'''
 flash: adafruit-circuitpython-raspberry_pi_pico-en_US-7.0.0.uf2

 from adafruit-circuitpython-bundle-7.x-mpy-20211011.zip copy ( to /lib/) :

 adafruit_display_text
 adafruit_bus_device
 adafruit_register
 adafruit_ssd1306.mpy
 adafruit_framebuf.mpy

 from https://github.com/adafruit/Adafruit_CircuitPython_framebuf/blob/main/examples/font5x8.bin
 copy font5x8.bin
 to / near code.py

 adafruit_dht.mpy

'''

import time
import board
print("________ Hallo World")
print(dir(board))

import digitalio
import supervisor
import microcontroller
import adafruit_dht

from analogio import AnalogIn
analog_in0 = AnalogIn(board.A0) # GP26 pin 31
analog_in1 = AnalogIn(board.A1) # GP27 pin 32
analog_in2 = AnalogIn(board.A2) # GP28 pin 34
print("________ analogio lib loaded / A0 GP26 pin 31 / A1 GP27 pin 32 / A2 GP28 pin 34")

def get_volt(pin):
    return (pin.value * 3.3) / 65536

def get_pct(pin):
    return (pin.value * 100.0) / 65536

print("________ switch PICO on board LED")
myled = digitalio.DigitalInOut(board.LED)
myled.direction = digitalio.Direction.OUTPUT
myled.value = True
time.sleep(2)
myled.value = False
time.sleep(2)
myled.value = True
#time.sleep(2)

print("________ dht-library loaded")
dhtDevice = adafruit_dht.DHT22(board.GP7)
print("________ data at GP7 pin 10 ")

print("________ try OLED")
import adafruit_ssd1306
import busio as io

# GP1 PICO pin2 I2C0 SCL // GP0 PICO pin1 I2C0 SDA
# i2c = io.I2C(scl=board.GP1,sda=board.GP0)
# this works from Circuit Python, but want change to DEFAULT PINS!
# GP5 PICO pin7 I2C0 SCL // GP4 PICO pin6 I2C0 SDA
i2c = io.I2C(scl=board.GP5,sda=board.GP4)

#RuntimeError: No pull up found on SDA or SCL; check your wiring
# use 10k to 3v3 each

# ,addr=0x3d #ValueError: No I2C device at address: 3d
#( for 128*64 OLED? )
oled = adafruit_ssd1306.SSD1306_I2C(128,32,i2c,addr=0x3c )
oled.fill(1)
#oled.show
#time.sleep(2)

#oled.pixel(10,0,0)
#oled.pixel(10,1,0)
#oled.pixel(10,2,0)
#oled.pixel(10,3,0)
#oled.pixel(10,4,0) # now i see that black line
oled.show()
# got first time the OLED to lit up ( and stay as long USB power )
print("________ see OLED white screen")
time.sleep(5)

oled.fill(0)
#from adafruit_display_text import label

oled.text('Line1: PICO OLED',0,0,1)
oled.text('Line2: 0123456789',0,11,1)
oled.text('Line3: qwertyuiop[]',0,22,1)
print("________ see OLED black screen with white 3 lines text")

oled.show()
time.sleep(3)

print("________ so far so good")

# make a DHT sensor function

valid = 0
invalid = 0
noskip = False #______________________________ we assume we come from a one sec flag but for DHT need a two sec sampling
diagprint = True #____________________________ as parameter for function details

def get_dht(diagprint):
    global valid
    global invalid
    global dhtT
    global dhtH
    global noskip

    #_________________________________________ local filter tuning
    fA = 0.8 #________________________________ use old value
    fB = 1.0-fA #_____________________________ sum must be 1.0

    if ( noskip ):
        try:
            newT = dhtDevice.temperature
            newH = dhtDevice.humidity
            valid += 1
            if (diagprint):
                print("valid: {}, newT: {}, newH: {}".format(valid, newT,newH) )
            dhtT = dhtT*fA + newT*fB
            dhtH = dhtH*fA + newH*fB
            noskip = False
        except:
            invalid += 1
            if (diagprint):
                print("invalid: {}".format(invalid) )

    else: # wait one more sec loop
        noskip = True

#_____________________________________________________ globals
loop = True
inval = 'p'
lastsec = 0
inow = 0
measure = False
dhtT =-1.0
dhtH =-1.0

#___________________________________________ MAIN
print("________ start main measuring loop")

while loop:
    if ( measure ):
        measure = False #___________________ reset until main loop find new second
        get_dht(diagprint) #________________ every 2 secs only and filtered to dhtT and dhtH, with (diagprint)
        print("DHT22: Temperature:{0:5.1f} [C], Humidity:{1:5.1f} [%]".format( dhtT, dhtH ) )
        oled.fill(0)
        oled.text('DHT22 test, filtered',0,0,1)
        oled.text('T:{0:5.1f}C H:{1:5.1f}%'.format(dhtT,dhtH),0,11,1)
        oled.text('later',0,22,1)
        oled.show()

    inow = time.time() #____________________ sec after 1.1.1970
    if ( inow > lastsec ):
        lastsec = inow
        measure = True #____________________ seconds flag

#___________________________________________ END