Hi, I am going to start a masters thesis in mechatronic engineering soon, what is something innovative I can do? 

I like microcontrollers, I would like to do something sciency but it can't take more than month to make instruments and gather data.
That is very vague! Do you have a topic yet? Or a focus? I would start there! There’s a lot of exciting stuff you can do with micro-controllers. Can be something that measures a physical phenomenon in your house (like temperature) with an arduino to something larger where you’re measuring distance and distance of objects like how I believe roombas (the robotic vacuums) do that. It can also be used in the medical field for measuring data, I am not super knowledgeable about this, but I know some people that have done projects along those lines.
I like your idea about measuring data in the medical field. I know it's a bit vague, but can you please elaborate a bit more about ideas in that direction? If it can also involve some theory that would be awesome!
Microcontrollers are small computer chips that are used to control and monitor various devices and systems. They are ideal for use in the medical field as they can help in measuring important medical data such as heart rate, blood pressure, body temperature, and more.

For example, wearable devices such as fitness trackers and smartwatches use microcontrollers to monitor heart rate, steps taken, and other physical activity. In the medical field, this technology can be used to track vital signs and alert healthcare providers if there are any changes that need to be addressed.

Another example is the use of microcontrollers in medical equipment such as insulin pumps. These pumps can monitor blood sugar levels and adjust insulin doses as needed. This helps to keep blood sugar levels in a safe range and reduces the risk of health complications.

In summary, microcontrollers play a crucial role in measuring important medical data and can help improve patient outcomes by monitoring vital signs and alerting healthcare providers if needed.