import time
import board
import busio
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn

# --- ADS1115 setup ---
i2c = busio.I2C(board.SCL, board.SDA)
ads = ADS.ADS1115(i2c)

# Gain: start conservative so we don't saturate
# If everything looks tiny, change to ads.gain = 4 or 8 later.
ads.gain = 1

# Channels
a0 = AnalogIn(ads, ADS.P0)             # single-ended A0
a1 = AnalogIn(ads, ADS.P1)             # single-ended A1
d01 = AnalogIn(ads, ADS.P0, ADS.P1)    # differential A0 - A1

print("Quickcheck: shows A0, A1, D01(A0-A1) in mV + a simple movement meter.")
print("Tip: DON'T touch bare wires. Stretch belt 5-10 times. Ctrl+C to stop.\n")

prev = None
ema = 0.0  # smoothed movement
alpha = 0.2

while True:
    v0 = a0.voltage
    v1 = a1.voltage
    vd = d01.voltage

    # movement based on differential (best signal if it's a differential sensor)
    if prev is None:
        prev = vd
    move = abs(vd - prev)
    prev = vd
    ema = (1 - alpha) * ema + alpha * move

    # bar graph (auto-scales roughly)
    bar_len = min(60, int(ema * 2000))  # tweak multiplier if too sensitive/insensitive
    bar = "#" * bar_len

    print(
        f"A0={v0*1000:7.1f}mV  A1={v1*1000:7.1f}mV  D01={vd*1000:7.1f}mV  move={ema*1000:6.2f}mV |{bar}",
        end="\r",
        flush=True
    )
    time.sleep(0.05)