Create Backup Shutdown to Prevent Battery Drainage

[pesm6540]

Currently, the PCB will continue functioning, even when the voltage input is below levels that are safe for the battery.

For Simman:
We need a firmware fix for the XPOD V4.0 that will act as a failsafe for when the battery is over-drawn to ensure that the battery can be continually used. Nick mentioned that 11.5 should be the low end of that, but I will check specs of the batteries and follow up. Carol said that they died at 9 V, so I would say 10 V kill to be safe, and try to slow it down as soon as it goes to 11.5 V.

Notes for the XPOD V5.0, Safeguard Feature Update:

• Hardware shutoff for unregulated voltage
  • Below 11.5 shuts everything off --> Lowest voltage specs for the batteries
  • Mindful of tolerances for the voltage divider

[coffeye]

Thank you for picking this issue back up! Rylee had designed the voltage regulator to accept a voltage as low as 5V DC in case someone only had USB powering capabilities but perhaps this is not compatible with the pod to work reliably in other applications (ex lead acid 12V). Just because Carol said the batteries went down to 9V doesn' tmean they will last long because dropping that low causes the battery to not fully recharge. 11.5 volts seems a little high so perhaps we can go to 11 volts? Thoughts?

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On Wed, Nov 29, 2023 at 11:32 AM Percy ***@***.***> wrote: Currently, the PCB will continue functioning, even when the voltage input is below levels that are safe for the battery. For Simman: We need a firmware fix for the XPOD V4.0 that will act as a failsafe for when the battery is over-drawn to ensure that the battery can be continually used. Nick mentioned that 11.5 should be the low end of that, but I will check specs of the batteries and follow up. Carol said that they died at 9 V, so I would say 10 V kill to be safe, and try to slow it down as soon as it goes to 11.5 V. Notes for the XPOD V5.0, Safeguard Feature Update: - Hardware shutoff for unregulated voltage - Below 11.5 shuts everything off --> Lowest voltage specs for the batteries - Mindful of tolerances for the voltage divider — Reply to this email directly, view it on GitHub <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcoffeye%2Fxpod%2Fissues%2F14&data=05%7C01%7CEvan.Coffey%40Colorado.EDU%7Ca4df788e316048e6d9ba08dbf109912f%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638368795611408200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dsjki8lTHEOh8EEbFr74%2BUleLX4Ci8CZ25v6UHKKMzU%3D&reserved=0>, or unsubscribe <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAOQSYMRIJWOQUSAHNSHBWTDYG55UNAVCNFSM6AAAAAA775ZHJ2VHI2DSMVQWIX3LMV43ASLTON2WKOZSGAYTOMJYG4YDENA&data=05%7C01%7CEvan.Coffey%40Colorado.EDU%7Ca4df788e316048e6d9ba08dbf109912f%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638368795611408200%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=A340%2BQZRcsIsozT5OoHqp6YTgz9%2BjSLxizQr6lZj%2FT4%3D&reserved=0> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[malolasimman]

so I need to stop the controller, if input goes below 11.5 volts ?