To measure a small AC voltage using a microcontroller (MCU), you can use an analog-to-digital converter (ADC) to convert the analog voltage signal into a digital value that the MCU can process. Here's a step-by-step guide on how to do this:

Choose an MCU with an ADC: Select an MCU that has an ADC with a suitable input range, resolution, and sampling rate for your application. Many MCUs have built-in ADCs, which simplifies the process.
Select an appropriate sensor: Choose a sensor that can measure the AC voltage within the desired range. Some common sensors for measuring AC voltage are the INA219 current sensor and the ACS712 current sensor.
Connect the sensor to the MCU: Connect the sensor's output to an analog input pin on the MCU. Make sure to follow the sensor's datasheet for proper connection and configuration.
Configure the ADC: Set the ADC's reference voltage, input channel, resolution, and sampling rate according to the sensor's specifications and your application requirements.
Write a program to read the ADC value: Write a program that continuously reads the ADC value and stores it in a variable. You can use interrupts or a timer-based approach to read the ADC value periodically.
Calculate the AC voltage: Use the ADC value and the sensor's sensitivity to calculate the AC voltage. The sensitivity is typically provided in the sensor's datasheet.
Display or process the result: Display the calculated AC voltage on an attached display or process the value further in your application.

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: 问了下GPT, 思路貌似没问题. AI是不得了了.
: how to use mcu to measure small ac voltage
: 2023/12/8 14:51:13
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