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Rough parameter tuning + reduced flickering 

* rough parameter tuning for TEPT4400 light sensor
* reduced flickering at low brightness values by reducing number of brightness
  levels
This commit is contained in:
Admar Schoonen 2012-01-06 22:32:48 +01:00
parent fc2494631a
commit 9e158c13fd
2 changed files with 13 additions and 13 deletions
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9
wordclock/lightlevelmapping.m
View File

@ -1,15 +1,16 @@
function lightlevelmapping()
MINBRIGHTNESS = 2;
MAXBRIGHTNESS = 20;
MINBRIGHTNESS = 0;
MAXBRIGHTNESS = 10;
LIGHTSENSOR_BOTTOM = 270;
LIGHTSENSOR_TOP = 350;
LIGHTSENSOR_BOTTOM = 0;
LIGHTSENSOR_TOP = 900;
l = [LIGHTSENSOR_BOTTOM - 10:LIGHTSENSOR_TOP + 10];
b = zeros(size(l));
LIGHTSENSOR_SCALE = 1024;
LIGHTSENSOR_BASE = 1.35;
LIGHTSENSOR_BASE = 1.40;
if (LIGHTSENSOR_BASE <= 1)
error 'LIGHTSENSOR_BASE must be > 1';

17
wordclock/wordclock.ino
View File

@ -71,25 +71,24 @@ void SWversion(void);
#define LIGHTSENSOR_INPUTPIN 0
// bottom of light sensor (ambient light values at or lower than this level will
// be mapped to MINBRIGHTNESS)
#define LIGHTSENSOR_BOTTOM 270
#define LIGHTSENSOR_BOTTOM 0
// top of light sensor (ambient light values at or higher than this level will
// be mapped to MAXBRIGHTNESS)
#define LIGHTSENSOR_TOP 300
#define LIGHTSENSOR_TOP 900
// weight for exponential decaying averaging (actual weigth is 2 ^ LIGHTSENSOR_WEIGHT)
#define LIGHTSENSOR_WEIGHT 4
// base of exponential mapping (must be > 1)
#define LIGHTSENSOR_BASE 1.35
#define LIGHTSENSOR_BASE 1.40
// DAY Brightness setting 0 = off 20 = full
#define MAXBRIGHTNESS 20
#define MAXBRIGHTNESS 10
// start MAXBRIGHTNESS at DAYLIGHTHOUR (7 am)
#define DAYLIGHTHOUR 7
// NIGHT Brightness setting 0 = off 20 = full
#define MINBRIGHTNESS 2
// start MINBRIGHTNESS at NIGHTLIGHTHOUR (7 pm)
#define NIGHTLIGHTHOUR 19
#define N_PWM_STEPS 11
//#define LED1 Led1=1
//#define LED2 Led2=1
@ -355,7 +354,7 @@ ISR(TIMER2_OVF_vect) {
digitalWrite(LED4PIN,0);
}
if (timercount==0) timercount=20;
if (timercount==0) timercount=N_PWM_STEPS-1;
@ -496,12 +495,12 @@ void loop(void)
current_brightnes = ambient_light_to_brightness[lightlevel_avg];
Serial.print("lightsensor: ");
/*Serial.print("lightsensor: ");
Serial.print(lightlevel_sample);
Serial.print(" / ");
Serial.print(lightlevel_avg);
Serial.print(", brightness: ");
Serial.println(current_brightnes);
Serial.println(current_brightnes);*/
#else
if ((hour < DAYLIGHTHOUR) | (hour >= NIGHTLIGHTHOUR))
current_brightnes=MINBRIGHTNESS;