Hi rozijusoh,
I have more than 5 yrs of experience in designing customized Embedded systems using PIC controllers in the field of Power, Communication, Metering and Control. As you said, you are a science teacher, i think this will be used to teach students, so i will do the job in very low price.
Please let me know if you have decided to use any specific controller and sensor for the job.
Looking forward to working on this project with you.
Thank you.
Regards,
Tushar