Dear Employer,
I watched the video you attached. You have explained the requirements very clearly and I understood it well.
I have more than four years of experience doing Arduino, Java, Android, Python, and other projects. I can surely provide you a quality solution for this stepper motor project.
I invite you for the discussion. Please share any missing details.
And ya, don't worry about the bid price. I will edit it to match the best with your requirements.
Waiting for your reply.