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karoui2
karoui2
Visitor II
December 22, 2013
Question

implement a one wire with UART to extarct data from DHT11 sensor

  • December 22, 2013
  • 2 replies
  • 796 views
Posted on December 22, 2013 at 18:04

Hi,

as the title shows I have to implement one wire using UART to extract data from DHT11 sensor. Can any body gives me an example of using the DHT11 sensor with stm32f4 baord. thanks in advance

#1-wire #lmgtfy
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    2 replies

    Andrew Neil
    Andrew Neil
    Super User
    December 23, 2013
    Posted on December 23, 2013 at 11:49

    http://www.lmgtfy.com?q=DHT11

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Andrew Neil
    Andrew Neil
    Super User
    December 24, 2013
    Posted on December 24, 2013 at 08:55

    As noted here

    https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/DispForm.aspx?ID=8725&RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Discovery/STM32F0%20-%20USART%20receiving%20only%20first%20package%20of%20data&Source=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder%3D%252fpublic%252fSTe2ecommunities%252fmcu%252fLists%252fSTM32Discovery%252fSTM32F0%2520%252d%2520USART%2520receiving%2520only%2520first%2520package%2520of%2520data%26FolderCTID%3D0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F%26TopicsView%3Dhttps%253A%252F%252Fmy%252Est%252Ecom%252Fpublic%252FSTe2ecommunities%252Fmcu%252FLists%252FSTM32Discovery%252FAllItems%252Easpx%26currentviews%3D63

    Might it not be easier to bit-bang the protocol using GPIO than try to kludge the UART...?

    A quick look at the

    datasheet suggests that this ''1-wire'' interface may not be a million miles from the well-established Maxim/Dallas 1-Wire TMprotocol - to it might be worth looking to their examples, etc, for support...?

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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