Hi,
I have a solar led light system. It uses a 3.2v LifePo4 battery. The LEDs are long since dead but the solar panel continues to trickle charge the battery OK. I'm trying to reuse the solar charging and batteries to run a Raspberry Pico W to which I've added a temperature sensor. The outcome is to use Alexa to get the temperature outside in the garden.
I can do all of this but have a problem. The Pico draws about 50ma at 5v. I've connected the battery to the Pico via VSYS and all works well. Pico VSYS takes a voltage anywhere between 1.8v and 5.5v. I can solder and follow circuit diagrams (although currently at a basic level, but willing to learn more). What I can't do is design circuits, and I need one that will low voltage disconnect at 2.5v and reconnect at, say, 3.2v. It's likely over prolonged grey weather the whole thing will be off longer than it is on due to the small trickle charge from the solar panel. I just want to baby step learn some stuff.
I've seen other examples of lvd's but they tend to be for Li-ion batteries at 3.7v and not for a Pico W and I'm also not quite there to be able to translate values from those examples to the values I need.
Is anyone willing to help with a diagram and briefly describe what and why? I know it's asking a lot. Any guidance is, of course, very welcome.
Regards
I have a solar led light system. It uses a 3.2v LifePo4 battery. The LEDs are long since dead but the solar panel continues to trickle charge the battery OK. I'm trying to reuse the solar charging and batteries to run a Raspberry Pico W to which I've added a temperature sensor. The outcome is to use Alexa to get the temperature outside in the garden.
I can do all of this but have a problem. The Pico draws about 50ma at 5v. I've connected the battery to the Pico via VSYS and all works well. Pico VSYS takes a voltage anywhere between 1.8v and 5.5v. I can solder and follow circuit diagrams (although currently at a basic level, but willing to learn more). What I can't do is design circuits, and I need one that will low voltage disconnect at 2.5v and reconnect at, say, 3.2v. It's likely over prolonged grey weather the whole thing will be off longer than it is on due to the small trickle charge from the solar panel. I just want to baby step learn some stuff.
I've seen other examples of lvd's but they tend to be for Li-ion batteries at 3.7v and not for a Pico W and I'm also not quite there to be able to translate values from those examples to the values I need.
Is anyone willing to help with a diagram and briefly describe what and why? I know it's asking a lot. Any guidance is, of course, very welcome.
Regards