Extension Explorer 16

= Description = In French: Création d'une carte d'extension pour la carte Explorer (PROJET: Carte Explorer 16 & Exos sur les uC).


 * V1: un montage permettra de simuler un carrefour routier, composer de 4 feux (RGB)

 in English: creation of one extansion board for the Explorer Board (see the links above)


 * V1: assembly will allow to simulate a crossroad (4 fires (RGB))

= Digram - Schematic =

= Part Calculation of Electronics Digram =

LED's for crossroad

 * the datasheet of the DSP implemented on the Explorer Board 16 (see pages 1 & 273) indicates that :
 * output current of I/O : I = 10mA
 * voltage I/O : VDD = 3.3V


 * 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
$$ R_{LED_R}=\frac{U_r}{I}=\frac{V_{DD}-U_{LR}}{I}=\frac{3.3V-1.8V}{10mA} $$ =  150 ohm  $$ P_{R_{LED_R}}=\frac{R_{LED_R}^2}{I}=\frac{150^{2}}{10mA} $$ =  15 mW  $$ R_{LED_O}=\frac{U_r}{I}=\frac{V_{DD}-U_{LO}}{I}=\frac{3.3V-1.9V}{10mA} $$ =  140 ohm  $$ P_{R_{LED_O}}=\frac{R_{LED_O}^2}{I}=\frac{140^{2}}{10mA} $$ =  14 mW 
 * calculation of resistance R_LED_R :
 * power dispersed by the resistance P_R_LED_R :
 * calculation of resistance R_LED_O :
 * power dispersed by the resistance P_R_LED_O :

$$ R_{LED_G}=\frac{U_r}{I}=\frac{V_{DD} - U_{LG}}{I}=\frac{3.3V-2.2V}{10mA} $$ =  110 ohm  $$ P_{R_{LED_G}}=\frac{R_{LED_G}^2}{I}=\frac{110^{2}}{10mA} $$ =  11 mW 
 * calculation of resistance R_LED_G :
 * power dispersed by the resistance P_R_LED_G :

Switch for crossroad

 * the datasheet of the DSP implemented on the Explorer Board 16 (see pages 1, 278, 279) indicates that :
 * output current of I/O : I_output = 10mA
 * input current of I/O : I_output max = 5mA
 * voltage I/O : VDD = 3.3V
 * leakage current of I/O : 2uA
 * low state ('0') in voltage : 0,2 * VDD

Formula
$$ VDD_{low} = VDD \cdot 0.2 = 3.3 \cdot 0.2 $$ =  0.66 V
 * voltage seens by the input of uC when it's a low state VDD_low :

$$ RIN_{low} = \frac{VDD_{low}}{I_L} = \frac{0.66}{2u} $$ =  330 kohms
 * Resitor seens by the input of uC when it's a low state RIN_low :

$$ R_{Pull-Up}_{low} = \frac{VDD - VDD_{low}}{I_L} = \frac{3.3 - 0.66}{2u} $$ =  1.32 Mohms
 * Resitor Pull-Up MAX :

= Layout =

= Components listing =

= Modification =

= Documentation =

PDF FILE

 * datasheet on the RED LED - AVAGO [[File:LED RED.pdf]]

required links

 * explication sur le calcul d'une résistance Push Pull
 * Doc PDF Datasheet DSPIC33FJxxx

= Contributor =
 * User:Philoux