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everyone welcome to controllers tech
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in this video we will cover how to
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interface rotary angle sensor with stm32
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this here is the rotary angle sensor and
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to digital converter it works like a
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so the resistance changes with rotation
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and we get a variable voltage at the
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it have four pins round vcc
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and signal the third pin is not
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we will use the reading from it and
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angle by which the shaft has been
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let's start by creating the project with
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by the time the id loads let's see the
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details about this rotary angle
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as we can see here the sensor can rotate
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here they have a sample code it is an
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arduino code but it's simple to
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let's go through it here first of all we
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next convert this value to the voltage
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and using this voltage find the angle
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that's all as i said it's pretty simple
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now let's create the project in cube id
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choose your device here
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give some name to this project and click
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first of all i am selecting external
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crystal for the clock
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as this sensor works with adc i am
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we will keep using 12 bits for the adc
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here we will enable the continuous
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that's all for the adc setup now let's
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i have 8 megahertz external crystal and
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i want the system to run at 180
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click save to generate the project
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let's see the connection once
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vcc is connected to 3.3 volts
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ground to ground and the signal pin
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is connected to the pin pa-1 the channel
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let's start our program now
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first of all we will define a variable
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that can store the adc
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value next define the voltage
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and the angle variables
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to read the data from adc we will use
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the pole for conversion method
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so first start the adc
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poll for the conversion to finish
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read the value and store in the variable
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and finally stop the adc
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now we will convert this a-d-c value to
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the respective voltage
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here 4095 is used because i am using 12
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bit resolution in adc
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and 3.3 volts is the reference voltage
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after getting the respective voltage we
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will convert this to the angle
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here 300 is the maximum angle and
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3.3 volts is the supply to the sensor
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let's give a delay of 10 milliseconds in
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change the type here to float let's
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we don't have any errors so let's debug
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i have added all the three variables to
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let's run it as you can see the values
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as i rotate the potentiometer the angle
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the maximum angle is 300 degrees
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now it start reducing
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and we are back to zero
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this working is very simple as the
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this is it for this video i will try to
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where this sensor can be used to control
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the position of the stepper motor
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i hope you understood the video leave
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comments in case of any doubt
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you can download the code from the link
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keep watching and have a nice day ahead
