I have a SD card working with a LoRa device and a LCD, and the sd card generates a file but it cannot open it to write in it. Here goes the code:
#include <LiquidCrystal_I2C.h>
#include <SPI.h>
#include <LoRa.h>
#include <SD.h>
File myFile;
//#include <SdFat.h>
//
//SdFat sd;
//SD myFile;
// LCD
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 16 column and 2 rows
// LoRa
#define txPower 20
#define spreadingFactor 11
#define signalBandwidth 500E3
#define codingRateDenominator 4
#define preambleLength 6
const byte longitud = 15; //nombre de bytes que llegeix Node
char data[10][longitud];
bool flag_comm_Serial = false, flag_comm_LoRa = false;
int send_tries = 5; //intents d'enviament missatge activacio flash
uint32_t t0 = 0;
uint16_t print_period = 900;
void setup()
{
//pinMode(4, OUTPUT);
//pinMode(4, OUTPUT);
//spiSelect(10);
lcd.init(); // initialize the lcd
lcd.backlight();
Serial.begin(9600);
while (!Serial);
Serial.println("LoRa Receiver");
LoRa.setPins(10, 9); //Pins Ares placa //nss,nreset
lcd.print("LoRa Receiverr");
// delay(2000);
lcd.clear();
if (!LoRa.begin(433E6)) {
Serial.println("Starting LoRa failed!");
lcd.print("LoRa Failed");
// delay(2000);
lcd.clear();
while (1);
}
LoRa.setTxPower(txPower);
LoRa.setSpreadingFactor(spreadingFactor);
LoRa.setSignalBandwidth(signalBandwidth);
LoRa.setCodingRate4(codingRateDenominator);
LoRa.setPreambleLength(preambleLength);
LoRa.enableCrc();
// SD
pinMode(4, OUTPUT);
//spiSelect(4);
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("initialization failed!");
while (1);
}
Serial.println("initialization done.");
if(!SD.exists("test.txt"))
{
myFile = SD.open("test.txt", FILE_WRITE);
if (myFile) {
Serial.println("Archivo nuevo, Escribiendo encabezado(fila 1)");
myFile.println("Tiempo(ms),Sensor1,Sensor2,Sensor3");
myFile.close();
} else {
Serial.println("Error creando el archivo datalog.csv");
}
}
}
void loop()
{
char a;
byte c;
//delay(2000);
//lcd.print("Inside Loop");
//Serial.print("Inside Loop");
//delay(2000);
//lcd.clear();
// try to parse packet
//spiSelect(10);
int packetSize = LoRa.parsePacket();
if (packetSize) {
//delay(2000);
//lcd.print("Dintre Parse");
//delay(2000);
//lcd.clear();
// received a paket
Serial.print("Received packet '");
// read packet
while (LoRa.available()) {
for(byte i = 0; i < 10; i++){
a = LoRa.read();
c = 0;
while (a != ',' and c < longitud - 2){
data[i][c] = a;
a = LoRa.read();
c++;
}
data[i][c] = ' ';
c++;
while(c < longitud){
data[i][c] = '\0';
c++;
}
}
}
lcd.clear(); // clear display
lcd.setCursor(0, 0);
lcd.print(data[0]); // stage
Serial.println(data[0]);
lcd.setCursor(0, 1);
lcd.print(data[1]); // altitude
Serial.println(data[1]);
lcd.setCursor(0, 2);
lcd.print(data[1]); // altitude
Serial.println(data[1]);
lcd.setCursor(0, 3);
lcd.print(data[1]); // altitude
Serial.println(data[1]);
//SD
//spiSelect(4);
myFile = SD.open("test.txt", FILE_WRITE); // open the file for reading
if (myFile) {
Serial.print("Escribiendo SD: ");
int a = int(data[0]);
int b = int(data[1]);
int c = int(data[1])+1;
myFile.print("Tiempo(ms)=");
myFile.print(millis());
myFile.print(", sensor1=");
myFile.print(a);
myFile.print(", sensor2=");
myFile.print(b);
myFile.print(", sensor3=");
myFile.println(c);
myFile.close(); //cerramos el archivo
Serial.print("Tiempo(ms)=");
Serial.print(millis());
Serial.print(", sensor1=");
Serial.print(a);
Serial.print(", sensor2=");
Serial.print(b);
Serial.print(", sensor3=");
Serial.println(c);
} else {
Serial.println("Error al abrir el archivo");
}
// spiSelect(10);
delay(900);
lcd.clear();
// delay(2000);
}
//digitalWrite(4,HIGH);
//spiSelect(4);
// delay(2000);
}
void spiSelect(int CS)
{
digitalWrite(10,HIGH);
digitalWrite(4,HIGH);
digitalWrite(CS,LOW);
}
If I try the following code for the sd alone it works:
type or paste code#include <SD.h>
File myFile;
void setup()
{
Serial.begin(9600);
Serial.print("Iniciando SD ...");
if (!SD.begin(4)) {
Serial.println("No se pudo inicializar");
return;
}
Serial.println("inicializacion exitosa");
if(!SD.exists("datalog.csv"))
{
myFile = SD.open("datalog.csv", FILE_WRITE);
if (myFile) {
Serial.println("Archivo nuevo, Escribiendo encabezado(fila 1)");
myFile.println("Tiempo(ms),Sensor1,Sensor2,Sensor3");
myFile.close();
} else {
Serial.println("Error creando el archivo datalog.csv");
}
}
}
void loop()
{
myFile = SD.open("datalog.csv", FILE_WRITE);//abrimos el archivo
if (myFile) {
Serial.print("Escribiendo SD: ");
int sensor1 = analogRead(0);
int sensor2 = analogRead(1);
int sensor3 = analogRead(2);
myFile.print(millis());
myFile.print(",");
myFile.print(sensor1);
myFile.print(",");
myFile.print(sensor2);
myFile.print(",");
myFile.println(sensor3);
myFile.close(); //cerramos el archivo
Serial.print("Tiempo(ms)=");
Serial.print(millis());
Serial.print(",sensor1=");
Serial.print(sensor1);
Serial.print(",sensor2=");
Serial.print(sensor2);
Serial.print(",sensor3=");
Serial.println(sensor3);
} else {
// if the file didn't open, print an error:
Serial.println("Error al abrir el archivo");
}
delay(100);
}here
And this is my error:
However, the file is created but remains empty
