![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/04\/ESP32-Wi-Fi-Multi.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nUsing WiFiMulti in your ESP32 IoT projects is useful if your board can have access to more than one Wi-Fi network. Implementing this feature in your projects is very simple and improves your projects significantly.<\/p>\n\n\n\n
ESP32 with WiFiMulti<\/h2>\n\n\n\n
You can easily add WiFiMulti to your ESP32 projects with just a few lines of code. You can find an example in your Arduino IDE. With an ESP32 board select (Tools > Board), go to File <\/strong>> Examples <\/strong>> WiFi <\/strong>> WifiMulti<\/strong>. <\/p>\n\n\n\n Here are the essential steps to use WiFiMulti with the ESP32.<\/p>\n\n\n\n First, you need to include both WiFi.h<\/span> and WiFiMulti.h<\/span> libraries.<\/p>\n\n\n\n Then, you need to create a WiFiMulti<\/span> object:<\/p>\n\n\n\n Then, in the setup()<\/span>, use the addAp()<\/span> method on the wifiMulti<\/span> object to add a network. The addAP()<\/span> method accepts as arguments the network SSID and password. You should add at least one network.<\/p>\n\n\n\n Finally, connect to Wi-Fi using the run()<\/span> method. You can also print a message in case the Wi-Fi is disconnected.<\/p>\n\n\n\n You can run this snippet on the loop()<\/span> section and if the ESP32 gets disconnected from a Wi-Fi network, it will automatically try to connect to the next strongest network on the list.<\/p>\n\n\n\n For you to understand how WiFiMulti works with the ESP32, we created a simple example that does the following:<\/p>\n\n\n\n To test this, you can copy the following code to your Arduino IDE. It is based on the WiFiScan<\/a> and WiFiMulti <\/a>examples provided in the Arduino core examples for the ESP32.<\/p>\n\n\n View raw code<\/a><\/p>\n\n\n\n Don’t forget to add a list of networks on the following lines. You can multiply those lines to add more networks.<\/p>\n\n\n\n Note: <\/strong> if you want to test this project, but at the moment, you only have access to one network, you can create a hotspot with your smartphone and add the hotspot name and password to the list of available networks. I tested this with my iPhone and it worked perfectly (you may need to remove spaces and special characters from the hotspot name<\/strong>).<\/p>\n\n\n\n After adding a list of networks to your code, you can upload it to your ESP32.<\/p>\n\n\n\n Open the Serial Monitor at a baud rate of 115200 and press the ESP32 RST button to restart the board.<\/p>\n\n\n\n First, it will show a list of nearby networks and corresponding RSSI. In my case, I have access to the first and third networks. In my case, the ESP32 connects to the iPhone network which is the strongest on the list (an RSSI closer to zero means a stronger signal).<\/p>\n\n\n\n If I remove the iPhone hotspot, the connection will be lost and it will connect to the next strongest network on the list.<\/p>\n\n\n\n In this tutorial, you learned how to use WiFiMulti with the ESP32 to add a list of networks that the ESP32 can connect to. It will connect to the network with the strongest signal (RSSI). If it loses connection with that network, it will automatically try to connect to the next network on the list.<\/p>\n\n\n\n We hope you find this tutorial useful. We have other tutorials related to Wi-Fi functions with the ESP32 that you may find useful:<\/p>\n\n\n\n Learn more about the ESP32 with our resources:<\/p>\n\n\n\n Thanks for reading.<\/p>\n","protected":false},"excerpt":{"rendered":" Learn how to use WiFiMulti with the ESP32. It allows you to register multiple networks (SSID\/password combinations). The ESP32 will connect to the Wi-Fi network with the strongest signal (RSSI). … <\/p>\nInclude Libraries<\/h3>\n\n\n\n
