checkpoint_3_3.py

from webiopi.devices.analog import MCP3208
import pylab
import numpy as np

x = [0.0]*100
y = [0.0]*100

hi_arr = [0.0]
low_arr = [0.0]

hi_0 = 2.84
low_0 = 0.320

hi = 2.20
low = 0.880

ADC0 = MCP3208(chip = 0)

print("Analog Channel Count {0}").format(ADC0.analogCount())
print("Analog Bit Resolution  {0}").format(ADC0.analogResolution())
print("Analog Maximum {0}").format(ADC0.analogMaximum())
print("Analog Reference Voltage {0}").format(ADC0.analogReference())

for i in range(100):
  y[i] = ADC0.analogReadVolt(3)
  x[i] = i + 1

  if (y[i] > hi/2.0):
    hi_arr.append(y[i])
  else:
    low_arr.append(y[i])
  print("[{0}]  {1}").format(x[i], y[i])

hi_mean = np.mean(hi_arr)
low_mean = np.mean(low_arr)
print("Mean\n{0}  {1}").format(hi_mean, low_mean)

v_adc = [0.447, low_mean, hi_mean, 2.90]
v_osc = [low_0, low, hi, hi_0]

pylab.plot(v_osc, v_adc)
pylab.xlabel('Measured Voltage (Volts)')
pylab.ylabel('ADC Voltage (Volts)')
pylab.title('Bit Resolution vs Sample No. for square wave')
pylab.grid(True)
pylab.savefig("sample_3_3.pdf")
pylab.show()