CircuitPython/interferometer at main · Pnguyenkhang/CircuitPython · GitHub

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# Trinket IO demo
# Welcome to CircuitPython! :)

import usb_hid
import board
from digitalio import DigitalInOut, Direction, Pull
from analogio import AnalogOut, AnalogIn
import touchio
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keycode import Keycode
import adafruit_dotstar as dotstar
import time
import neopixel
import math


# Analog input on D0
#analog1in = AnalogIn(board.D0)

PD1 = AnalogIn(board.A2)
PD2 = AnalogIn(board.A1)

# Analog output on D1
aout = AnalogOut(board.D1)


######################### HELPERS ##############################

# Helper to convert analog input to voltage
def getVoltage(pin):
    return (pin.value * 3.3) / 65536


######################### MAIN LOOP ##############################

i = 0
max_v_1 = 0
min_v_1 = 10000
max_v_2 = 0
min_v_2 = 10000
total = 0
Num_turns = 0
actual_angle = 0
actual_angle_2 = 0
# start w displacement
prev_angle = 0


while True:

    # Read analog voltage and get voltage readings on both pd1 and pd2
    v_2 = getVoltage(PD2)
    v_1 = getVoltage(PD1)

    # get maximum size
    if max_v_1 < v_1:
        max_v_1 = v_1

    # get minimum size
    if min_v_1 > v_1:
        min_v_1 = v_1

        # get maximum size
    if max_v_2 < v_2:
        max_v_2 = v_2

    # get minimum size
    if min_v_2 > v_2:
        min_v_2 = v_2

    # get new center
    center_x = (max_v_1 - min_v_1)/2
    center_y = (max_v_2 - min_v_2)/2

    x = v_1 - center_x
    y = v_2 - center_y

    curr_angle = math.atan2(y,x) * 180/math.pi
    print('curr',curr_angle)

    diff = curr_angle - prev_angle
    actual_angle = curr_angle
    # b/c pi to pi2
    if diff > 180:
        print("HI")
        actual_angle -= 2*math.pi
    if diff < -180:
        print("negative")
        actual_angle += 2*math.pi

    print('actual',actual_angle,'prev angle',prev_angle,'diff',diff, 'total',total)
    print((actual_angle,prev_angle))
    print(((actual_angle%360)/360)*65535)


    prev_angle = actual_angle
    # find # of turns
    Num_turns = actual_angle // 360
    print('number of turns:',Num_turns)

    actual_angle_2 += actual_angle + 33
    print(((actual_angle_2%360)/360)*65535)
    # plot graph
    #print((v_1,v_2, angle))
     # set analog output to 0-3.3V (0-65535 in increments)
    aout.value = int(((actual_angle_2%360)/360)*65535)

    time.sleep(0.5) # make bigger to slow down