I am working on university project so we are making a portable heater the dimension of the heater are in cylindrical diameter 80mm x 100mm height. you will be required to create circuit connection diagram and find the item to make this project work. control board to have the following connection on the board, (display screen, to show temperature, battery life, for example Raspberry Pi would be good to be used to control this heater). the heater will be powered by battery power source 20 volts and 4 amps, the controller must have input point to recharger the battery, outgoing ports to connect LED light for exterior design light, also speaker for user to be able to blue tooth music. user must be capable to increase heat or decrease by simply increasing the voltage or decreasing it that will effect the coil. I am also looking for any suggestion because we have small dimension to work with to make this project work.