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Minimum Input of Analog Voltage Divider V2

userHead Syifa Nurul.Asyfia 2024-03-05 10:20:32 100 Views1 Replies

Hi, I want to ask why the minimum input of Analog Voltage Divider V2 module is 24.5mV? If I use it with STM32 Nucleo board or any microcontroller with higher ADC, let's say 12-bit ADC and above, would the voltage divider module read 10mV - 15mV input? The output should be around 2mV to 3mV

2024-03-05 10:58:11

Yes, the principle is as you think it is. But at the same time, you need to pay attention to the MCU operating voltage.

The voltage detection module shrinks the input voltage by a factor of 5. Also the minimum analog resolution of the Arduino is 0.0049V (5/1024), so the minimum voltage input to the voltage detection module is 0.0049Vx5 = 0.0245V.

If you are using an ESP32, it operates at 3.3V and has a 12-bit ADC. Then the minimum voltage that can be resolved is 0.0008V, so the voltage detection module input minimum voltage is 0.0008*5=0.0004.

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