Reading 7 external voltages

Projects General Guidance
10 
int16_t adc0, adc1, adc2, adc3, adc4, adc5, adc6;

adc0 = ads.readADC_SingleEnded(0);
adc1 = ads.readADC_SingleEnded(1);
adc2 = ads.readADC_SingleEnded(2);
adc3 = ads.readADC_SingleEnded(3);
adc4 = ads.readADC_SingleEnded(4);
adc5 = ads.readADC_SingleEnded(5);
adc6 = ads.readADC_SingleEnded(6);

float fadc0, fadc1, fadc2, fadc3, fadc4, fadc5, fadc6;

fadc0 = adc0 * 0.1875;

You really, really need to learn to use arrays. Otherwise your entire sketch is going to be 7 times longer than it should be!

For example the above can be shortened to

int16_t adc[7];

for (byte c=0; c<7; c++) adc[c] = ads.readADC_SingleEnded(c);

float fadc[7];

for (byte c=0; c<7; c++) fadc[c] = adc[c] * 0.1875;