Aide programme arduino Grove - 125KHz RFID Reader

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Bonjour a tous, pour un projet en cours je travaille sur le Grove - 125KHz RFID Reader Pour lire des badges

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Voici le programme en question :

/*
  link between the computer and the SoftSerial Shield
  at 9600 bps 8-N-1
  Computer is connected to Hardware UART
  SoftSerial Shield is connected to the Software UART:D2&D3
*/
 
#include <SoftwareSerial.h>
 
SoftwareSerial SoftSerial(2, 3);
unsigned char buffer[64];       // buffer array for data receive over serial port
int count = 0;                    // counter for buffer array
 
void setup()
{
    SoftSerial.begin(9600);     // the SoftSerial baud rate
    Serial.begin(9600);         // the Serial port of Arduino baud rate.
}
 
void loop()
{
    // if date is coming from software serial port ==> data is coming from SoftSerial shield
    if (SoftSerial.available())              
    {
        while(SoftSerial.available())               // reading data into char array
        {
            buffer[count++] = SoftSerial.read();      // writing data into array
            if(count == 64)break;
        }
        Serial.write(buffer, count);     // if no data transmission ends, write buffer to hardware serial port
        clearBufferArray();             // call clearBufferArray function to clear the stored data from the array
        count = 0;                      // set counter of while loop to zero
    }
    if (Serial.available())             // if data is available on hardware serial port ==> data is coming from PC or notebook
    SoftSerial.write(Serial.read());    // write it to the SoftSerial shield
}
void clearBufferArray()                 // function to clear buffer array
{
    // clear all index of array with command NULL
    for (int i=0; i<count; i++)
    {
        buffer[i]=NULL;
    }                  
}

Donc voila c'est celui la que je suis censé utiliser,source:Grove - 125KHz RFID Reader | Seeed Studio Wiki

Pour le branchement j'ai procédé comme suis:
Uart Mode
GND > GND
VCC > 5v
RX > RX
TX > TX

J'ai ça après la compilation:

Puis je téléverse , message derreur

Arduino : 1.8.1 (Windows 10), Carte : "Arduino/Genuino Uno"

C:\Users\Yaze\Documents\Arduino\sketch_apr03aa\sketch_apr03aa.ino: In function 'void clearBufferArray()':

C:\Users\Yaze\Documents\Arduino\sketch_apr03aa\sketch_apr03aa.ino:42:18: warning: converting to non-pointer type 'unsigned char' from NULL [-Wconversion-null]

         buffer[i]=NULL;

                  ^

Le croquis utilise 3210 octets (9%) de l'espace de stockage de programmes. Le maximum est de 32256 octets.
Les variables globales utilisent 363 octets (17%) de mémoire dynamique, ce qui laisse 1685 octets pour les variables locales. Le maximum est de 2048 octets.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xc8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xc8
Problème de téléversement vers la carte. Voir http://www.arduino.cc/en/Guide/Troubleshooting#upload pour suggestions.

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

Avez vous une idée?
Merci d'avance