=== 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}{I} = \frac{150 o}{10mA}</math> = ''' 15 mW '''
* calculation of resistance R_LED_O <math>\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.9V}{10mA}</math> = ''' 140 ohm '''
* power dispersed by the resistance R_LED_O <math>\frac{R_LED_O}{I} = \frac{140 o}{10mA}</math> = ''' 14 mW '''
= Layout =