# Making an Avometer (AC & DC)

#### Abdelrahman Ayman 48

Joined Jun 10, 2021
2
Salam alaikum (peace upon you)
Could I have any help in that project?

Build a digital Avometer using Arduino.
• The device should be able to measure the following:
1. Voltage range [ -9 V, 9 V ].
2. Current Range [ -0.5 A – 0.5 A].
3. Resistance Range [ 50 Ω – 100 kΩ].
4. Can detect voltage and current frequencies up to 500 Hz only “Greater frequencies should be attenuated by 3rd order filter”.

Device sensitivity in each measurement mode should be calculated.

Even more;

Resistance range [10 Ω – 100 MΩ].
• Connectivity Test Feature.
• Measure the frequency of the input voltage and current signal.

Mainly, I have two problems
1) how to do the idea?
2) the circuit collapse after connecting

#### nsaspook

Joined Aug 27, 2009
8,676
Replace the now obsolete term Avometer with Multimeter.

#### KeithWalker

Joined Jul 10, 2017
1,919
What have you tried so far? There are Arduino projects on the internet that explain how to make all of those measurements. Try them, one at a time and then combine them into one program, selecting the function with switches.

#### neonstrobe

Joined May 15, 2009
167
Your Arduino runs on 5V I think (might be 3.3V, youwill need to check the datasheet.)
Analogue inputs need to be in the same range, so you will have to find a way to scale +/-9V to 0...5V. (or 0...3.3V)
You should be able to do that with some resistors. Can you think how?

#### MrAl

Joined Jun 17, 2014
8,477
Salam alaikum (peace upon you)
Could I have any help in that project?

Build a digital Avometer using Arduino.
• The device should be able to measure the following:
1. Voltage range [ -9 V, 9 V ].
2. Current Range [ -0.5 A – 0.5 A].
3. Resistance Range [ 50 Ω – 100 kΩ].
4. Can detect voltage and current frequencies up to 500 Hz only “Greater frequencies should be attenuated by 3rd order filter”.

Device sensitivity in each measurement mode should be calculated.

Even more;

Resistance range [10 Ω – 100 MΩ].
• Connectivity Test Feature.
• Measure the frequency of the input voltage and current signal.

Mainly, I have two problems
1) how to do the idea?
2) the circuit collapse after connecting
Hi,

There are a couple problem with your request, the question itself.

First you say you need to measure a resistance range of 50 Ohms to 100k Ohms, then yo usay 10 Ohms to 100 Megohms. So which is it or do you need both those ranges?

Second, what Arduino board are you using, one with 10 bit ADC resolution or one with 12 bit ADC resolution?
The cheapest ones have 10 bit the more expensive ones have 12bit resolution.
This however is not as important as the first question about the resistance range but would be good to know also.

Third, what did you mean by (and a quote from your first post):
"the circuit collapse after connecting".
Can you explain what you meant by that a little more.

Fourth, have you built any other measuring equipment like this in the past?

Last edited:

#### click_here

Joined Sep 22, 2020
400
Hey - Here is a great place to start