@dnear1 said in Fipy issues with IF statements: ') Cleaned up and comments added import os import math from machine import UART uart = UART(1, 9600) # init with given baudrate uart.init(9600, bits=8, parity=None, stop=1) # init with given parameters #while True: # data = uart.readall() # if data is not None: # print(data) while 1: data = uart.readall()# get everything from the serial buffer if data is not None:#make sure it's not an empty buffer bytestream=data.split(b'BM')[1][0:31]# HPMA sends 32 byte packets that start with \x42\x4D ('BM') if len(bytestream)==30:#check that we actually got 30 bytes (excluding the data we split out) if bytestream[0:2]==b'\x00\x1c':#HPMA packet is always 28 data bytes(excluding start header and checksum) checksum=143#since split command removed the \x42\x4D, add them back to get correct checksum validated=0 for i in range(0,28): checksum+=bytestream[i]#cycle thru the data values and add them up validated=int(bytestream[28])*256+int(bytestream[29])#read checksum bytes from packet and make them a 2-byte integer if checksum==validated:# both values should match, else we have a corrupt packet pm25=int(bytestream[4])*256+int(bytestream[5])#these two bytes represent the particulate detected that's 2.5um large pm10=int(bytestream[6])*256+int(bytestream[7])#these two bytes represent the particulate detected that's 10um large print('pm2.5 = ',pm25) print('pm10 = ',pm10) else: print('checksum failed') else: print('invalid packet length') else: print('incomplete packet')

@robert-hh Sorry for the late and Thanks for your reply. I have tried with simple change like adding if statement with particular device address but it's not working. Is there any other possible way ?

@spacelggo PIL is designed for Python 2.x and not supported on MicroPython. Also much of it's functionality relies on native low level libraries we don't have. There are plans to to offer image manipulation functions but I can't offer a date at this point.