Multi Channel High Sampling Rate ADC

Other Hardware Sensors
1

Hi everyone
I am using Arduino Mega2560 to acquire audio signals from 2 channels (A0 and A1). The default sampling rate seems to be around 4 kHz. When I try to read two channels( with the analogRead function) the sampling rate reduces to half per channel. I want to use both channels with at least 16ksPs. How can I achieve this?
Can you provide me with sample codes?
Here is my code :

void loop() {

int j=0;
    for(int i=0;i<900;i+=4)
    {
      sense_val=analogRead(sensor_pin);
      sense_val2=analogRead(sensor_pin2);

      d_t_s[i]=sense_val>>8;
   
      d_t_s[i+1]=sense_val&0b0011111111;

      d_t_s[i+2]=sense_val2>>8;

      d_t_s[i+3]=sense_val2&0b0011111111;}

      client.write((const uint8_t *)d_t_s,900);
 
}
2

Max rate is just under 10 ksps - for all channels together.

Solution: get an external ADC that can reach your required sampling rate.

By the way, how do you plan to deal with all that data?

3

Actually I was able to increase sampling rate by setting the relevant bitd of the register ADCSRA with appropriate values.
But, thank you!

4

True, you can increase the rates quite a bit but you will be losing precision (you go down to 9 or 8 significant bits).

5

What are you trying to actually do?

6

consider using an arduino-due
for example, have a look at this topic Re: how to get the 1Msps in Due

7

I am trying to sample 2 separate signals with maximum frequency of 4kHz and then send them to computer via ethernet. I want to do this as fast as possible. Also, is there any way that I can get conversion results from two channels using interrupt?

8

merdogan:
is there any way that I can get conversion results from two channels using interrupt?

Yes