Color capture system and device

1. A color capture device for use in characterizing color of a surface, the color capture device comprising:

at least one LED capable of selectively producing red light, green light, and blue light;

a light sensor circuit;

a loop antenna; and

a microcontroller having a timer circuit, the microcontroller comprising stored computer program instructions that, when executed on the microcontroller, causes the microcontroller to implement computer processes for a color capture sequence, the computer processes comprising:

controlling at least one output pin on the microcontroller to produce the blue light from the at least one LED to illuminate the surface with the blue light;

using the light sensor circuit and the timer circuit to take a blue light intensity measurement of the blue light reflected off of the surface with the blue light on including by measuring an amount of time for cumulative blue light intensity to reach a predetermined blue light level;

controlling at least one output pin on the microcontroller to produce the green light from the at least one LED to illuminate the surface with the green light;

using the light sensor circuit and the timer circuit to take a green light intensity measurement of the green light reflected off of the surface with the green light on including by measuring an amount of time for cumulative green light intensity to reach a predetermined green light level;

controlling at least one output pin on the microcontroller to produce the red light from the at least one LED to illuminate the surface with the red light;

using the light sensor circuit and the timer circuit to take a red light intensity measurement of the red light reflected off of the surface with the red light on including by measuring an amount of time for cumulative red light intensity to reach a predetermined red light level;

formatting a message including color measurement information derived from the light intensity measurements; and

controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.

2. The color capture device of claim 1 , wherein the at least one LED includes separate red, green, and blue LEDs.

3. The color capture device of claim 2 , further comprising:

a first resistor coupled to the blue LED;

a second resistor coupled to the green LED; and

a third resistor coupled to the red LED, wherein the resistors are selected so that the LEDs have substantially equal intensities.

4. The color capture device of claim 1 , wherein the at least one LED includes a three-color red-green-blue LED.

5. The color capture device of claim 1 , wherein using the light sensor circuit and the timer circuit to take a light intensity measurement comprises:

measuring the light intensity after a predetermined amount of time.

6. The color capture device of claim 1 , wherein controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna comprises:

controlling the at least one output pin to produce binary transmission signals.

7. The color capture device of claim 1 , wherein controlling the at least one output pin to produce binary transmission signals comprises:

controlling the at least one output pin to produce a positive current in the loop antenna to transmit a first transmission state; and

controlling the at least one output pin to produce a negative current in the loop antenna to transmit a second transmission state.

8. The color capture device of claim 1 , wherein controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna comprises:

controlling the at least one output pin to produce trinary transmission signals.

9. The color capture device of claim 1 , wherein the light sensor circuit includes a phototransistor.

10. The color capture device of claim 1 , wherein the light sensor circuit includes a photodiode.

11. The color capture device of claim 1 , wherein the light sensor circuit includes a light sensor and a capacitor, the light sensor has an output coupled to charge the capacitor, and the capacitor is coupled to an input pin of the microcontroller.

12. The color capture device of claim 11 , wherein using the light sensor circuit and the timer circuit to take a light intensity measurement comprises:

measuring the capacitor charge after a predetermined amount of time.

13. The color capture device of claim 12 , further comprising an analog-to-digital converter, wherein measuring the capacitor charge after a predetermined amount of time comprises:

using the analog-to-digital converter to convert the capacitor charge to a digital value.

14. The color capture device of claim 1 , wherein the computer processes further comprise:

waiting a predetermined amount of time after taking the light intensity measurements before controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.

15. The color capture device of claim 1 , wherein the computer processes further comprise:

using the light sensor circuit to detect a light level below a predetermined threshold before controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.

16. The color capture device of claim 1 , wherein the computer processes further comprise:

receiving a user input before controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.

17. The color capture device of claim 1 , further comprising a switch having an output coupled to the microcontroller, wherein the computer processes further comprise:

monitoring for user operation of the switch; and

upon detecting user operation of the switch, initiating the color capture sequence.

18. The color capture device of claim 1 , further comprising a switch having an output coupled to the microcontroller, wherein the computer processes further comprise:

monitoring for user operation of the switch; and

upon detecting user operation of the switch, controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.

19. A color capture device for use in characterizing color of a surface, the color capture device comprising:

at least one LED capable of selectively producing red light, green light, and blue light;

a light sensor circuit including a light sensor and a capacitor, wherein the light sensor has an output coupled to charge the capacitor and the capacitor is coupled to an input pin of a microcontroller;

a loop antenna; and

the microcontroller having a timer circuit, the microcontroller comprising stored computer program instructions that, when executed on the microcontroller, causes the microcontroller to implement computer processes for a color capture sequence, the computer processes comprising:

controlling at least one output pin on the microcontroller to produce the blue light from the at least one LED to illuminate the surface with the blue light;

using the light sensor circuit and the timer circuit to take a blue light intensity measurement of the blue light reflected off of the surface with the blue light on including by measuring an amount of time for the capacitor charge to reach a predetermined level;

controlling at least one output pin on the microcontroller to produce the green light from the at least one LED to illuminate the surface with the green light;

using the light sensor circuit and the timer circuit to take a green light intensity measurement of the green light reflected off of the surface with the green light on including by measuring an amount of time for the capacitor charge to reach a predetermined level;

controlling at least one output pin on the microcontroller to produce the red light from the at least one LED to illuminate the surface with the red light;

using the light sensor circuit and the timer circuit to take a red light intensity measurement of the red light reflected off of the surface with the red light on including by measuring an amount of time for the capacitor charge to reach a predetermined level;

formatting a message including color measurement information derived from the light intensity measurements; and

controlling at least one output pin on the microcontroller to transmit the message electromagnetically using the loop antenna.