I am trying to get a signal sampled by ADC interfaced with raspberry pi via Matlab. The code is as follows,
mypi = raspi i2cadc = i2cdev(mypi,'i2c-1','0x48') act_val=0; for i= 1:1:1000 writeRegister(i2cadc,1,hex2dec('C3E3'),'uint16'); %single shot 860fps (Config register) while (value ~= 50147) % wait until the MSB of conversion register has changed) [value]=readRegister(i2cadc,1,'uint16'); end [value1]=readRegister(i2cadc,0,'int16'); %(conversion register) act_val1(i)=value1; act_val(i)=(value1*4.096)/32767.0; end figure;plot(act_val1); figure;plot(act_val);
My input signal is 50 Hz sine, I have configured the ADS115 at 860fps and i am reading the signal from channel A0. The signal which is read from the conversion register is just some random noise rather than the actual signal. I don't know what is the problem with the code, but hardware wise the connections are intact and correct. Kindly let me know the issue with this code.