Building a USB Charging Device
$10-30 USD
Paid on delivery
I would like to build a USB charging device which is based on a Lithium Ion Battery (Multiple [url removed, login to view] UltraFire Cells). The device should contain a charging protection circuit, a 5V 3A DC Converter and a current limiter circuit (2A and 1A).
Furthermore, the circuit will need to some connections to an Attiny Microcontroller to check the battery voltage and to display it through one RGB Led. In terms of the Microcontroller you will not need to code anything. Just the raw circuit board designs are required.
Due the fact that I am currently a student in Electrical Engineering I would also like to know how the resistors, capacitors and other components were chosen and calculated. No full explanations will be required, but if I have a short question I would like to get an answer to it.
Project ID: #6382464
About the project
Awarded to:
Hi! I'm embedded developer with 5 years in programming and 10 years in electronics. I also can write simple code for microcontroller without additional payment.
3 freelancers are bidding on average $192 for this job
