Hello, my objective is to perform ADC operation by using MCP3008 chip in Arduino Mega 2560 Board and then write the ADC value into a .csv file with timestamp by using Gobetwino application.
Currently, I able to perform ADC operation as well as able to write ADC value into a .csv file by Gobetwino. However, my problem is it only produce 1 sample per second only in .csv file since my desired result is 100 samples per second or 1000 samples per second. How can I control or increase the sampling rate so that I can captures more samples in one second?
Thanks you very much and appreciate for helping. Hereby I attached my previous Arduino coding as shown in below.
// This sketch demonstrates the use of the Gobetwino commandtypes LGFIL and CPFIL
#include <SPI.h>
#define SELPIN 53 //Selection Pin
#define DATAOUT 51//MOSI
#define DATAIN 50//MISO
#define SPICLOCK 52//Clock
int readvalue;
byte clr;
int serInLen = 25;
char serInString[25];
int logValue1=0;
int logValue2=0;
int logValue3=0;
int logValue4=0;
int logValue5=0;
int logValue6=0;
int logValue7=0;
int logValue8=0;
int result;
void setup()
{
pinMode(SELPIN, OUTPUT);
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK, OUTPUT);
//disable device to start with
digitalWrite(SELPIN,HIGH);
digitalWrite(DATAOUT,LOW);
digitalWrite(SPICLOCK,LOW);
// Setup serial comm. Initialize random function.
Serial.begin(9600);
//randomSeed(analogRead(0));
// delay(5000);
// Use the CPTEST copy file command to make a copy of a new empty logfile
Serial.println("#S|CPTEST|[]#");
readSerialString(serInString,1000);
// There ought to be a check here for a non 0 return value indicating an error and some error handeling
}
void loop()
{
//Create some random values to log to a file on the PC. This could be sensor readings or whatever
//but for this example it's just 3 random values
logValue1= read_adc(1);
logValue2= read_adc(2);
logValue3= read_adc(3);
logValue4= read_adc(4);
logValue5= read_adc(5);
logValue6= read_adc(6);
logValue7= read_adc(7);
logValue8= read_adc(8);
logData(logValue1,logValue2,logValue3,logValue4,logValue5,logValue6,logValue7,logValue8);
delay(500);
}
// Send the LOGTEST command to Gobetwino the 3 random values are seperated by semicolons
void logData( int value1, int value2, int value3, int value4, int value5, int value6, int value7, int value8)
{
char buffer[5];
Serial.print("#S|LOGTEST|[");
Serial.print(", ");
Serial.print(itoa((value1), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value2), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value3), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value4), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value5), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value6), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value7), buffer, 10));
Serial.print(", ");
Serial.print(itoa((value8), buffer, 10));
Serial.println("]#");
readSerialString(serInString,1000);
// There ought to be a check here for a non 0 return value indicating an error and some error handeling
}
//read a string from the serial and store it in an array
//you must supply the array variable - return if timeOut ms passes before the sting is read
void readSerialString (char *strArray,long timeOut)
{
long startTime=millis();
int i;
while (!Serial.available()) {
if (millis()-startTime >= timeOut) {
return;
}
}
while (Serial.available() && i < serInLen) {
strArray[i] = Serial.read();
i++;
}
}
int read_adc(int channel) //functiion prototype for Read ADC
{
int adcvalue = 0;
byte commandbits = B11000000; //command bits - start (B7) , mode (B6), channel (B3 to B5), dont care (B0 to B2) Note: B1 (1st bit // LSB) ; B7 (8th bit //MSB) (Channel refer to datasheet)
//allow channel selection
commandbits|=((channel-1)<<3); // must put "|" (not one "1" symbol)
digitalWrite(SELPIN,LOW); //Select adc
// setup bits to be written
for (int i=7; i>=3; i--){
digitalWrite(DATAOUT,commandbits&1<<i); // correct instruction Note: it means commandbits & (1<<i), do "1<<i" first.
//digitalWrite(DATAOUT,HIGH); //cannot use this instruction
//cycle clock
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
}
digitalWrite(SPICLOCK,HIGH); //ignores 2 null bits
digitalWrite(SPICLOCK,LOW);
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
//read bits from adc since it is ADC is 10 bits, then int i=9; i>=0; i-- ; if ADC is 12 bits, then nt i=11; i>=0; i--
for (int i=9; i>=0; i--){
adcvalue+=digitalRead(DATAIN)<<i;
//cycle clock
digitalWrite(SPICLOCK,HIGH);
digitalWrite(SPICLOCK,LOW);
}
digitalWrite(SELPIN, HIGH); //turn off device
return adcvalue;
}
