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The Pandemic lockdown has forced us to work with the only components we have at home. I am working on a battery-operated esp32 pico board having other sensors hooked up to it that need 5v of supply. So I connected two rechargeable 3.7v Li-Ion batteries in series and attached them to LM1117t for 5v regulated supply. I am planning to charge these batteries with a solar panel interfaced with an mcp73831 charge controller (I have two units with me). I have checked the charger setup and sure enough, it charges a 3.7v Li-Ion battery up to 4.2v. The problem is, how to charge these batteries individually when they are connected in series to form input for LM1117t regulator? :
View attachment BatterySelector.jpg
lm1117t can withstand up to 10v input. In order to extend battery life, the esp32 goes to deep sleep and wakes up every hour for a 30-second operation before going to deep sleep again. I have bits, op-amps and two more 3.7 batteries with me right now, so Any ideas, suggestions and/or modifications would be of great help to me, Thank you.
The Pandemic lockdown has forced us to work with the only components we have at home. I am working on a battery-operated esp32 pico board having other sensors hooked up to it that need 5v of supply. So I connected two rechargeable 3.7v Li-Ion batteries in series and attached them to LM1117t for 5v regulated supply. I am planning to charge these batteries with a solar panel interfaced with an mcp73831 charge controller (I have two units with me). I have checked the charger setup and sure enough, it charges a 3.7v Li-Ion battery up to 4.2v. The problem is, how to charge these batteries individually when they are connected in series to form input for LM1117t regulator? :
View attachment BatterySelector.jpg
lm1117t can withstand up to 10v input. In order to extend battery life, the esp32 goes to deep sleep and wakes up every hour for a 30-second operation before going to deep sleep again. I have bits, op-amps and two more 3.7 batteries with me right now, so Any ideas, suggestions and/or modifications would be of great help to me, Thank you.
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