The error states that in line number 23 there is an incorrect indexing of array values from right hand side(rhs) to left hand side(lhs).

Hi Johirul,

As Lee says it is a little unclear as to your set up. I see from your code that it seems you are using a com port communications to your arduino. However at a glance may have trouble with timings, if your communicating a 10bit number this will take at least 2 bytes of data (16 bits) at a speed of 15kHz this will need a baud rate of >240,000 (bits/s) to prevent data pile up, which is getting into the high speed realms of the serial port. So you may want to look into a faster USB form of communication if real time data is needed at this speed, or consider having some in circuit data buffer such as a FIFO. (Not a fan of big software like matlab etc.) you might also consider dumping your data straight from the "com port" to a file (with something like Realterm), and analising the data later to ensure there is no chance of the PC causing a data bottle neck.

There is a similar application question here:

https://www.researchgate.net/post/Arduino_for_ECG

Hi Johirul.

you can write your code in arduino like this :

first_time = micros();

for (i=0;i