Building up a new light Gantry for 1:32
Existing Gantry is using Race Corrdinator Analog A0 thru A4 for RED
New Gantry will use Race Corrdinator Analog A0 thru A4 for RED and A5 for Green
Existing LED's are wired with a series 220 ohm resistor (Arduino UNO spec at 20 mA). This probably is assuming the LED voltage drop is 2V and 3V across 220 ohm resisor gives approx 15mA. Make sesnse?
Proposed Gantry looks like this

Debating if I should use either;
1) two LED's in series with single resistor, logic from above would be resistor needs to be 68 ohms (2V per diode, 1V across resisot rat 15mA.
2) two LED's in parallel with a single resistor, logic from above would be resistor needs to be 100 ohms (2V LED, 3V Resisor at two 15mA for each LED).
Thoughts?
Existing Gantry is using Race Corrdinator Analog A0 thru A4 for RED
New Gantry will use Race Corrdinator Analog A0 thru A4 for RED and A5 for Green
Existing LED's are wired with a series 220 ohm resistor (Arduino UNO spec at 20 mA). This probably is assuming the LED voltage drop is 2V and 3V across 220 ohm resisor gives approx 15mA. Make sesnse?
Proposed Gantry looks like this
Debating if I should use either;
1) two LED's in series with single resistor, logic from above would be resistor needs to be 68 ohms (2V per diode, 1V across resisot rat 15mA.
2) two LED's in parallel with a single resistor, logic from above would be resistor needs to be 100 ohms (2V LED, 3V Resisor at two 15mA for each LED).
Thoughts?
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