hi there,
i am doing my FYP as to build a portable barcode scanner. and i plan to modify a barcode scanner to interface to 18f452 Pic and display in lcd.
my problem is i cant even supply power to turn on my barcode scanner: the scanner i used has a ps2 connector and require a 5v Vcc and operating current 100mA. however, when i connect a 9v battery and with a 5v regulator to my scanner, it cant be turn on and the voltage across will decrease to less than 3v.
so i am suspecting the current supply doesnt enuf, so i connect a 5v adapter plug with 2A current to my scanner, it still cant be turn on.
and the only way to turn it on is by connecting it to cpu ps2 port. then it can turn on normally even i only connect two pin in the ps2 port which is Vcc and GND pin.
i believe if any other "portable" way to turn on a keyboard with ps2 port will jus be the same way to turn on a ps2 port barcode scanner other than connect to cpu.
anyone have any idea regarding this, pls, i am desperate for help and advises. tyvm
pls welcome to put in any related post's link regarding my project including programming discussion on barcode. tyvm
i am doing my FYP as to build a portable barcode scanner. and i plan to modify a barcode scanner to interface to 18f452 Pic and display in lcd.
my problem is i cant even supply power to turn on my barcode scanner: the scanner i used has a ps2 connector and require a 5v Vcc and operating current 100mA. however, when i connect a 9v battery and with a 5v regulator to my scanner, it cant be turn on and the voltage across will decrease to less than 3v.
so i am suspecting the current supply doesnt enuf, so i connect a 5v adapter plug with 2A current to my scanner, it still cant be turn on.
and the only way to turn it on is by connecting it to cpu ps2 port. then it can turn on normally even i only connect two pin in the ps2 port which is Vcc and GND pin.
i believe if any other "portable" way to turn on a keyboard with ps2 port will jus be the same way to turn on a ps2 port barcode scanner other than connect to cpu.
anyone have any idea regarding this, pls, i am desperate for help and advises. tyvm
pls welcome to put in any related post's link regarding my project including programming discussion on barcode. tyvm