Ramarsri, I have listed the top colleges for BTech/ BE in Mechatronics engineering in Tamil Nadu below:

• SRM Institute of Science and Technology, Chennai
• Sathyabama Institute of Science and Technology, Chennai
• Hindustan Institute of Technology and Science, Chennai
• Kumaraguru College of Technology, Coimbatore
• Thiagarajar College of Engineering, Madurai
• Shanmugha Arts Science Technology Research and Academy, Thanjavur
• Bannari Amman Institute of Technology, Erode
• Karunya Institute of Technology and Sciences, Coimbatore
• Sri Krishna College of Engineering and Technology, Coimbatore
• Bharath Institute of Higher Education and Research, Chennai

For more details on these colleges like admission process, fee structure, eligibility, etc you can visit: https://engineering.careers360.com/colleges/list-of-be-btech-in-mechatronics-engineering-colleges-in-tamil-nadu