how do I power an esp32 directly to a 3.7-volt lipo battery
No.
Well you can't really, the ESP32 has a VCC of 3.3v, the LiPo will vary between 3.7v-4.2v and the internal regulator requires more than the 3.7v minimum. So No. the easiest is to use a converter like a MT3608.
You should anyway have a low voltage protection circuit, and when creating LiPo power based modules, i usually add the charger to the main circuit.
so can i connect the battery with the charger module and the charger module to the cam?
with a 220 ohm resistor connected to positive terminal
The ESP32CAMs I have seen use an AMS1117 regulator.
These are quoted as operating down to 1V dropout, which implies they need circa 4.3V input to operate correctly.
Therefore not suitable to operate the ESP32CAM from a battery that will (on average) be at 3.7V.
Connecting a charger will make no difference to this.
No ! The charger module would only work if it has a converter built in like in this project . You would have to modify the divider resistor value. the mt3608 datasheet shows how to calculate these values. with 7.5K & 1K, it is 0.6 * (1 + (7.5 / 1)) = 5.1v.
If you change the 7.5K resistor for a 4.7K resistor you will get 3.42v A little on the high side, but easily within spec (an ESP has a 3.6v absolute maximum input voltage.)
Keep in mind that the TP4056 charger IC does not allow for load-sharing, so you are either charging the battery or using the ESP, but not both at the same time. Adding a load to the circuit while charging can cause the charger to keep charging when the battery is already full, which may cause it to explode.
LiPo's are dangerous and should be handled responsibly !
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Hi,
This is the schematic of the ESP32 CAM.
See that after the input defined with +5V, there is an AMS117 regulator.
This regulator can receive as input voltages up to 15V.
ref: http://www.advanced-monolithic.com/pdf/ds1117.pdf page 2
Check your module, if it has only 2 resistors, (R1 "AND" R2), installed, you will not be able to use the +5V input with voltage above +5V.
But if you have only one resistor, (R1 "OR" R2), then if you use 2 Lipo batteries in series, you will have voltages from 7.4V to 8.4V, and your ESP CAM will work normally.
One will find that the ESP32 CAM needs a strong 5V supply to properly operate. I've not been able to make one operate off of a 3.3V supply, except for when I put super caps across the 3.3V line with a 3amp switching power supply.
In my ESPs projects I use a LIPO battery and this module:
It allows or use of "1" battery together with the charger.
But I also use a module to protect the battery.
I use this 3.3V regulator with a single 18650 battery to power ESP32 projects and have never had a problem. The dropout voltage is a couple hundred mV, so the battery voltage can drop to 3.2V or less (not recommended for the battery!) and still run the ESP32.
I would create a PCB that has all of that.
Given that it does have enough heatsink, which i seriously doubt, though with 2 LiPo's it should work.
I actually don't normally, because of their power hungry nature, and lack of demand that i have for battery powered WiFi devices. But you could do,.
Any idea why it has 2x FS-8205's ? they are dual-channel to begin with, or are they bridged for a higher power rating ?
Hi,
You can use modules with an 8205, but as I have several with 2 I use them.
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