#include <WiFi.h>\n#include <WiFiMulti.h><\/code><\/pre>\n\n\n\nWiFiMulti Object<\/h3>\n\n\n\n
WiFiMulti wifiMulti;<\/code><\/pre>\n\n\n\nAdd List of Networks<\/h3>\n\n\n\n
wifiMulti.addAP(\"ssid_from_AP_1\", \"your_password_for_AP_1\");\nwifiMulti.addAP(\"ssid_from_AP_2\", \"your_password_for_AP_2\");\nwifiMulti.addAP(\"ssid_from_AP_3\", \"your_password_for_AP_3\");<\/code><\/pre>\n\n\n\nConnect to Wi-Fi<\/h3>\n\n\n\n
if(wifiMulti.run() != WL_CONNECTED) {\n Serial.println(\"WiFi not connected!\");\n delay(1000);\n}<\/code><\/pre>\n\n\n\nESP32 with WiFiMulti Example<\/h2>\n\n\n\n
\/*\r\n * Based on the following examples:\r\n * WiFi > WiFiMulti: https:\/\/github.com\/espressif\/arduino-esp32\/blob\/master\/libraries\/WiFi\/examples\/WiFiMulti\/WiFiMulti.ino\r\n * WiFi > WiFiScan: https:\/\/github.com\/espressif\/arduino-esp32\/blob\/master\/libraries\/WiFi\/examples\/WiFiScan\/WiFiScan.ino\r\n * Complete project details at our blog: https:\/\/RandomNerdTutorials.com\/\r\n * \r\n *\/\r\n\r\n#include <WiFi.h>\r\n#include <WiFiMulti.h>\r\n\r\nWiFiMulti wifiMulti;\r\n\r\n\/\/ WiFi connect timeout per AP. Increase when connecting takes longer.\r\nconst uint32_t connectTimeoutMs = 10000;\r\n\r\nvoid setup(){\r\n Serial.begin(115200);\r\n delay(10);\r\n WiFi.mode(WIFI_STA);\r\n \r\n \/\/ Add list of wifi networks\r\n wifiMulti.addAP("ssid_from_AP_1", "your_password_for_AP_1");\r\n wifiMulti.addAP("ssid_from_AP_2", "your_password_for_AP_2");\r\n wifiMulti.addAP("ssid_from_AP_3", "your_password_for_AP_3");\r\n\r\n \/\/ WiFi.scanNetworks will return the number of networks found\r\n int n = WiFi.scanNetworks();\r\n Serial.println("scan done");\r\n if (n == 0) {\r\n Serial.println("no networks found");\r\n } \r\n else {\r\n Serial.print(n);\r\n Serial.println(" networks found");\r\n for (int i = 0; i < n; ++i) {\r\n \/\/ Print SSID and RSSI for each network found\r\n Serial.print(i + 1);\r\n Serial.print(": ");\r\n Serial.print(WiFi.SSID(i));\r\n Serial.print(" (");\r\n Serial.print(WiFi.RSSI(i));\r\n Serial.print(")");\r\n Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*");\r\n delay(10);\r\n }\r\n }\r\n\r\n \/\/ Connect to Wi-Fi using wifiMulti (connects to the SSID with strongest connection)\r\n Serial.println("Connecting Wifi...");\r\n if(wifiMulti.run() == WL_CONNECTED) {\r\n Serial.println("");\r\n Serial.println("WiFi connected");\r\n Serial.println("IP address: ");\r\n Serial.println(WiFi.localIP());\r\n }\r\n}\r\n\r\nvoid loop(){\r\n \/\/if the connection to the stongest hotstop is lost, it will connect to the next network on the list\r\n if (wifiMulti.run(connectTimeoutMs) == WL_CONNECTED) {\r\n Serial.print("WiFi connected: ");\r\n Serial.print(WiFi.SSID());\r\n Serial.print(" ");\r\n Serial.println(WiFi.RSSI());\r\n }\r\n else {\r\n Serial.println("WiFi not connected!");\r\n }\r\n delay(1000);\r\n}\r\n<\/code><\/pre>\n\twifiMulti.addAP(\"ssid_from_AP_1\", \"your_password_for_AP_1\");\nwifiMulti.addAP(\"ssid_from_AP_2\", \"your_password_for_AP_2\");\nwifiMulti.addAP(\"ssid_from_AP_3\", \"your_password_for_AP_3\");<\/code><\/pre>\n\n\n\nESP32 with WiFiMulti Demonstration<\/h2>\n\n\n\n
![\"WiFiMulti](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/04\/WiFi-Multi-Demonstration.png?resize=601%2C661&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n![\"WiFiMulti](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/04\/WiFi-Multi-Demonstration-2.png?resize=601%2C397&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nWrapping Up<\/h2>\n\n\n\n