# vMeterIXA_pico.py
#by: D@CC
#on: 2022FJun11
#Article: 180.html
#uSD: Fla53S

import machine
from machine import Pin,ADC
import time
# originally written for ePC Article 165 Mak Pi ADC
# MakPiADC board works on 2021FJun14
# CD0 is ADC0
# Pot is ADC1
#CDS0 & pot work if SW2 & SW3 are on

# modified (ver B) for ePC Article 180 RAPasc using ixProbe by D@CC
# to read pico ADC0 with ADC ixProbe attenuated by 9
# to be used with the INA219 to measure the Tx and Rx signals of a USB connector
#    refer to ePC Article 146 for more INA219 info

def RAPasc(nn,cvrsFactor):
    # RAPasc protocol means
    #    100 complex Readings from pico ADC nn with Periods in 7 bit asc (ascii)
    # see article 150 by D@CC for RAPasc
    
    # Purpose to return converted value of ADC0
    # in a special format of a complex number where
    #    the real part is the converted voltage
    # and the imaginary part is the UNIX time of the reading
    # see Article 165 MAK Pi ADC
    # version A works fine (it now has high input impedance as of 2022FJun09)
    #         A is used with a 10K0 and a 100k0 resistor to read 9% of actual voltage.
    #           This ensures that the ADC max input voltage is not exceeded.
    # if nn=1:
    #   returns value of ADCnn * cvrsFactor 
    #     plus dt as imaginary value
    #   if conversion factor ==1 then
    #     real component is returned as a hex value
    # if nn==0:
    #   returns value of ADC0 * (reading * cvrsFactor * ixProbe)
    ixProbe=9    #ixProbe attenuation is 9
    timeNow=time.time()
    strTime=str(timeNow)+".000"    
    if nn==0:
        #nn is 0  #ADC0
        strN0="0"
        strReading=str(readADC_pico(0)*ixProbe)
        print("|"+strReading+"|")
        strReading=strReading.strip()
        RAPreading="ADC"+strN0+":("+strReading+"+"+strTime+"j)"
        print(RAPreading)
    #if end
    return RAPreading

def readADC_pico(nn,cnvrt=5.035477e-05):
    #nn is the pico GPnn (ADCnn) to read
    # if cnvrt is absent:
    #   returns a value from 0 to 3v3
    # if cnvrt = 1
    #   returns the value read from 0 to 65535
    # if cnvrt = other
    #   returns a value in range 0 to other*65535
    #
    #cnvrt = 5.035477e-05 converts the reading to volts
    #          when the ixProbe is not used .
    # that is the default cnvrt factor.
    # next line is needed to remove pull-up resistor
    #   to produce a high-impedance input
    #   Source: forum.micropython.org/viewtopic.php?f=21&t=9959
    adcFirst =Pin(nn+26,Pin.IN)
    # create the ADC object
    adcFirst = machine.ADC(nn)
    # now read the ADC
    adcValue=adcFirst.read_u16()
    #print("The value of ADC0 is", adcValue)

    #conversion_factor = 3.3 / (65535)
    #print("conversion_factor:",conversion_factor)
    adcVoltage=adcValue * cnvrt
    #print("The voltage at ADC0 is", adcVoltage)
    #print("-bye- from readADC_pico.py")
    return adcVoltage
#def end
#                          main program starts here
progName="vMeterIXA_pico.py"
print("progName:",progName)
print(" by D@CC on 2022FJun10")
print()
#output is ADC0:(3.24738+1654827017.000j)  #ADC0: 3v3
#   Unix Time:1654827017 is Thu Jun 09 2022 22:10:17 UTC-0400 (EDST)
# ixProbe sensing pico pin 35 ADCref (atten:9)
#         green   pico pin 33 GND
#         yellow  pico pin 31 ADC0
#

#cvrsFactor=1.0000     #always 1.0000 in this program
ixProbe=10
# Will eventually prompt the user for the following:
#  n0     : to select ADC0
#  rCount : number of readings to gather
#  time0  : Unix time to start taking the first reading
#  dt     : time between readings
n0=0      #ADC number = 0 or 1 usually
dt = 1                #time interval

#if rCount == 0 : display ADC0 continuously
#          else : save the readings & times in a matrix
strN0=str(n0)
while True:
    timeNow=time.time()
    #eventually record the time in milliseconds
    # for now, just append ".000"
    strTime=str(timeNow)+".000"
    
    # process ADC0
    # next read ADC0 in volts (because parm2 is absent)
    # presume that a ixProbe with attenuation of 9 is being used
    vADC=readADC_pico(n0)*ixProbe
    strReading=str(vADC)
    #print("|"+strReading+"|")
    strReading=strReading.strip()  # there is no need for .strip() ????
    # RAPasc protocol means
    #    complex Reading from ADC with Periods in 7 bit asc (ascii)
    # see article 150 by D@CC
    strRAPasc="ADC"+strN0+":("+strReading+"+"+strTime+"j)"
    print(strRAPasc)
    
    print()   # print a blank line
    time.sleep(dt)  # 1 sec
#while end

    
#/vMeterIXA_pico.py     stored in Raspberry Pi Pico & pi/pico_4f31_on_Fla53