Smart Coaster using ATtiny85 and mlx90615 by nid69ita

Last crawled date: 3 years ago

Connect to usb battery or PC, cable usb only use vcc/gnd. Green when no object on top.
With a heavy object, pushbutton HIGH, sensor read temperature. Blue with ice, yellow/red with hot water. On stl no hole for cable, I used a drill.
In code T1 to T4 level for colors/temperature
I used an CJMCU LilyTiny (AtTiny85) as MCU, for temperature reading an MLX90615, for leds a ring of 16 led WS2812. Libraries for mlx and Neopixel for leds.
Code (missing hashtag character):
include //Adafruit_NeoPixel.h
include // Wire.h
include "mlx90615.h"
const byte PIN_NEO=1;
const byte PIN_BUTTON=4;
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN_NEO, NEO_GRB + NEO_KHZ800);
MLX90615 mlx = MLX90615(); // -40 to +115
define K_TMIN -400
define K_T1 0
define K_T2 200
define K_T3 400
define K_T4 800
define K_TMAX 1150
byte r,g,b;
int temp;
void setup()
{ pinMode(PIN_BUTTON,INPUT);
mlx.begin();
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop()
{
if(digitalRead(PIN_BUTTON)==LOW)
{ for(int i=0; istrip.show();
return;
}
temp = mlx.get_object_temp()*10.0; //float temp=mlx.get_object_temp();
for(int i=0; i{ if(temp < K_T1) // -1=azure-> -40° blue
{ r = 0; b = 255;
g = map(temp, K_TMIN, K_T1+1, 0, 255);
}
else if(temp <= K_T2) // 0=azure-> 20° white
{ r = map(temp, K_T2, K_T1 , 255, 0);
g = 255; b = 255;
}
else if(temp <= K_T3) // 21°=bianco -> 60° giallo
{ b = map(temp, K_T2+1, K_T3 , 255, 0);
r = 255; g = 255;
}
else if(temp <= K_T4) // 61° yellow -> 90° red
{ g = map(temp, K_T3+1, K_T4 , 255, 0);
r = 255; b = 0;
}
else // 91=red-> 115° black
{ r = map(temp, K_T4+1, K_TMAX, 255, 0);
g = 0; b = 0;
}
strip.setPixelColor(i, r, g, b);
}
strip.show();
delay(2000);
}
Pinout:
P4 to button
P0 to mlx (sda) PB0
P2 to mlx (scl) PB2
P1 to led ring