In lesson 03 I discussed how to compute for the current-limiting resistors to be used. R4 has a max current of 8mA per pin. I used 1k ohm resistor per LED. You can even use a bigger value resistor but the LED will be a bit dimmer.
@@joedgohHi joedgoh, the pre assembled traffic light unit (the one with the larger LEDS) looks like it has 330ohm smd resistors built in to the unit, by my calculations (5v - 2v / 330) the current flow would be around 9-10ma which is greater than what the Arduino R4 pins can handle, would you suggest using another 330ohm resistor wired in series for each LED? Thanks 🤩 ❤
