I flashed my ESP 8266 01 with NODE MCU, can I still use it with arduino hardware example as shield

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You need to have the AT command set firmware (and in the right location) to use the ESP as a WiFi adapter via a serial connection. AFAIK the NodeMCU and the AT command set are mutually exclusive. No problem: just reflash the ESP01. Read this thread for the details.

RD7

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