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Fix possible division by zero #45

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Fix possible division by zero #45

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2 changes: 1 addition & 1 deletion Adafruit_TSL2591.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -276,7 +276,7 @@ float Adafruit_TSL2591::calculateLux(uint16_t ch0, uint16_t ch1) {

// Alternate lux calculation 1
// See: https://github.com/adafruit/Adafruit_TSL2591_Library/issues/14
lux = (((float)ch0 - (float)ch1)) * (1.0F - ((float)ch1 / (float)ch0)) / cpl;
lux = (((float)ch0 - (float)ch1)) * (1.0F - ((float)ch1 / (float)((ch0 != 0) ? ch0 : 1.0F))) / cpl;

// Alternate lux calculation 2
// lux = ( (float)ch0 - ( 1.7F * (float)ch1 ) ) / cpl;
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