I am working on a project that requires the use of 12V source to operate a closet door latch:
Now it needs to be on battery power since I won’t be able to have access to a wall outlet.
My current investigation goes to the tone of using a voltage regulator to down convert the 12V to 5V for the logic. I still need to check how to not draw current while the photon is asleep, but step by step.
Before the voltage regulator I will use some filtering and then a relay to latch open the the door lock.
My question is… What kind of power source would you recommend? Since it’s 12V and the current battery shields don’t offer such recharging abilities nor fuel gauge monitoring, I am leaning towards AA or D batteries in series, but using 8 seems a bit too much! And I don’t thing they will alast long considering the mechanism draws 600ma when activated and the Photon has its own power consumption. I only plan to use wiFi for reporting when a door opens. So my plan is to use BLE to open the latch while WiFi Sleeps. And when the door is open connect, send an event and then shutdown again until another “open” event exists.
Any ideas welcomed! I tried searching for 5V latches but was unsuccessful!