How does the Arduino board work?

Related questions

1. What is the maximum distance of the i2c bus?
2. How long will an Arduino run on a 9v battery?
3. What is the meaning of TX and FX?
4. Can you connect two Arduinos?
5. What is the difference between i2c and SPI and UART?
6. Can I supply 12v to Arduino?
7. What is a Tx signal?
8. What is the function of Arduino board?
9. What is Rx quality and its range?
10. What is wire H Arduino?

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13. #arduino
14. #hardware
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17. #electronics
18. #output
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20. #motor
21. #finger
22. #software