Difference: TCS3200 (2 vs. 3)

Revision 32022-05-16 - UliRaich

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TCS3200 Color Sensor

Introduction

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If we want to read the OUT signal at full speed, then an external high speed counter is needed. Otherwise, we can fix the S0 and S1 signals to 0 and 1 respectively and therefore fix the frequency divider to 2%. This liberates 2 GPIO lines for other purposes.

Added:

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There is still a problem with the meas_freq.py program.
The code:

    while tcs3200._end_tick == 0:
        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.

Calibration

Uli Raich - 2022-05-16

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