from machine import Pin, Timer
import time

# Read the analog inputs
# Use timer interrupts to set the sampling rate to 100Hz
# Send the results to a file Readme.txt on the PICO chip
# Convert A/D reding to Volts

p16 = Pin(16, Pin.OUT)
led = Pin(17, Pin.OUT)
tim = Timer()
N = 0
flag = 0
def tick(timer):
    global led
    global N
    global flag
    flag = 1
    N += 1
    led.toggle()
    

# 100Hz for 2 seconds
tim.init(freq=100, mode=Timer.PERIODIC, callback=tick)

a2d0 = machine.ADC(0)
a2d1 = machine.ADC(1)
a2d2 = machine.ADC(2)
a2d3 = machine.ADC(3)
a2d4 = machine.ADC(4)
conversion_factor = 3.3 / (65535)

file1 = open("readme.txt", "w")

pin = Pin(15,Pin.IN,Pin.PULL_UP)

# N = number of samples
N = 0
Nmax = 200
print('Collecting ', Nmax, ' samples')

while (N < Nmax):
    if (flag == 1):
        p16.value(1)
        a0 = a2d0.read_u16() * conversion_factor
        a1 = a2d1.read_u16() * conversion_factor
        a2 = a2d2.read_u16() * conversion_factor
        a3 = a2d3.read_u16() * conversion_factor
        a4 = a2d4.read_u16() * conversion_factor
        # print(a2)

# formatted outout: fixed decimal places
        file1.write(str(N) + " ")
        file1.write(str("%8.5f"%a0) + " ")
        file1.write(str("%8.5f"%a1) + " ")
        file1.write(str("%8.5f"%a2) + " ")
        file1.write(str("%8.5f"%a3) + " ")
        file1.write(str("%8.5f"%a4))
        file1.write("\n")
        p16.value(0)
        flag = 0

p16.value(0)
led.value(0)    
file1.close()
print("Sampling Complete")