Woks from Atom RUN but not when uploaded



  • Hi forum,
    I'm new and I'm testing for a research project a monitoring solution based on LoPy. So fa I have added two DS18B20 to the LoPy + PySense. The strage things is that when i run the code from the Pymkr in Atom it correctly read the DS18B20 temperatures, but when I upload the code on the LoPy the reading is None.

    Doe anyone have any idea or similar experience? Where should I look to start debugging?

    import time
    from lib.onewire import DS18X20
    from lib.onewire import OneWire
    
    ow1 = OneWire(Pin('P4'))
    ow2 = OneWire(Pin('P8'))
    time.sleep(1)
    temp1 = DS18X20(ow1)
    temp2 = DS18X20(ow2)
    while True:
    
        print("T1:",temp1.read_temp_async(temp1.roms[0]))
        time.sleep(1)
        temp1.start_conversion()
        time.sleep(1)
    
        print("T2:", temp2.read_temp_async())
        time.sleep(1)
        temp2.start_conversion()
        time.sleep(1)


  • It looks like it needs a double scan to find the rom.

    After inserting

    ow1 = OneWire(Pin('P4'))
    print('found devices:', ow1.scan())
    

    Even if the print is an empty array ('found devices:[]') then the temperature reading is working with appropriate rom...

    Anyone can get why?

    Maxi


 

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