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Member #254471

Member Since: September 26, 2011

Country: United States

  • There are a few errors with this tutorial I think I should point out. First: the takeMeasurements () function should be called takeMeasurementsMode3 (), as the second line of this function in the library sets the device in mode 3. Now yes to use mode 3 according to the data sheet: "to perform a new One-Shot sequence, the control register BANK bits should be written with a value of Mode 3 again." Meaning that after each mode 3 reading the code needs to set the sensor to mode 3 again. This is fine for the simple example, however in the Sensor Settings example the sensor is initialized in mode 0 this is continuous reading of channels V, B, G, Y and channels O, R aren't read and will therefore appear as 0 if printMeasurements () is used. But in calling takeMeasurements first in the 2nd example sketch you are overriding any mode selection made during initialization by changing to mode 3 every time through the loop. This is the only reason both sketches produce the same output. If printMeasurements() had been used without takeMeasurements () in the second sketch R and O should be 0 because mode 0 only reads BANK 1 which is V, B, G, and Y. I don't have the AS7262 to test this but I have done it on the NIR version and by removing the takeMeasurements() from the second example the code still runs but R and W are 0 for every iteration because they are read in mode 1 not mode 0. The second problem is with the setIntegrationTime function. It says the integration time will be the value in the setIntegrationTime function * 2.8ms. This is only true when using mode 0 or 1. Mode 2 & 3 read both banks providing 6 readings, again from the data sheet: " Minimum IT for a single bank conversion is 2.8 ms. If data is required from all 6 photodiodes then the device must perform 2 full conversions (2 x Integration Time)." The data sheet also says that "Integration time = <value> * 2.8ms" So the integration time for mode 2 and 3 is 2integration value2.8ms.

  • I'm afraid I kind of have to agree with the people saying this is a waste of time I understand that sparkfun is doing this to reward their customers, but I've been loyal and doing this since 11 eastern when it started and haven't gotten anything for my efforts. i understand the value of random but it would be nice to be guaranteed something for our efforts maybe a 10 dollar credit after a certain number of trys or something?

No public wish lists :(