Timeline for Unwanted "memory effect" on a bus with optocouplers
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Jan 2, 2014 at 22:08 | comment | added | Claudio | I was editing my question now supplying the waveforms that make it clearer. I'm now analyzing what you said and soon comment on it. Thanks! | |
| Jan 1, 2014 at 17:53 | comment | added | supercat | @Claudio: See my edit above. | |
| Jan 1, 2014 at 17:53 | history | edited | supercat | CC BY-SA 3.0 |
added 1488 characters in body
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| Dec 31, 2013 at 20:55 | comment | added | Claudio | About the second part, the L1, L2.. Lx lines are always outputs and the bits B1..B8 are connected through a 74LV240 to a microcontroller port configured always as input. That said, I didn't understand completely what you suggested about setting the pins to outputs and then back to inputs, maybe I just didn't supply enough information to make it clear... | |
| Dec 31, 2013 at 20:48 | comment | added | Claudio | Trying to isolate the problem I ended up getting the two optos with their collectors shared and connected to a 10K resistor on a protoboard and the effect was the same, so I ruled out interference from 74LV240, which was the only part directly connected to them. | |
| Dec 31, 2013 at 4:02 | history | answered | supercat | CC BY-SA 3.0 |