* the datasheet of the red LED (see pages 3) indicates that :
** conduction voltage : ULR = VF = 1.8V
** average current : I = 20mA
* the datasheet of the orange LED (see pages 3 / 4 & / 5) indicates that : ** conduction voltage : ULO = VF = 1.9V
** average current : I = 30mA
* the datasheet of the green LED (see pages 3 / 4 / 5) indicates that :
** conduction voltage : ULG = VF = 2.2V
** average current : I = 30mA
=== Formula ===
* calculation of resistance R_LED_R <math>\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.8V}{10mA}</math> = ''' 150 ohm '''
* power dispersed by the resistance R_LED_R <math>\frac{R_LED_R^{2}}{I} = \frac{150 o^{2}}{10mA}</math> = ''' 15 mW '''
* calculation of resistance R_LED_O <math>\frac{U_r}{I} = \frac{VDD - U_{LRLO}}{I} = \frac{3.3V - 1.9V}{10mA}</math> = ''' 140 ohm '''* power dispersed by the resistance R_LED_O <math>\frac{R_LED_O^{2}}{I} = \frac{140 o^{2}}{10mA}</math> = ''' 14 mW ''' * calculation of resistance R_LED_G <math>\frac{U_r}{I} = \frac{VDD - U_{LG}}{I} = \frac{3.3V - 2.2V}{10mA}</math> = ''' 110 ohm '''* power dispersed by the resistance R_LED_O <math>\frac{R_LED_O^{2}}{I} = \frac{110 o ^{2}}{10mA}</math> = ''' 11 mW '''
= Layout =