About 1 year ago, I posted about trying to find a way to control high current latching relays in my 200 amp hour lithium battery powered camper I was building. Thanks to forum members, I was able to build a NE555 circuit that latched the charging circuit off when directed by the Orion jr BMS...works fine and is still doing the job.
But here goes. . . Now I want to take it to the next level. The BMS controls both charge and discharge by pulling to ground up to 175ma to enable and releases to enable/disable charge and discharge. I would like to tap into front edge trigger to provide one shot to the two coil latching relay to latch on the relay (enable charge), and then to use the rear edge trigger to one shot the other coil to latch off the relay. The time between the edge pulses could be a few minutes or even days. That depends on charge available from solar panels, alternator, etc. To me it looks like a job for a pair of 555's or a 556 IC. I suspect someone has done this before but I've looked all day and haven't found it. As always, any help would be greatly appreciated.
But here goes. . . Now I want to take it to the next level. The BMS controls both charge and discharge by pulling to ground up to 175ma to enable and releases to enable/disable charge and discharge. I would like to tap into front edge trigger to provide one shot to the two coil latching relay to latch on the relay (enable charge), and then to use the rear edge trigger to one shot the other coil to latch off the relay. The time between the edge pulses could be a few minutes or even days. That depends on charge available from solar panels, alternator, etc. To me it looks like a job for a pair of 555's or a 556 IC. I suspect someone has done this before but I've looked all day and haven't found it. As always, any help would be greatly appreciated.