D'après ce que j'ai compris, le condensateur entre sur le reset (normalement entre vcc et reset) permet d'empêcher que l'arduino redémarre lorsque l'on connecte le soft
"myFocuserPro2 comes with its own Windows Applications and ASCOM drivers. When connecting, the drivers attempt to restart the controller so it starts in a known state. If you wish to prevent this reset when the software connects to a controller, an optional power-on reset circuit is required.
The downside is that a switch must be used to disable the circuit. In normal operation, the switch is in the ON position. However, to reprogram the Nano with a firmware update, the switch must be moved to the OFF position before uploading the new firmware.
The advantage of NOT fitting the power on reset circuit is that the controller will always initialize to a known state when connection is made from the Windows app or ASCOM driver.
In general, the power-on reset that occurs when connecting to a myFocuserPro2 controller is not an issue when using the supplied Windows application or ASCOM driver. The reset takes about 2-3s before the controller is in a state to respond to any request.
However, some client applications expect a quick response and may generate a timeout error when attempting to connect to a myFocuserPro2 controller. If this is the case, then disabling or turning off the power-on reset circuit is the preferred option."
Oui, la CR10 à l'air top

avec un gros volume d'impression.