It's possible to build a WIFI enabled gateway running directly on an ESP8266 module.
Installation and Calibration of Current Transformer for measurement of Power
The CH340 chip is used by a number of Arduino compatible boards to provide USB connectivity
The battery life (for a hypothetical temperature sensor) can be calculated by determining the average current for the circuit, using the following general equation:
In this section, you will learn the difference between Sensor, Repeater-sensor and Gateway.
The "Internet of Things" connects devices and vehicles using electronic sensors and the Internet.