- Mon Apr 11, 2005 7:03 am
The problem comes from having all of the photocells in series in the column. (switches would be straightforward - the variable resistors are the problem) At first I just had rc circuits and was using rctime to try to read them. However, the photocells seemed to be acting as a set of resistors in parallel. So, I dropped a transistor in between the photocell and the signal line so that only the photocell that was in the current row would be connected. Unfortunately, the resulting readings were pretty funky.