What I'm doing:
I am reading 288 individual (pixels) values off a CMOS sensor, and writing these values to the serial port.
What I want to do:
Read the 288 individual values from the CMOS sensor, get the average of each 288 pixel over 50 read cycles and then write the average values to the serial port.
How the sensor program works
Set the ST pin high for x amount of time to indicate the integration time, when it is pulled low, integration time has stopped and you can read from the sensor. The code:
#define SPEC_ST A1
#define SPEC_CLK A2
#define SPEC_VIDEO A3
#define PIXELS 288 // 288 pixel values
uint16_t data[PIXELS];
void setup(){
//Set desired pins to OUTPUT
pinMode(SPEC_CLK, OUTPUT);
pinMode(SPEC_ST, OUTPUT);
Serial.begin(115200); // Baud Rate set to 115200
digitalWrite(SPEC_ST, HIGH);
}
// This functions reads the data from the CMOS sensor
void readSpectrometer(){
int delayTime = 1; // delay period
// Start clock cycle for 30 us [Ignore time taken to execute digitalWrite ~ 100us]
for(int i = 0; i < 15; i++){
digitalWrite(SPEC_CLK, HIGH);
delayMicroseconds(delayTime);
digitalWrite(SPEC_CLK, LOW);
delayMicroseconds(delayTime);
}
//Set this pin low to finish integration time, prepare to read from sensor
digitalWrite(SPEC_ST, LOW);
//Read from SPEC_VIDEO, 1 pixel per clock cycle
for(int i = 0; i < SPEC_CHANNELS; i++){
data[i] = analogRead(SPEC_VIDEO);
digitalWrite(SPEC_CLK, HIGH);
delayMicroseconds(delayTime);
digitalWrite(SPEC_CLK, LOW);
delayMicroseconds(delayTime);
}
//Reading from sensor complete, set back to high to re-initialize integration time
digitalWrite(SPEC_ST, HIGH);
// The function below prints out data to the serial port
void printData(){
for (int i = 0; i < PIXELS; i++){
Serial.print(data[i]);
Serial.print(',');
}
Serial.print("\n");
}
void loop(){
readSpectrometer();
printData();
delay(1);
}
Yes, the code works and the read out works as well, tested with oscilloscope and spectral sources.
To run the code, it’s a bit more involved than setting ST low and high. It includes more
clock cycling. But, this version is a simplified snippet, more code wouldn’t provide any value or insight to the goal at hand ! Sensor
Hahah, technically this code doesn’t work with the sensor. It doesn’t need to, the programmatic solution can be reached without “working” code.
OK, here is an example of adding up ten readings from analog input A0, and calculating the average.
float x=0;
for (int i=0; i<10; i++) {
x += analogRead(A0);
}
x = x/10.0;
Don't count on this approach working with an ordinary Arduino, because they aren't fast enough to interface with that sensor. The "non working" snippet that you posted violates the sensor clock timing requirements, as well.
No, it is not. You have an analogRead() in there. On an Arduino Uno, that defaults to 110 us. But then, you forgot to tell us what Arduino you are using, and to post ALL the code.
Also, digitalWrite() takes about 4 us on an Uno.
This comment is completely wrong:
// Start clock cycle for 30 us [Ignore time taken to execute digitalWrite ~ 100us]
Gotcha! Well thanks for the feedback, I posted the simplest code. I’m running this on a black pill different data acquisition technique, whatever. This post has gotten completely derailed anyways, I’m not asking for advice on DAQ - all I was asking is how to get running averages in the readspec function lol.
!