ColorPAL documentation

tnn

Set Inter-color Transition Time

By default, when colors are displayed in sequence, it’s done one color after the other without any kind of

transition. This behavior can be modified by setting a non-zero transition time between colors. The two-

hex-digit argument accompanying this command establishes the

rate

at which one color blends into the

next during a transition. The overall transition time depend on how dissimilar the two colors are to begin

with. Colors whose RGB components differ by a lot will take more time in their transition than those

whose components are closer. Here’s an example of red blending into blue:

SEROUT sio, baud, ["= R tC0 B !"]

— Light Sensing Commands —

Sample Output from Light Sensor Returns:

nnn

The ColorPAL incorporates a 10-bit analog-to-digital converter to read the voltage output from the

TSL13T light sensor. When the sample command is executed, it takes a reading then outputs it as three

hexadecimal digits. Here is how you might take a green color reading, subtracting the ambient light, for

example:

Red VAR Word

Grn VAR Word

Blu VAR Word

Amb VAR Word

...

SEROUT sio, baud, ["= X s !"]

SERIN sio, baud, [HEX3 Amb]

SEROUT sio, baud, ["= G s !"]

SERIN sio, baud, [HEX3 Grn]

Grn = Grn – Amb

IMPORTANT: When sampling colors with the LED on, use only pure, fully-saturated colors such as R, G,

and B. The reason is that color blends use pulse-width modulation to attain the different shades, and the

sensor is fast enough not to average what it sees over the PWM period. With pure colors, the LED is on

constantly, so this is not an issue.

Multi-sample RGB colors Returns:

nnnnnnnnn

This macro function performs an ambient light measurement, then individual measurements with each of

the red, green, and blue LEDs, subtracting the ambient reading from each. It then outputs three 3-digit

hex numbers representing the ambient-corrected red, green, and blue readings. Here’s an example:

Red VAR Word

Grn VAR Word

Blu VAR Word

...

SEROUT sio, baud, ["= m !"]

SERIN sio, baud, [HEX3 Red, HEX3 Grn, HEX3 Blu]

Select High Sensitivity

Select Low Sensitivity