Seeed / Mbed 2 deprecated SEEED_RGB_COLOR_LED_Example

Example program for the Seeed Studio Grove RGB Chainable LED's.

Dependencies:   Chainable_RGB_LED mbed

Fork of be_colorful by Yihui Xiong

main.cpp@1:10700868060f, 2013-10-16 (annotated)

Committer:
yihui
Date:
Wed Oct 16 05:39:07 2013 +0000
Revision:
1:10700868060f
Parent:
0:71564ae5e242
Child:
2:4dae2f80828e
changing color with temperature

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:71564ae5e242 1 #include "mbed.h"
yihui 0:71564ae5e242 2 #include "ChainableLED.h"
yihui 0:71564ae5e242 3
yihui 1:10700868060f 4 //#define DEBUG
yihui 1:10700868060f 5
yihui 1:10700868060f 6 #ifdef DEBUG
yihui 1:10700868060f 7
yihui 1:10700868060f 8 #include "USBSerial.h"
yihui 1:10700868060f 9 #define LOG(args...) pc.printf(args)
yihui 1:10700868060f 10 USBSerial pc;
yihui 1:10700868060f 11
yihui 1:10700868060f 12 #else
yihui 1:10700868060f 13
yihui 1:10700868060f 14 #define LOG(args...)
yihui 1:10700868060f 15
yihui 1:10700868060f 16 #endif // DEBUG
yihui 1:10700868060f 17
yihui 1:10700868060f 18
yihui 0:71564ae5e242 19 // ChainableLED(clk, data, number_of_leds)
yihui 0:71564ae5e242 20 ChainableLED color_led(P1_14, P1_13, 1);
yihui 1:10700868060f 21 AnalogIn thermistor(P0_12);
yihui 1:10700868060f 22
yihui 1:10700868060f 23 float get_temperature()
yihui 1:10700868060f 24 {
yihui 1:10700868060f 25 unsigned int a, beta = 3975;
yihui 1:10700868060f 26 float temperature, resistance;
yihui 1:10700868060f 27
yihui 1:10700868060f 28 a = thermistor.read_u16();
yihui 1:10700868060f 29
yihui 1:10700868060f 30 /* Calculate the resistance of the thermistor from analog votage read. */
yihui 1:10700868060f 31 resistance = (float) 10000.0 * ((65536.0 / a) - 1);
yihui 1:10700868060f 32
yihui 1:10700868060f 33 /* Convert the resistance to temperature using Steinhart's Hart equation */
yihui 1:10700868060f 34 temperature=(1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15;
yihui 1:10700868060f 35
yihui 1:10700868060f 36 return temperature;
yihui 1:10700868060f 37 }
yihui 1:10700868060f 38
yihui 1:10700868060f 39 int temperature2color(float t)
yihui 1:10700868060f 40 {
yihui 1:10700868060f 41 float low = 26;
yihui 1:10700868060f 42 float high = 30;
yihui 1:10700868060f 43 int min = 0;
yihui 1:10700868060f 44 int max = 255;
yihui 1:10700868060f 45 int color;
yihui 1:10700868060f 46
yihui 1:10700868060f 47 if (t < low) {
yihui 1:10700868060f 48 color = min;
yihui 1:10700868060f 49 } else if (t > high) {
yihui 1:10700868060f 50 color = max;
yihui 1:10700868060f 51 } else {
yihui 1:10700868060f 52 color = min + (max - min) * ((t - min) / (max - min));
yihui 1:10700868060f 53 }
yihui 1:10700868060f 54
yihui 1:10700868060f 55 return color;
yihui 1:10700868060f 56 }
yihui 1:10700868060f 57
yihui 0:71564ae5e242 58
yihui 0:71564ae5e242 59 int main() {
yihui 1:10700868060f 60
yihui 0:71564ae5e242 61 while(1) {
yihui 1:10700868060f 62 float t = get_temperature();
yihui 1:10700868060f 63 uint8_t color = temperature2color(t);
yihui 1:10700868060f 64
yihui 1:10700868060f 65 LOG("Temperature: %f\r\n", t);
yihui 1:10700868060f 66 LOG("Color: %d\r\n", color);
yihui 1:10700868060f 67
yihui 0:71564ae5e242 68 // ChainableLED.setColorRGB(index_of_led, red, green, blue)
yihui 1:10700868060f 69 color_led.setColorRGB(0, color, 0xFF - color, 0);
yihui 1:10700868060f 70 wait(0.05);
yihui 0:71564ae5e242 71 }
yihui 0:71564ae5e242 72 }
yihui 0:71564ae5e242 73