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See attached my waveform of input to channel of ADS1115, my code, and my output that I am getting

I cannot get the output matplotlib waveform to plot smoothly like my input waveform from oscilloscope

Input frequency is 50Hz Code -

import matplotlib.pyplot as plt
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn
import board
import busio
import numpy as np
import time

i2c = busio.I2C(board.SCL, board.SDA)

ads = ADS.ADS1115(i2c,gain=1,data_rate=860)
ads.data_rate=860

Channel0 = AnalogIn(ads, ADS.P0)

times = []
voltages = []

start_time = time.time()

while True:
    current_time = time.time() - start_time
    voltage0 = Channel0.voltage 


    times.append(current_time)
    voltages.append(voltage0)

    plt.clf()
    plt.plot(times, voltages)
    plt.xlabel('Time (s)')
    plt.ylabel('Channel Voltage (V)')
    plt.title('Voltage over Time')
    plt.pause(0.005)

This is the input waveform:

Input Waveform

This is what I'm getting:

Output Waveform

I was expecting the output waveform to still have same sinusoidal output.

Improve this question
1
  • Matplotlib might not be fast enough for this kind of plotting. Instead, check out PyQtGraph Commented Jan 7 at 9:52
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