What is the effect of wrong voltage to ESP32 (2024)

FAQs

What is the effect of wrong voltage to ESP32? ›

If there is a USB-socket then there is a voltage-regulator on the microcontroler-board that does regulate down to 3.3V. You can connect 5V to the Vin-pin. But only to the V-In-pin. So applying 3.8V to the 3.3V input pin of the ESP32 will destroy it.

The ESP32's operating voltage range is 2.2 to 3.6V.

The device should shut down for battery safety when the voltage is 3.2V.

They both can have very different power needs to work properly. Are your LEDs 12 V or 5 V? You can use either and still supply your ESP32 board.

Another option that you have is to power your ESP32 is to use a 3.3V regulated power supply. For this, you will use the 3.3 Volt and GND pins. You can connect a regulated 3.3V voltage supply to the 3.3V and GND pins.

The ESP32 ADCs can measure analog voltages from 0 V to Vref. Among different chips, the Vref varies, the median is 1.1 V. In order to convert voltages larger than Vref, input voltages can be attenuated before being input to the ADCs.

The minimum supply voltage is 3.6 V to run an ESP32 module. The supply voltage should be under 10 V for both input capacitor rated voltage and LDO junction temperature rating.

The ESP32 is a 3.3V device, which means that all of its input and output pins are designed to operate with a maximum voltage of 3.3 volts.

While the datasheets clearly state the maximum input is VDD +0.3V (the chip will operate as low as 2.3V if no flash or PSRAM is present) there are "official" statements from representatives of Espressif stating the pins are 5V tolerant.

The resolution of the measurements is 12 bits, so the measurements are between 0 and 4095. Unlike the Arduino, the analog inputs on the ESP32 must not exceed a voltage of 3.3V.

What is the voltage read in ESP32? ›

Reading an analog value with the ESP32 means you can measure varying voltage levels between 0 V and 3.3 V. What is this? The voltage measured is then assigned to a value between 0 and 4095, in which 0 V corresponds to 0, and 3.3 V corresponds to 4095.

2.2 to 3.6V operating range. 2.5 µA deep sleep current. 28 GPIO. 10-electrode capacitive touch support.

Each GPIO pin is rated at 40mA for a ESP32. It is recommended that a max of 20mA per GPIO pin for best thingies. The developer boards as specked out to having a 3V3 LDO that should supply 250mA. 250mA is the ESP 32's max current draw with every GPIO pin on and every API module in use.

The ideal input voltage to the ESP regulator is 6/7 volts. Putting 12V on the ESP32 regulator turns the regulator into a heater with having to do away with 6/7 volts as heat. I'd use the 12V stepped down, switching regulator, to 5ish volts to power the ESP32.

You can power the ESP32 via the 3.3V pin. All other power sources are regulated down to 3.3V on the board. It is possible that other things on the board might not work correctly, though. Check the docs for possible cautions.

Power Supply for ESP32

Many Lithium-Ion/Lithium Polymer Batteries can only charge up to 4.2V, which is low for the ESP32 Board. Therefore, we need to increase the battery voltage from 2.8V-3.7V to 5V.

While the datasheets clearly state the maximum input is VDD +0.3V (the chip will operate as low as 2.3V if no flash or PSRAM is present) there are "official" statements from representatives of Espressif stating the pins are 5V tolerant.

Due to the soldered AMS1117-3.3, the ESP32-CAM board supports on the input voltage pin 5V an external unregulated power supply between 4.5 Volt (output voltage + dropout voltage) and up to a maximum of 15 Volt.