The new Rally Board 65 is an all-in-one portable video conference solution that combines audio and video in a 65-inch touchscreen display. The Rally Board 65 can be rolled around the office on a cart.

Assuming that it is used with a 10-MHz counter/timer, its resolution is roughly 10 µV per count ... or by U1 itself. Using a 555 in this self-resetting mode is unusual but is very handy here. This ...

While we power Arduino through a USB port, it bypasses the voltage regulator present on the Arduino Uno R4 Wi-Fi board, so we can consume current ... This function works inside the blink timer_loop ...