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Topic: Super Bright Red Led - BC547B Transistor, but which Resistors? (Read 3 times) previous topic - next topic

WilliamK Govinda

:-p

Too bad I don't have those. But I will see if the local shop carries it... (doubt it)

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

WilliamK Govinda

Sounds interesting, but how can I do that? Do you mind teaching me, pretty please? ;-) ;-)

WilliamK Govinda

Can't I just use 2 x ULN2803 chips and 8 pins on the Arduino? (I don't need many free pins, only 4 for a multiplexer, and 2 for UART)

CrossRoads

I thought you wanted 16 non-multiplexed LEDs?
Connect up the 74HC595 & ULN2803 like I show at the bottom of this schematic.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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