hi, i am an electrical engineer and i have a great experience in designing electronic circuits like , analog circuits, microcontrollers etc. i have also designed a battery powered sensor device in which i used voltage, current, temperature, humidity, infrared, ultrasonic range sensors etc. your first two projects are very easy to design. Please contact me for further details and information.
Note: i will be available on freelancer from 10pm - 3am according to your ( GMT +8 ) time.
Thanks,
Rizwan