STM32PythonTest

import serial
import time
import matplotlib.pyplot as plt
from collections import deque


# Configure the serial connection to the correct port and baud rate
# For stm32, baud rate is typically 115200

ser = serial.Serial('COM5', 115200, timeout=1)

time.sleep(0.1)  # Wait for the connection to establish

# The deque is used to store the last 200 data points, but the 201st will remove the first
# This allows for the plot to show a moving window of data rather than just growing indefinitely
data = deque(maxlen=200)

# plt.ion allows for the plot to be updated dynamically
plt.ion()

# Sets up the figure for plotting

fig, ax = plt.subplots()

while True:
    # Read a line from the serial port, decodes from binary to string, and strips newline and spaces
    line = ser.readline().decode().strip()
    if line:
        print(line)

    # Attemps to convert the character string to an integer for plotting
    try:
        value = float(line)
    except ValueError as e:
        print("What??", e)
        continue

    # Updates the data array with the new value
    data.append(value)


    # Clears the previous plot and redraws with the updated data
    # It is plotting an array, so it will not be losing values, just shifting them
    ax.clear()
    ax.plot(data)
    # Sets the y-axis limits to 0-4V and x-axis limits to 0-200 samples
    ax.set_ylim(0, 4)
    ax.set_xlim(0, 200)
    ax.set_title('Voltage Readings from STM32')  
    ax.set_xlabel('Sample Number')
    ax.set_ylabel('Voltage (V)')
    # Pause briefly to allow the plot to update
    plt.pause(0.001)