I am using a 3.7 5000mAh Lithium ion battery and once fully charged gives up 3.9 volts.
i want to connect it to my Esp32 cam (cam model OV2640) so i bought a buck converter (LM2596) to step down the voltage to 3.3volts but the voltage drops to around 3 or 2.9 volts once my esp32 cam connects and the esp32 cam doesn't work and doesn't connect to my wifi or anything.
Input voltage for that buck has to be about 1V higher than output.
You need a converter that has very low dropout.
If you don't need to draw high current, this could be one example:
You could consider also LDO instead of buck converter.
I am not able to get this board where i live but i am able to get these boards
=> # MP1584 and LM317
if these don't work could you suggest me few boards
should i get a step up voltage module instead so i can turn the 3.9 volts to 5 volts??
( here are few of the step up voltage boards i can get [XL6019, MT3608, or the image i attached] )
Neither of these are good for voltage <4.5V.
I'm not going to suggest you to boost to 5V and then drop it to 3.3V on Esp voltage regulator. That double conversion destroys your battery life.
Can you get this?
i actually meant to step up the voltage to 5 volts so i can power the esp32 cam with 5 volts itself instead of the 3.3 volts
and i am no i am not able to get this either do you think AMS1117 will work??
No.
If you have no choice, then boosting the 3.7V li-ion to 5V is fine.
Yes but Esp is 3.3V MCU and if you power it on 5V pin it down converts it to 3.3V with linear voltage regulator (like AMS1117) that it has onboard.
If you want to test how AMS1117 behaves, you can just connect your battery to Esp 5V pin.
Be aware that you might experience similar voltage drop you had with LM2596.
Most importantly, you need some battery protection to prevent it to be discharged below 3V. In any case, independently from what voltage regulation you use.
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I have tried to find step down LDO to convert 3.9 volts to 3.3 but I am out of luck so I might as well try finding step up modules to convert 3.9 to 5 volts instead and let the esp32 cam inbuilt regulator handle the rest
here are few of the step up modules i found and able to get
MT3608, XL6019
The XL6019 will not work with input voltages less than 5V, so the MT3608 is your only choice.
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will MT3608 work perfectly fine? if yes then I will order it soon
As pointed out it's not the best solution but it will work OK.
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oh I see what would be the cons of using it??
or did u mean its just not practical to use it as i did
I don't understand your question. If the MT3608 is the only boost converter you can buy, what choice do you have?
i meant if I use the MT3608 is there a possibility to over heat or even damage my esp32cam. Yes you are right i have no choice left.
Thanks for your time jim-p you really have helped me out here
No it is fine,
Just make sure you adjust the voltage output to 5V or a little less before you connect it to the ESP cam. Actually adjusting to 4.8V would be fine for the ESP cam and would increase efficiency a little.
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Yes I will do as u suggested thanks a lot again
Have a nice day!
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