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NodeMCU ESP8266 in acsess point mode: the simpliest way to make Wi-Fi controlled Robot Car from Bluetooth Arduino Robot Car + Android App. In my project Smartphone Controlled Arduino 4WD Robot Car I presented a smartphone-controlled Arduino 4WD robot car or Bluetooth Arduino robot. Then I decided to make a Wi-Fi controlled robot car from a Bluetooth controlled one. For this purpose I simply removed Bluetooth module and added NodeMCU with the same wire connections (appropriate Andriod App was already created). The NodeMCU ESP8266 works in acsess point mode in order to control robot car in open air, where there is not working Wi-Fi network.”

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