09-04-2016, 09:00 PM
Maintaining an initial 'state' at power-up has always been a problem in electronic control circuits, because until the circuit is fully energized it 'logically' is not really functional. An MCU is more precise at the low level and has been designed to be more reliable for initial 'state' than either the Pine boards, nor the Raspberry PI.
If it were me, no automated door opener|closer would be attached to my garage door unless I could gaurantee that it would power-up reliably. There are many ways to do that, and most of them are more complex multi-level systems with redundancy and backup.
If I were designing the system it would be on a UPS battery backup system capable of sustaining control for several hours. Also I would have a power-timer on the relay board itself to make sure the relay cannot trip until POR is complete.
If it were me, no automated door opener|closer would be attached to my garage door unless I could gaurantee that it would power-up reliably. There are many ways to do that, and most of them are more complex multi-level systems with redundancy and backup.
If I were designing the system it would be on a UPS battery backup system capable of sustaining control for several hours. Also I would have a power-timer on the relay board itself to make sure the relay cannot trip until POR is complete.
marcushh777 
please join us for a chat @ irc.pine64.xyz:6667 or ssl irc.pine64.xyz:6697
( I regret that I am not able to respond to personal messages; let's meet on irc! )
please join us for a chat @ irc.pine64.xyz:6667 or ssl irc.pine64.xyz:6697
( I regret that I am not able to respond to personal messages; let's meet on irc! )