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hello everyone welcome to controllers
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tech today in this video we are going to
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interface joystick with stm32 I am using
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stm32 f-100 and three micro controller
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joystick can be used for the purpose of
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controlling the robot or a camera or
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anything else the output from the
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joystick is in the form of an analog
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signal and so we have to use the ADC to
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read this data here i am using channels
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1 & 2 of ADC 1 the pins used are a 1 and
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a 2 there is a little bit of setup needs
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to be done in the ADC first select the
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continuous conversion mode and enable it
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this is because we want the conversion
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to be taking place continuously next
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select the number of conversions as 2
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because we have two channels to do the
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conversion for ranked one is for channel
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1 and I have changed the sampling time
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to two hundred and thirty nine point
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five cycles to make the conversion
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fastest possible rank two is for channel
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two with same settings next thing we
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need to do is enable the DMA in circular
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mode this is important since in order to
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use multi channel we have to use DMA
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next I am going to connect four pins to
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the four LEDs to demonstrate the working
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of the joystick and so I am selecting
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these four pins as output the rest is
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Here I am creating an array of two
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variables to store the ADC result it
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must be a 32-bit unsigned integer
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because that's the argument of the ADC
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DMA function next we need to start a DC
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in DMA mode and the argument will be the
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array that we created above please note
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that do not write this inside the while
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loop write it before the while loop
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begins now let's compile it and flash in
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let me just quickly fix this one
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okay so the flashing is done now I will
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show you the result in the STM studio
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first go to the project folder in the
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debug folder open the dot e.l.f file
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now send both of these variables to the
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variable viewer and change it to the bar
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graph now notice the bar graph as I move
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the stick around note these values
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carefully especially the extreme values
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this is varying between 0 to 4095
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because the ADC and stm32 have 12 bit of
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resolution we will write our rest of the
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program based on these values
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in my case vr0 is connected to the VXR
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this is the case if the stick is in the
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middle then all the LEDs will be off
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rest we can write individual cases for
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each position turning on individual LEDs
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this is it guys I hope you enjoyed the
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video you can download the code from the
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link in the description keep watching
