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1

I used the same code provided by you and uploaded it in the arduino uno and it was working fine for me. I am attaching the image for reference. I guess there might be some other issue


2

Arduino allows you to connect external peripherals (via I2C, SPI, UART, I/O) and shields. It'll be impossible to list them all, as you can even make your own; but here an overview of the most common I can think off: WiFi Bluetooth LoRa Zigbee Z-wave RF (433mhz) InfraRed GSM/LTE It'll be a trade-off between signal range, power usage, delay and bandwidth. Do ...


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