Aug 21, 2017  Now, upload the below program in your Arduino UNO and open the serial monitor. As discussed earlier you have to rotate the potentiometer to control the rotation of the Stepper motor. Rotating it in clockwise will turn the stepper motor in clockwise direction and vice versa. Hope you understood the project and enjoyed building it. To help us achieve this we will be using the AccelStepper library developed by ‘Mike McCauley‘ which enable us to control up to 10 steppers at the same time if we want. In this Part 1 we will look at the code that will control the stepper motor and how to use the Serial Monitor to send values to the Arduino to move the steppers.

1. Arduino Stepper Motor Circuits

I would like to send data from python do arduino in order to control motors via relays. Idea is to send a number, in order to identify a motor and a value, to finally move it. Unfortunately im struggling with some problems. Data is getting lost.

So, in this minimal example there is an identifier 'n', to indicate that the received data is the variable 'number' and an identifier 'c' to identify that the received data is a counter. To find out what's wrong, I send the data back to Python and try to read it. This is setup is only working for the first to characters. All other data is getting lost.

Can someone give me a hint? Are those identifiers necessary? Do I have to put some delay(), or maybe another baut-rate?

I guess it's something about the second identifier. The setup is working fine, if I only work with the 'counter' for example.

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Arduino Stepper Motor Circuits

Thank you very much in advance!

Pyhton:

Arduino:

Sorry! Here is my sample-run:(I'm confused, why there are additional blank-lines, beside the print() in the output)

1 Answer

Thanks for the support. So, finally no data did get lost ;) The problem was: Arduino is creating a blank-line, when sending data back. so 'ser.readline()[:-2].decode()' solved this issue. I run into another problem, when sending integers bigger than 9. In order to do so, one has to split the integer into separated chars and encode them. Here is my workaround:

Python:

Arduino:

And the final output:

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