Published August 7, 2021

Idea of an Arduino oscilloscope that reads negative tension

We see many projects of arduino oscilloscopes that measures between 0v and 5v with the bias at 2,5v. In this idea there is no biasing.

BeginnerWork in progress361

Idea of an Arduino oscilloscope that reads negative tension

Things used in this project

Hardware components

Arduino UNO

You also need a 12vdc and -12vdc power supply. You can use an old ATX power supply. - resistors for the tension divider ( if needed ) - 2x 1k resistors - 2x 10k resistors - 2x 1n4733a zener diodes

Story

This Arduino oscilloscope makes use of two analog read pins. When the tension of the source is positive ( 0 to 5v ) the signal passes throght the non inverter op amp and enters in analog read 0 and the value appears above the 0 line in graphical oscilloscope. When the tension of the source is negative (0v to -5v), it passes through op amp wich invert the signal to positive. That positive tension enters in analog read 1. Now, when when we have positive tension on analog read 0 ( that means analog read 1 is 0v ( because arduino can't read negative tension )) and so the code in the arduino should represent the value on analog read 0 above the line of 0v in graphical oscilloscope. When we have positive tension on analog read 1 ( that means analog read 0 is 0v ), the code in the arduino should represent the value on analog read 1 below the line of 0v in graphical oscilloscope.

Be very wise when choosing the op amps. This op amp should be chosen considering the type of signals that you gonna use.

You can use one of those old ATX power supplys to provide +12vdc and -12vdc.

If you have to step down the voltage of the source make a tension divider with resistors before the signal enters in the op amps.

This can also be usefull for analising data packets of data transfer protocols that uses positive and negative tensions.

Remember, this is just an idea, you will have to develop the graphical interface of the oscilloscope. I don't have the knowledge to do that part.

Code

Some of the code in pseudo code

void loop{
	
   if analogread 0 = 0 and analogread 1 = 0{
		show in graphical oscilloscope the dot in 0v line
	}

	 if analogread 0 > 0 and analogread 1 = 0{
		show in graphical oscilloscope the dot above the line of 0v
	}

	 if analogread 0 = 0 and analogread 1 > 0{
		show in graphical oscilloscope the dot below of the 0v line
	}
}

// the conjunction of this dots across the time line will form the wave in the graphical oscilloscope

Idea of an Arduino oscilloscope that reads negative tension

Things used in this project

Hardware components

Story

Schematics

Schematic

Code

Some of the code in pseudo code

Credits

mamífero

Comments

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Idea of an Arduino oscilloscope that reads negative tension

Idea of an Arduino oscilloscope that reads negative tension

Things used in this project

Hardware components

Story

Schematics

Schematic

Code

Some of the code in pseudo code

Credits

mamífero

Comments

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