How to get 48 digital output pins on Raspberry Pi-3?

[Deo joseph]

Hi..
i am using Raspberry Pi3 board and i would like to control 48 electrical appliances (Fluorescent lamps)..so i need minimum of 48 digital output pins but board has got only 26 can anyone please help in this regard?

[KnarfB]

There are several "gpio expander" chips and boards around like this: http://www.pridopia.co.uk/pi-23017-4-lp.html.
SPI interface is easily chainable, so you can put several chips in series and increase the number of outputs to your like.
Keep in mind that the RasPi has 3.3V IO. hth Frank

[Deo joseph]

Thank you for the reply that was helpful..
One quick question..what is the maximum current i can source/sink on GPIO pins of Pi-3.
how much load it can take?
since i need 48 digital outputs how much current i can draw from each pin?

[Deo joseph]

OR in simple terms is Pi-3 powerful enough to drive 7 TPL7407L ICs ?
http://www.alldatasheet.com/datasheet-p ... 7407L.html

[scotty101]

No more than 16mA for a single pin and no more than 50mA across all the pins.

I (in)(ON) for the TPL7404L is only 10 micro amps so you should be ok.

[Deo joseph]

The information was helpful..Thank you for the Quick Replies..