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hello everyone welcome to the IOT
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section of controllers tech today in
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this video we will see how to use stm32
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to log data to the things speak server
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using esp8266 let's first start by
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creating the project in cube IDE I am
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using nuclear 4 4 6 ar e for this
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project give some name and click finish
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here is our cube M X first I am
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selecting external crystal for the clock
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next I am selecting an ADC which will be
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used to read the potentiometer data
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changing the resolution to ten bits
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even if you don't enable continuous
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conversion it should be fine
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because I am going to use the pole for
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conversion method so continuous
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conversion is not required leave
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everything else to default now enable
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the UART with interrupt this is where
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the esp8266 will be connected let's set
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up the clock now I have eight megahertz
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crystal and I want the system to run at
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click Save to generate the project
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let's include the library's first I am
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going to use the ring buffer library and
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data logger library put the source and
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the header files in the respective
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folders click refresh and you can see
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the files here in our project let's take
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a look at the ring buffer dot C file
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here you can change the UART
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that you are using copy this function
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from here and paste it in the interrupt
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dot C file also we need to modify our
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UART Handler and comment out the
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let's take a look at the data logger dot
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ESP in it takes the SSID and password as
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the parameter ESP send data sends the
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data to a particular filed label the
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parameters are self-explanatory here
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here you have to give the label of the
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field such as either 1 or 2 or 3 etc
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this is the one I am going to use it
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sends data to multiple fields at once
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let's first go to the things speak
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register yourself or log in click on
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channels then click new channel give
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some name to this channel I am going to
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use for fields in this channel
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we can modify these names also I will
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quickly modify others too
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you can see the modified names remember
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that field label number is the one that
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we need while sending data let's start
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include the data logger dot H I will
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write a function to get the ADC value
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this includes start a DC pole for
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conversion get the value and stop a DC
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let's define the variables that we are
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also a buffer to stall the four values
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inside the main function
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first of all initialize the ESB with the
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SSID and password now in the while loop
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we will get the value of ADC then
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convert this value to the voltage
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and at last increment the count variable
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now we will store these values in the
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respective position in value buffer
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and send these values to the sever now
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here we need the API key go to your
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channel click API key and copy write API
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key I have for number of fields so enter
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4 here and pass the value buffer give a
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delay of 15 seconds minimum things feed
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server will not update the data if we
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send it within 15 seconds
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let's build and debug our program
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I am adding the variables in the live
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you can see the first entry in the
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things speak now I am rotating the
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potentiometer so the ADC value will
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you can see the new entries now also
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note the values of count and count times
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everything is as par with the values we
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have in the live expression
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this data will keep updating every 15
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this is it for the video guys this
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program uses the 80 commands so any ESP
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module that supports 80 commands will
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work you can download the code from the
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link in the description be safe and have
