6 ms·
Cool. I suppose the reason they're diodes and not just wires is the same reason n-rollover keyboards need diodes, so that current doesn't jump across rows you'r
by 01HNNWZ0MV43FF 2y ago
Cool. I suppose the reason they're diodes and not just wires is the same reason n-rollover keyboards need diodes, so that current doesn't jump across rows you're not trying to read?
- kazinator 2y agoYes; it has to be one way. Current goes from the row wire to the columns that are connected to it via diodes. Some of those columns have other diodes connecting them to other rows. Current must not flow in that reverse direction, otherwise columns would be randomly shorted together via rows that are not currently (no pun intended) being probed.
- pvillano 2y agoThe circuit is a n-rollover keyboard with the appropriate keys held down