Difference: TCS3200 (4 vs. 5)

Revision 52022-05-17 - UliRaich

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TCS3200 Color Sensor

Introduction

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time.sleep_ms(10)

will wait forever, if the number of cycles to be measured, is never reached. This can happen e.g. if the OUT signal is assigned a wrong GPIO pin. The problem can be solved by starting a timeout counter when the measurement is started. This counter can be used to raise an exception if reaching the _cycles limit takes too long.

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timeout.py is the same program as meas_freq.py with the timeout counter added. The timeout is set to 2s. The number of cycles to be measured is set to 10000 in order to provoke the timeout.

Calibration

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The formula for the calculation of rgb values is given by:

component = max * (Fv - Fb) / (Fw - Fb) where the variables have the following meaning:

component: value of the color component measured
max: maximum value the color component can reach. For many color representations, this is 0xff or 255
Fv: frequency measured for the color component
Fb: frequency measured for a black target
Fw: frequency measured for a white target

This means that we must measure the frequencies of each color component for a black and a white target. This is done in calibration.py.

Detecting colors

Uli Raich - 2022-05-16

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