Ac voltage measurement using arduino without transformer

PLEASE BE CAREFUL IF YOU’RE USING THE POWER LINE. Hello, and welcome to another tutorial, this one is about measuring Alternating Current (AC), using ACS712 I’m using the 30Amps version which is ACS712 30A, and our lovely Arduino Uno board, I tried to add an OLED screen but unfortunately ended up breaking it while shooting the tutorial so I switched to the LCD, but below you’ll find the ...

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Arduino Uno features 14 digital input/output pins (six of which can be used as PWM outputs), six analog inputs, and a 16MHz quartz crystal. Uno also includes a USB connection, a power jack, an In-Circuit Serial Programming (ICSP) header, and a reset button. This Arduino MCU board contains everything the user needs to support the MCU.

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I need to measure and log the power consumption of a AC device. So far I used an Arduino and an ACS712 current sensor and I assumed the voltage was always 230VAC as it's nominally stated. However I noticed some variations on the voltage values which lead me to believe I need a more accurate measurement. My first try was using this simple circuit:


In this case, we are using a LM7805, which outputs 5 volts. In order for the regulator to output 5 volts, the voltage entering has to be at least 2 volts higher, so it has to be at least 7 volts. 7 volts would work perfect. However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. There are also plenty of inexpensive data logging shields for Arduino so you can measure and data log your mains voltage over a period of time. Here is an AC Voltmeter using Arduino example. Basic transformer designs are the least expensive way to go.PLEASE BE CAREFUL IF YOU’RE USING THE POWER LINE. Hello, and welcome to another tutorial, this one is about measuring Alternating Current (AC), using ACS712 I’m using the 30Amps version which is ACS712 30A, and our lovely Arduino Uno board, I tried to add an OLED screen but unfortunately ended up breaking it while shooting the tutorial so I switched to the LCD, but below you’ll find the ...

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