Wow that NeoPixel sure is bright, huh? There is a really simple way to dim it. The NeoPixel takes a value from 0 to 255, 255 being the brightest.
Let's dim it by 100. In your code, change:
const int RED[ ] = {255, 0, 0}; to const int RED[ ] = {155, 0, 0};
Still too bright? Let's cut it by 1/3rd by changing:
const int GREEN[ ] = {128, 255, 0}; to const int GREEN[ ]= {128/3, 255/3, 0};
We're going to modify the thermometer circuit to use the NeoPixel to assemble a color-coded thermometer. Glance over at this circuit and see the color which corresponds to a specific temperature.
The wiring for this circuit is easy - just wire up the temperature sensor.
Copy/paste the code below. Then, compile and upload it to your Metro Express!
/*
* CIRC18 Make It Better
* NeoPixel Glance Thermometer - check the weather super quickly!
*
* by Brent Rubell for Adafruit Industries
*/
// Include the Adafruit Neopixel Library
#include <Adafruit_NeoPixel.h>
// The default pin for the NeoPixel on the Metro Express is Pin #40
#define METROPIXELPIN 40
// Temperature Sensor
const int temperaturePin = A0;
// metroPixel takes in both the number of pixels (1, the built-in) and the pin)
Adafruit_NeoPixel metroPixel = Adafruit_NeoPixel(1, METROPIXELPIN);
float temperature = 0;
/* Temperature Colors */
const int RED[ ] = {255, 0, 0};
const int ORANGE[ ] = {255, 153, 51};
const int YELLOW[ ] = {255, 255, 0};
const int LIGHTGREEN[ ] = {128, 255, 0};
const int DARKGREEN[ ] = {76, 153, 0};
const int DARKBLUE[ ] = {0, 0, 255};
const int DARKPURPLE[ ] = {51, 0, 102};
const int BLACK[ ] = {0, 0, 0};
void setup()
{
// Start the Serial at 9600 baud
Serial.begin(9600);
// init the neopixel library
metroPixel.begin();
}
void loop()
{
temperature = getVoltage3V(temperaturePin);
// Convert to degrees C
temperature = (temperature - .5) * 100;
// print the temperature in C to the serial
Serial.println(temperature);
// temp <-> color picker
if (temperature > 40) {
// red
pixelWrite(RED);
}
else if (temperature > 35) {
// orange
pixelWrite(ORANGE);
}
else if (temperature > 30) {
// yellow
pixelWrite(YELLOW);
}
else if (temperature > 25) {
// yellow
pixelWrite(LIGHTGREEN);
}
else if (temperature > 20) {
// dark green
pixelWrite(DARKGREEN);
}
else if (temperature > 5) {
// dark blue
pixelWrite(DARKBLUE);
}
else {
// dark purple
pixelWrite(DARKPURPLE);
}
delay(1000);
}
// takes in a pre-defined color (integer array) and sets the pixel to that color
void pixelWrite(const int* color) {
metroPixel.setPixelColor(0, metroPixel.Color(color[0],color[1],color[2]));
// write the pixel color to the Metro's Neopixel
metroPixel.show();
}
// Voltage to temperature if Vs= 3.3V
float getVoltage3V(int pin){
// 3.3V/1023
return (analogRead(pin) * 0.003225806452);
}
The Glance Thermometer is a modification of the temperature circuit. Which CIRCs have you completed? How would you add a NeoPixel to the circuit to increase functionality, utility or aesthetic?
Page last edited July 18, 2017
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