I’m a beginner and i want to make a project using esp8266 and it is wifi based. What is the range of esp8266 using wifi communication to cellphones? And how to extend uts range?
If you’re using Blynk then the ESP8266 doesn’t talk directly to the mobile device.
Instead it talks to your router via WiFi, and your router talks to the Blynk server across the internet.
Your mobile device also talks to the Blynk server across the internet, from wherever it happens to be in the world, and whatever communication network is available (WiFi, GSM etc).
ESP8266 and ESP32 based devices only use 2.4GHz WiFi, so provided your home WiFi network’s 2.4GHz network extends to wherever your ESP based device is located then it should work fine. If you need to extend your home network then you can do that using regular WiFi technology.
You can monitor the RSSI signal strength from your ESP device to tell you how strong the WiFi signal is.
I have a number of devices that report a signal strength as low as -85 dBm and still work reliably.
Some devices, like the ESP8266 based Wemos D1 Mini Pro allow an external antenna to be used, which can boost the effective working range.
Pete.