an Arduino for that voltage. A Pro Mini often supports either voltage, but not both at the same time. An Uno includes a 3.3V power line output, suitable for powering 3.3V sensors, but then logic level converters may be required to shift the signals between 5V and 3.3V.