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

Cross Light Part

• 

  Schema Feux Tricolores - Kicad

• 

  bloc H1 - General - Orcad

• 

  bloc H2 - Cross Light part - Orcad

LEDS DISPLAY FIXME

A venir !!!

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

• calculation of resistance R_LED_R :

$R_{LED_R}=\frac{U_r}{I}=\frac{V_{DD}-U_{LR}}{I}=\frac{3.3V-1.8V}{10mA}$ = 150 ohm

• power dispersed by the resistance P_R_LED_R :

$P_{R_{LED_R}}=\frac{R_{LED_R}^2}{I}=\frac{150^{2}}{10mA}$ = 15 mW

• calculation of resistance R_LED_O :

$R_{LED_O}=\frac{U_r}{I}=\frac{V_{DD}-U_{LO}}{I}=\frac{3.3V-1.9V}{10mA}$ = 140 ohm

• power dispersed by the resistance P_R_LED_O :

$P_{R_{LED_O}}=\frac{R_{LED_O}^2}{I}=\frac{140^{2}}{10mA}$ = 14 mW

• calculation of resistance R_LED_G :

$R_{LED_G}=\frac{U_r}{I}=\frac{V_{DD} - U_{LG}}{I}=\frac{3.3V-2.2V}{10mA}$ = 110 ohm

• power dispersed by the resistance P_R_LED_G :

$P_{R_{LED_G}}=\frac{R_{LED_G}^2}{I}=\frac{110^{2}}{10mA}$ = 11 mW

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

• voltage seens by the input of uC when it's a low state VDD_low :

$VDD_{low} = VDD \cdot 0.2 = 3.3 \cdot 0.2$ = 0.66 V

• Resitor seens by the input of uC when it's a low state RIN_low :

$RIN_{low} = \frac{VDD_{low}}{I_L} = \frac{0.66}{2u}$ = 330 kohms

• Resitor Pull-Up MAX :

$R_{Pull-Up_{max}} = \frac{VDD - VDD_{low}}{I_L} = \frac{3.3 - 0.66}{2u}$ = 1.32 Mohms

Remark : the resistor must be more less that the R_PULL-UP_max - usually, the value of 10kohm is using for the resistor pull-up.

• Current using when the switch is closed

$I_{R_{Pull-Up}} = \frac{VDD - VDD_{low}}{R_{Pull-up}} = \frac{3.3 - 0.66}{10k}$ = 264 uA

• power dispersed by the resistance push-pull when the switch is actived

$P_{R_{Pull-Up}} = (VDD - VDD_{low}) \cdot I_{R_{Pull-Up}} = (3.3V - 0.66V)\cdot 262uA$ = 696.96 uW

LEDS For DSIPLAY FIXME

A venir !!!

Layout

• 

  Extension Explorer 16 - cross fire - PCB Feux Tricolores - Kicad

• 

  H1 - Cross Light - Layout - Kicad

BOM - Bill of Material

Cross Fire Part

BOM for the Feux Tricolor

Designation	Nb de composants	Fournisseur	Référence	Prix
Led Rouge 5mm	4	Farnell	2112111	0.307 CHFrs /pieces
Led Rouge SMD (option)	4	Farnell	8554641	0.0982 CHFrs /5pieces
Led Orange 5mm	4	Farnell	1003212	0.257 CHFrs /pieces
Led Orange SMD (option)	4	Farnell	8554552	0.537 CHFrs /5pieces
Led Verte 5mm	4	Farnell	2217954	0.368 CHFrs /pieces
Led Verte SMD (option)	4	Farnell	8554609	0.326 CHFrs /5pieces
Resistance SMD 110 ohm 100mW	4	Farnell	2351021	0.01 CHFrs /pieces
Resistance SMD 140 ohm 100mW	4	Farnell	2351049	0.01 CHFrs /pieces
Resistance SMD 150 ohm 100mW	4	Farnell	9332596	0.0734 CHFrs / 50pieces
Resistance SMD 10kohm 100mW	4	Farnell	9332391	0.082 CHFrs / 50pieces
Commutateur Tactile	1	Farnell	1555985	0.155 CHFrs /pieces
Connecteur 120pin	1	Digikey	MEC1-160-02-S-D-A or MEC1-160-02-F-DEM2	9.3 $/pieces

LED DISPLAY FIXME

A venir

Assembly

• 

  montage en VerroBoard Feux Tricolores

Tests

• 

  Test Feux Tricolores -> feux rouges

• 

  Test Feux Tricolores -> feux verts

• Petite vidéo des premiers tests fonctionnels, soyez indulgent

Documentation

PDF FILE

• datasheet on the RED/ORANGE/GREEN LED -> AVAGO File:LED RED.pdf
• datasheet on the RED/ORANGE/GREEN LED SMD -> AVAGO File:LED SMD.pdf
• datasheet of one touch commande (microswitch tactile) -> ALCOSWITCH File:Microswitch.pdf

required links

• explication sur le calcul d'une résistance Push Pull
• Doc PDF Datasheet DSPIC33FJxxx
• wiki sur les transistors MOSFET

Contributor

• User:Philoux