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Is it possible to connect to an SSID that does not require a password? My project using ESP8266-01 modules will sometimes be used in non-password protected guest networks.

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    yes, just skip the password. it works. Commented Jan 11, 2018 at 22:03

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Yes, it works! You can use:

WiFi.begin(ssid, NULL)

or even leave the passphrase empty, because it is optional:

WiFi.begin(ssid)

Reference: https://www.arduino.cc/en/Reference/WiFiBegin

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