Arduino Nano input voltage is specified as 7-9V. However, 5V USB works well.
My project uses 2 Arduinos communicating via I2C to split processing timing. Currently, I plug the prototype into 2 USB ports for power. I believe the power requirements are low enough to use 1 USB port. So, I'm trying to figure out how to simplify.
I have some micro USB ports on hand, so I was considering using that to split the output to the two Arduinos through the VIN pins. But then I remembered the input voltage requirement, which doesn't seem to make sense since USB is 5V.
So, I guess there are 2 questions: 1) Why can the USB port get away with 5V, where the VIN needs 7-9? 2) If you have general advice for powering my project, I would be happy to hear it.
I don't really feel like spending a lot of money or hassle to eliminate one wire, since I can fairly easily just plug in two USB cables. But, if simplifying is relatively easy/cheap, I'd like to.
Arduino Nano One
- Ulblox Neo 6m GPS
- 1 green LED @10mA
- 2x tm1637 4-digit displays
- inexpensive rotary encoder (assumption that current consumption is minimal)
Arduino Nano Two
- 8x WS2812B - never more than 1 color at once, so assume 20mA x8 = 160mA round to 200mA