I bought the card in the link and I want to give 7.4 voltage to it. Is it possible? ESP32 ESP-32S WiFi + Bluetooth Dual-Mode Geliştirme Kartı (38 Pin) Satın Al | Robotistan I could not find information about input voltage of it.
Schematics please. 7.4 voltage might be okey on one special pin, Vin, but ruin the controller connected to any other pins.
I am going to use 2S lipo battery and I am going to power through VIN and GND pins.
Bang!
It is not a good idea because almost half of the battery charge will be wasted in voltage regulator. (battery 7.4, ESP - 3v3)
No, that will not work with that board. The will burn up the 3.3v regulator on that board almost instantly.
There is 3.3V regulator onboard to drop the 5V USB from PC. These little regulators can "generally" handle low-current and a maximum voltage as specified below on Vin (never with USB connected unless the schametic shows a blocking diode to UDB +5.)
As I understand I can use 2s l'po battery from Vin and GND pins. Right?
From ımage you shared.
A 2S Lipo would be 8.4V fully charged.
Okay but still it says like it can accept until 9V. Am I missing somethign?
Trying.
The developer board specs for Vreg is up to 12V input. Just look at the Vreg chip on your board and using the internet look up the Vhandling of the chip.
You need to know how much current a completed project will take.
It will work but onboard regulator might heat up , it depends on what is esp32 doing, you have large current peaks when using WiFi, so you could try for short time with your finger on the voltage regulator. (Btw, do not use 3V3 pin on the board).
Obviously, you want a "yes" but I cannot state with certainity that you will not damage the onboard regulator...
The closer to 5V you supply to the Vin pin, the closer to "normal" the regulator onboard will function. Beyond 5V, the device will generate higher heat and that heat must be dissipated: thermodynamics tell us there are only 3 ways this can be achieved: conduction, convection, and radiance. As the ESP regulator has no formal heatsink and there is no airflow, the regulator chip will heat-up; how hot is entirely a function of the current being sourced through that small IC.
High-end boards do not utilize linear regulators, rather using DC-DC circuitry to move current across voltage gradients without significant heat generation.
DC-to-DC converter - Wikipedia
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