When an Arduino project needs to communicate without wires — whether with a phone, the internet, or another nearby device — several wireless technologies are available, each striking a different balance between range, speed, and power consumption.
WiFi (ESP8266/ESP32)
Modules like the ESP8266 allow a direct connection to the internet over TCP/IP, with enough processing power to manage sensors independently and host full applications on the board itself, making it the ideal choice for IoT projects that need a constant network connection.
Bluetooth and BLE
Classic Bluetooth offers a speed of around 2.1Mbps, while the low-energy BLE version focuses on cutting power consumption enough to run a battery-powered device for a year or two, and it's built directly into smartphone operating systems, making it well suited to short-range manual control by the user.
ZigBee
Based on the IEEE 802.15.4 standard, it runs at about 250Kbps with a direct range of 10-100 meters, but extends further through mesh networking where devices relay the signal to one another. It suits home and industrial automation systems that need long battery life and a secure network.
GSM and RF radio frequencies
GSM modules like the SIM900 allow remote control via SMS messages, useful for projects like remotely opening a gate with no internet needed. Simple RF frequencies (315/433MHz) are the cheapest and lowest-power option, suited to short-range applications that don't need a complex network.
You can find WiFi, Bluetooth, ZigBee, and GSM modules compatible with Arduino at Juthour Tech.
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