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Bluetooth Arduino second try HC-05 [SOLVED]

Buying a HC-05 module solved the issue. https://www.devobox.com/el/bluetooth/738-hc-05-serial-bluetooth-module-for-arduino-gr.html?search_query=bluetooth+&results=33 HC-05 Serial Bluetooth module (for Arduino) Input voltage: 3.6-6V Working current: matching for 30 mA, matching the communication for 10 mA Output Power Class: Class 2 Size: 43mm x 15mm HC-05 is READ MORE

HM-10 Serial Bluetooth 4.0 module (for Arduino)

NodeMCU 3V3 to HM-10 VCC NodeMCU GND to HM-10 GND NodeMCU D5 to HM-10 TX NodeMCU D6 to HM-10 RX Arduino Bluetooth Controller (HM-10 Module) https://play.google.com/store/apps/details?id=com.argonremote.bluetoothcontroller&hl=en https://www.instructables.com/id/ESP8266-HM-10-IBeacon-Proximity/ https://gist.github.com/karesztrk/a2e479d69985a7e9e4f8c6ba0f765ede