Arduino Mega2560R3 timout error

Arduino : 1.8.18 (Windows 10), Carte : "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

Le croquis utilise 2968 octets (1%) de l'espace de stockage de programmes. Le maximum est de 253952 octets.

Les variables globales utilisent 35 octets (0%) de mémoire dynamique, ce qui laisse 8157 octets pour les variables locales. Le maximum est de 8192 octets.

avrdude: ser_open(): can't open device "\.\COM3": Acc�s refus�.

avrdude: ser_drain(): read error: Descripteur non valide

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: ser_send(): write error: sorry no info avail

avrdude: stk500_send(): failed to send command to serial port

avrdude: ser_recv(): read error: Descripteur non valide

avrdude: stk500v2_ReceiveMessage(): timeout

avrdude: stk500v2_getsync(): timeout communicating with programmer

Une erreur est survenue lors du transfert du croquis

Ce rapport pourrait être plus détaillé avec
l'option "Afficher les résultats détaillés de la compilation"
activée dans Fichier -> Préférences.

I see you are using a rather old version odf the IDE (1.8.18). What is the version of the AVR boards library you are using?

If you disconnect the board, does COM3 disappear from the IDE (and Windows device manager)?

What does Windows device manager think of your board?

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