One offered me an Arduino at Christmas.
I made my first step with it and understood the basics.
Today, i try to make it communicate via FBus with a Nokia (few or false documentation on this ... another problem).
And I noticed some unexpected voltage. Here is a summary:
- Arduino UNO rev 3
- Program loaded : blink example
- Measurement :
voltage between ground and TX pin : 4.6 V
voltage between ground and RX pin : 4.9 V
- LEDs : RX and TX are off
Is this normal ?
I mean, in serial communication, does a HIGH value is expected when nothing is communicated ?
Yes, that is the so called 'stop condition' for TTL level serial communications.
Thank you for your help, I will come with many more question after that I guess !