cornwallav8r:
Retro, isn't C1 needing to be in parallel now series with the relay coil? Wouldn't stay latched once C1 charges up.
No, that's how latching relays work. C1 charging up allows current to flow through the coil causing it to go to the 'set' position. Once C1 is fully charged current stops flowing but the relay still stays in the set position because it's magnetically latched to the 'set' side. When the Pin goes low current flows in the opposite direction causing the relay to go to the 'reset' position where is remains magnetically latched even when the current stops flowing. When a latching relay is placed in either its set or reset position it remains in that position even if physically removed from the circuit.
Lefty