analog in with sensor to leds
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ixbalanque
Nov 25, 2012, 1:07:41 AM11/25/12
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I have a problem, I am attaching a sensor to the analog input of the AVR, the output voltage varies linearly from 0 to 1.56V, I want to do is: each change in sensor voltage, lighting the LED's will is ie, the LEDs turn on as the voltage changes have the sensor. I have not idea how to encode.
This is my code:
#include <lightuino3.h>
int reloj = 5; // Reloj sincronización para los MM5451
int DatSerizq = 4; //Datos del MM5451 izq
int DatSerder = 6; //Datos del MM5451 der
int ctrlBrillo = 7; // Control de brillo CPU a MM5451's
/*****************************************************************
global var
*****************************************************************/
int PinAnalogico = 0; //pin de entrada analógica
int val = 0; //var para guardar el valor leído por el conversor
/* Preparación del programa general */
void setup()
{
Serial.begin(9600);
}
void loop()
{
/* Condiciones iniciales */
Lightuino board(reloj, DatSerizq, DatSerder, ctrlBrillo);
board.flags |= CCShield_FASTSET; //Respuesta rápida basada en registros
FlickerBrightness leds(board);
board.set(0x0UL, 0x0UL,0x0);//Apaga driver de LED's
int res = 70;
for (int i=0;i<res;i++)//UP
{
val = analogRead(PinAnalogico)
leds.brightness[i]= CCShield_MAX_BRIGHTNESS-1;
Serial.println(i);
delay(t);
}// FIN UP
for (int i=res;i>=0;i--)//DOWN
{
val = analogRead(PinAnalogico)
leds.brightness[i]= CCShield_MAX_BRIGHTNESS-1;
Serial.println(i);
delay(t);
leds.brightness[i]= 0;
}// FIN DOWN
}// Termina ejecución
Andrew Stone
Nov 25, 2012, 4:45:53 PM11/25/12
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You basically have to read the analog pin and transform its value into a brightness value. By default, the Lightuino's analog detector will detect a range from 0-5v and return a number from 0-1024. But you have a range from 0 - 1.56v. So the maximum value you will get is 1024*1.56/5 (maxVal). To linearly translate into intensity, you'd want a result of maxVal to become CCShield_MAX_BRIGHTNESS and a result of 0 to become 0. The equation in the modified code below does that. But remember that the eye does not see twice as much energy as twice as bright -- it seems to see the square of the energy as twice as bright. So you may want to make a look up table to translate the analog reading into a brightness. On the other hand, your sensor may not be linear either :-).
for (int i=0;i<res;i++)//UP
{
val = analogRead(PinAnalogico);
val = val * CCShield_MAX_BRIGHTNESS/(1024*1.56/5);
val = val * CCShield_MAX_BRIGHTNESS/(1024*1.56/5);
leds.brightness[i]= val;
Serial.println(i);
delay(t);
}// FIN UP
ixbalanque
Nov 25, 2012, 11:46:52 PM11/25/12
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hmm I think I did not explain well ... no need to change the brightness, I need something like this:
for example:
if sensor is equal to 0V -> turns LED0
if sensor is equal to 0.1V -> turns LED1
if sensor is equal to 0.2V -> turns LED2
if sensor is equal to 0.3V -> turns LED3
if sensor is equal to 0.4V -> turns LED4
... ...
if sensor is equal to 0.3V -> turns LED3
if sensor is equal to 0.2V -> turns LED2
if sensor is equal to 0.1V -> turns LED1
if sensor is equal to 0V -> turns LED0
watch this video please:
My code is this now:
#include <lightuino3.h>
/* Asignación de pines del AVR a los MM5451 pines 4 a 7
(4 últimos del bloque)*/
int reloj = 5; // Reloj sincronización para los MM5451
int DatSerizq = 4; //Datos del MM5451 izq
int DatSerder = 6; //Datos del MM5451 der
int ctrlBrillo = 7; // Control de brillo CPU a MM5451's
/*****************************************************************
DECLARACIÓN DE VARIABLES GLOBALES
*****************************************************************/
int PinAnalogico = 0; //pin de entrada analógica
int val = 0; //var para guardar el valor leído por el conversor
float ledsr;
float ledcr;
int led;
/* Preparación del programa general */
void setup()
{
//Inicia el monitor serial arduino
Serial.begin(9600);
}//finaliza setup
int lectura()
{
val = analogRead(PinAnalogico);
/* analog in is of 0 to 1024 but my resolution es 0 to 70 LED
then 1024/69LED = 14.84 because my LED0 = 0V */
ledsr = val/14.84;
ledcr = ledsr +0.5;
led = (int) ledcr;
}
void loop() //*************************** FUNCION DE EJECUCION **************************************
{
/* Condiciones iniciales */
Lightuino board(reloj, DatSerizq, DatSerder, ctrlBrillo);
board.flags |= CCShield_FASTSET; //Respuesta rápida basada en registros
FlickerBrightness leds(board);
board.set(0x0UL, 0x0UL,0x0);//Apaga driver de LED's
leds.StartAutoLoop();//inicializa función autoloop para LED's
while (1)
{
lectura();
leds.brightness[led]= CCShield_MAX_BRIGHTNESS-1;
Serial.println(led);
delay(led);
lectura();
leds.brightness[led]= 0;
//leds.brightness[led]= CCShield_MAX_BRIGHTNESS-1;
}
}// Termina ejecución
thnks
ixbalanque
Nov 26, 2012, 12:00:18 PM11/26/12
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Help me Andrew!! please!
first achievement ... but I still fails :-(
my code is:
void loop() //*************************** FUNCION DE EJECUCION **************************************
{
/* Condiciones iniciales */
Lightuino board(reloj, DatSerizq, DatSerder, ctrlBrillo);
board.flags |= CCShield_FASTSET; //Respuesta rápida basada en registros
FlickerBrightness leds(board);
board.set(0x0UL, 0x0UL,0x0);//Apaga driver de LED's
leds.StartAutoLoop();//inicializa función autoloop para LED's
while (1)
{
lectura1();
leds.brightness[led1]= CCShield_MAX_BRIGHTNESS-1;
Serial.println(led1);
delay(led1);
lectura2();
while (led2 < led1)
{
leds.brightness[led2]= 0;
Serial.println(led2);
delay(led2);
lectura2();
if (led2 == 0)
return;
}
//leds.brightness[led]= CCShield_MAX_BRIGHTNESS-1;
}
}// Termina ejecución
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