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Flex temp ranges #3

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Flex temp ranges #3

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6080c87
Merge remote-tracking branch 'Adafruit/master'
ctgreybeard Feb 18, 2018
2ac04f0
Use moving average for min and max, display min and max
ctgreybeard Feb 18, 2018
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59 changes: 48 additions & 11 deletions examples/thermal_cam_interpolate/thermal_cam_interpolate.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,10 @@ unsigned long delayTime;
#define AMG_COLS 8
#define AMG_ROWS 8
float pixels[AMG_COLS * AMG_ROWS];
int currmin, currmax;
float minavg, maxavg;
float alpha, oneminusalpha; // Exponential avg decay value, 0 < alpha < 1, smaller alpha = slower response
int offset; // Min and max offset from low/high average

#define INTERPOLATED_COLS 24
#define INTERPOLATED_ROWS 24
Expand All @@ -133,6 +137,16 @@ void interpolate_image(float *src, uint8_t src_rows, uint8_t src_cols,
float *dest, uint8_t dest_rows, uint8_t dest_cols);
void setup() {
delay(500);

// Set initial min and max
currmin = MINTEMP;
currmax = MAXTEMP;
minavg = MINTEMP;
maxavg = MAXTEMP;
alpha = 0.05;
oneminusalpha = 1.0 - alpha; // Avoid calculating every time we need it
offset = 0;

Serial.begin(115200);
Serial.println("\n\nAMG88xx Interpolated Thermal Camera!");

Expand All @@ -153,25 +167,48 @@ void loop() {
//read all the pixels
amg.readPixels(pixels);

Serial.print("[");
float framemin = pixels[0]; // An arbitrary starting point
float framemax = pixels[0];

//Serial.print("[");
for(int i=1; i<=AMG88xx_PIXEL_ARRAY_SIZE; i++){
Serial.print(pixels[i-1]);
Serial.print(", ");
if( i%8 == 0 ) Serial.println();
float pix = pixels[i-1];
if( pix < framemin ) framemin = pix;
if( pix > framemax ) framemax = pix;
//Serial.print(pix);
//Serial.print(", ");
//if( i%8 == 0 ) Serial.println();
}
Serial.println("]");
Serial.println();
//Serial.println("]");
//Serial.println();

minavg = alpha * framemin + oneminusalpha * minavg;
maxavg = alpha * framemax + oneminusalpha * maxavg;
currmin = floor(minavg) - offset;
currmax = ceil(maxavg) + offset;
Serial.print("min=");
Serial.print(currmin);
Serial.print(", max=");
Serial.println(currmax);

float dest_2d[INTERPOLATED_ROWS * INTERPOLATED_COLS];

int32_t t = millis();
interpolate_image(pixels, AMG_ROWS, AMG_COLS, dest_2d, INTERPOLATED_ROWS, INTERPOLATED_COLS);
Serial.print("Interpolation took "); Serial.print(millis()-t); Serial.println(" ms");
//Serial.print("Interpolation took "); Serial.print(millis()-t); Serial.println(" ms");

uint16_t boxsize = min(tft.width() / INTERPOLATED_COLS, tft.height() / INTERPOLATED_COLS);

drawpixels(dest_2d, INTERPOLATED_ROWS, INTERPOLATED_COLS, boxsize, boxsize, false);

tft.setCursor(0, 0);
tft.setTextColor(ILI9341_WHITE); tft.setTextSize(1);
tft.fillRect(0, 0, 20, 8, ILI9341_BLACK);
tft.fillRect(20, 0, 8, 8, camColors[255]);
tft.print(currmax);
tft.setCursor(0, tft.height() - 8);
tft.fillRect(0, tft.height() - 8, 20, 8, ILI9341_BLACK);
tft.fillRect(20, tft.height() - 8, 8, 8, camColors[0]);
tft.print(currmin);
//delay(50);
}

Expand All @@ -180,11 +217,11 @@ void drawpixels(float *p, uint8_t rows, uint8_t cols, uint8_t boxWidth, uint8_t
for (int y=0; y<rows; y++) {
for (int x=0; x<cols; x++) {
float val = get_point(p, rows, cols, x, y);
if(val >= MAXTEMP) colorTemp = MAXTEMP;
else if(val <= MINTEMP) colorTemp = MINTEMP;
if(val >= currmax) colorTemp = currmax;
else if(val <= currmin) colorTemp = currmin;
else colorTemp = val;

uint8_t colorIndex = map(colorTemp, MINTEMP, MAXTEMP, 0, 255);
uint8_t colorIndex = map(colorTemp, currmin, currmax, 0, 255);
colorIndex = constrain(colorIndex, 0, 255);
//draw the pixels!
uint16_t color;
Expand Down