from machine import DAC, TouchPad, Pin
import time
import math
import array

# ──────── SETTINGS ────────

TOUCH_THRESHOLD = 300  # Adjust per fruit/wire
DAC_PIN = 25  # Use GPIO 25 (DAC1), or 26 (DAC2)

# Frequencies for C major scale
frequencies = [262, 294, 330, 349, 392, 440, 494, 523]

# Touch input pins
touch_pins = [4, 15, 13, 12, 14, 27, 33, 32]

# ──────── INIT ────────

touch_sensors = [TouchPad(Pin(p)) for p in touch_pins]
dac = DAC(Pin(DAC_PIN))

sample_rate = 8000  # Hz

# ──────── SINE TABLE ────────

def make_wave(freq):
    samples = 100
    wave = array.array("B", [0] * samples)
    for i in range(samples):
        sine = math.sin(2 * math.pi * i / samples)
        wave[i] = int(127 + 127 * sine)  # 0–255 for DAC
    return wave, int(sample_rate / freq * samples)

# ──────── PLAYBACK ────────

def play_tone(freq, duration=0.25):
    wave, delay_us = make_wave(freq)
    t_end = time.ticks_add(time.ticks_ms(), int(duration * 1000))
    while time.ticks_diff(t_end, time.ticks_ms()) > 0:
        for val in wave:
            dac.write(val)
            time.sleep_us(delay_us)

# ──────── MAIN LOOP ────────

while True:
    for i in range(8):
        touch_val = touch_sensors[i].read()
        if touch_val is not None and touch_val < TOUCH_THRESHOLD:
            play_tone(frequencies[i], 0.3)
            time.sleep_ms(100)  # debounce
    time.sleep_ms(20)