select an item by pictures and add it to invoice then print via Bluetooth printer or serial printer(RS-232).
Item price and quantity can change by touching more than 3 seconds in item picture. All item have a category. category example: vegetable, fruits. (Simple pos system). In the header, I can include two buttons and 0.00 label. So keep that space for that.
Hello I have experience with Bluetooth, GPS and other interfaces. I'd like to work on this project. Though the idea is not a 100% clear to me. Could you elaborate. Looking forward to hear from you. Thanks