The sensor
The TeensyWiNo includes a Luminosity Sensor, a TSL2561. To use this sensor, use the libraries Adafruit_Sensor and Adafruit_TSL2561 as described in the TeensyWiNo’s page.
Modification required
The library works out-of-the-box, except that you must change TSL2561_ADDR_FLOAT to TSL2561_ADDR_LOW. It will modify the I2C address used. We can have three TSL2561 on the same I2C bus.
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Then use the sensorapi sketch.