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linearize light input according to physics (100% accurate)

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shark 2018-11-19 16:47:52 +00:00
parent 9e68874c7b
commit d9733c95c0
1 changed files with 24 additions and 16 deletions
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40
acrylic-art-code/acrylic-art-code.ino
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@ -11,25 +11,29 @@ void setup() {
void loop() { void loop() {
int ss = 20; // sample size for light sensor int ss = 20; // sample size for light sensor
int average = 0; int average = 0;
for (int x = 0; x < ss; x++) { for (int x = 0; x < ss; x++) {
average += analogRead(light) / 4; //average += 256-log(256-analogRead(0) / 4) * (256 /5.55); // old linearization
//linearization using resistance to lux relationship
average += (1250000.0 * pow(1023-analogRead(0), -1.4059) - 73) / 2.08;
delay(3); delay(3);
} }
average /= ss; average /= ss;
if (oldavg == 0) { //Serial.println(average);
if(oldavg == 0) {
oldavg = average; oldavg = average;
} }
digitalWrite(13, HIGH); digitalWrite(13, HIGH);
if (oldavg != average) { if(oldavg != average) {
Serial.print("Goal: "); Serial.print("Goal: ");
Serial.println(average); Serial.println(average);
} }
while (oldavg < average) { while(oldavg < average) {
oldavg ++; oldavg += 1;
setColor(oldavg); setColor(oldavg);
} }
while (oldavg > average) { while(oldavg > average) {
oldavg --; oldavg -= 1;
setColor(oldavg); setColor(oldavg);
} }
digitalWrite(13, LOW); digitalWrite(13, LOW);
@ -65,25 +69,29 @@ void setup() {
void loop() { void loop() {
int ss = 20; // sample size for light sensor int ss = 20; // sample size for light sensor
int average = 0; int average = 0;
for (int x = 0; x < ss; x++) { for (int x = 0; x < ss; x++) {
average += analogRead(light) / 4; //average += 256-log(256-analogRead(0) / 4) * (256 /5.55); // old linearization
//linearization using resistance to lux relationship
average += (1250000.0 * pow(1023-analogRead(0), -1.4059) - 73) / 2.08;
delay(3); delay(3);
} }
average /= ss; average /= ss;
//Serial.println(average);
if(oldavg == 0) { if(oldavg == 0) {
oldavg = average; oldavg = average;
} }
digitalWrite(13, HIGH); digitalWrite(13, HIGH);
if(oldavg != average) { if(oldavg != average) {
Serial.print("Goal: "); Serial.print("Goal: ");
Serial.println(average); Serial.println(average);
} }
while(oldavg < average) { while(oldavg < average) {
oldavg ++; oldavg += 1;
setColor(oldavg); setColor(oldavg);
} }
while(oldavg > average) { while(oldavg > average) {
oldavg --; oldavg -= 1;
setColor(oldavg); setColor(oldavg);
} }
digitalWrite(13, LOW); digitalWrite(13, LOW);