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nRF24 / RF24Audio

Arduino library for streaming data/audio from analog inputs via NRF24L01 modules
http://nrf24.github.io/RF24Audio
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NRF24L01 Analog Output for Speaker #39

Closed AmeerHafez closed 3 years ago

AmeerHafez commented 3 years ago

Hello there. I tried to read the output of a receiver and the signal looked digitized. Is there anyway to output it in analog form?

And yes I tested it with a normal speaker and it sounds fine but the signal I receive on the oscilloscope looked like a pwm signal

Avamander commented 3 years ago

What are you trying to do? What do you mean by "tried to read"?

AmeerHafez commented 3 years ago

read as in viewing it on oscilloscope. I'm trying to output analog signal from the receiver side but it looked digitized..

TMRh20 commented 3 years ago

It is PWM. The smaller Arduino devices don’t have a DAC. The best you can do i think is filter the output to get more of an analog signal.

On Sep 1, 2021, at 4:56 AM, AmeerHafez @.***> wrote:

 read as in viewing it on oscilloscope. I'm trying to output analog signal from the receiver side but it looked digitized..

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AmeerHafez commented 3 years ago

mhmm .. if i lower the sample rate of the transmission is it going to make it more like an analog signal? I'm planning to have a similar input signal by avoiding filters or DAC .. so what i understand is that arduino nano/uno can not output analog?

Avamander commented 3 years ago

so what i understand is that arduino nano/uno can not output analog?

No, they can't.

AmeerHafez commented 3 years ago

It is PWM. The smaller Arduino devices don’t have a DAC. The best you can do i think is filter the output to get more of an analog signal. …

Well what kind of filter? and how do I design the filter? Sorry I'm new to this

Avamander commented 3 years ago

A DAC would work better, but you can use a low-pass filter that lets your intended frequency range trough, but filters the rest. There are calculators out there for low-pass filters.

AmeerHafez commented 3 years ago

A DAC would work better, but you can use a low-pass filter that lets your intended frequency range trough, but filters the rest. There are calculators out there for low-pass filters.

mhmm.. is it possible to output the analog signal using arudino duo? It has embedded DAC inside it...

TMRh20 commented 3 years ago

The auto analogue audio library supports Arduino due but is a bit harder to use.

On Sep 2, 2021, at 5:40 AM, AmeerHafez @.***> wrote:

 A DAC would work better, but you can use a low-pass filter that lets your intended frequency range trough, but filters the rest. There are calculators out there for low-pass filters.

mhmm.. is it possible to output the analog signal using arudino duo? It has embedded DAC inside it...

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AmeerHafez commented 3 years ago

Ok thank you.. That is what i needed to know