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5 years, 6 months ago.
4 digit 7 segment display without resistor
I am looking for the simpliest way to use a 4 digit 7 segment display with a NRF51822 ship.
The display could be one of this kind with common anode : http://www.hobbytronics.co.uk/arduino-4digit-7segment
I found on sparkfun that it is possible to drive this display without resistor by doing very small pulses on the output. The code is the following and thay say that "this technique is very common" : http://cdn.sparkfun.com/datasheets/Components/LED/_7Seg_Example.pde
Do you think it could be possible to do the same thing with a nrf51 ship? It looks interesting because you need nothing more than the display, but it seems tricky for me to adjust the pulse size in order not to have too much current in the display (and in the ship!).
Thanks in advance for your help