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Peterthinks
(@peterthinks)
Active Member
Joined: 4 weeks ago
Posts: 9
2020-08-30 5:01 am  

Is there a way to post a picture here? Or is that option locked out for new members?

Perfect is the enemy of good. Hotglue is not a crime!


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codecage
(@codecage)
Member Admin
Joined: 1 year ago
Posts: 724
2020-08-30 12:16 pm  

@peterthinks

Just drag and drop the photo or use the "Attach Files" link just below the text entry area while typing a post.

SteveG


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Peterthinks
(@peterthinks)
Active Member
Joined: 4 weeks ago
Posts: 9
2020-08-30 7:41 pm  

@codecage

20200830 120000

 Thankyou!

 

Perfect is the enemy of good. Hotglue is not a crime!


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John_Duffy
(@john_duffy)
New Member
Joined: 3 weeks ago
Posts: 1
2020-09-03 8:02 am  

Hi,

I am John from Leeds, UK.

I retired two years ago from a software development role. Before that I was a marine engineer and still remember when computers first made an appearance on our ships.
I've been tinkering around with electronics for 50 years but I recently joined a robotics group on the U3A and have started building a line-following robot based on a cheap kit, an ESP32 and an array of IR resistors and detectors. Work in progress!

John

This post was modified 2 weeks ago by John_Duffy

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PerCat
(@percat)
New Member
Joined: 3 weeks ago
Posts: 1
2020-09-04 4:08 am  

Hi Every one,

My name is Kazem I am 68 years old fairly good with hardware but very bad with software

I have a question: I am working on NRF4L01+ with an antenna to send a square wave of max 8 kHz to 2 receivers. I am not sure about the max frequency yet.

I am not sure if NFR is fast enough to handle it?  I am using TMRh20/RF24 library

How can I set the baud rate and upper channel frequencies?

Transmitter and receiver are 40 meters apart

Thanks guys. 

 


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masiman
(@masiman)
New Member
Joined: 2 weeks ago
Posts: 1
2020-09-04 3:42 pm  

Hello, I am Chris from the US.

I am here to learn more about Arduino, Raspberry Pi, how to integrate sensors, logic and motors.  I am comfortable with OS's and software, a little comfortable with hardware, not so much with electronics and components.

I am looking forward to the journey and learning new equipment and techniques.


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codecage
(@codecage)
Member Admin
Joined: 1 year ago
Posts: 724
2020-09-04 4:33 pm  

@masiman

Welcome!  I'm sure you will enjoy the forum and the assistance you'll find here.

SteveG


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Pugwash
(@pugwash)
Prominent Member
Joined: 1 year ago
Posts: 989
2020-09-06 12:53 pm  
Posted by: @percat

I have a question: I am working on NRF4L01+ with an antenna to send a square wave of max 8 kHz to 2 receivers. I am not sure about the max frequency yet.

I am not sure if NFR is fast enough to handle it?  I am using TMRh20/RF24 library

Hi Kazem,

I may be wrong but don't think that would work.

The NRF24L01 is usually used to transmit data packets, rather than continuous signals.

It may be better to create the square wave at the receiver and control "on/off" and "frequency" functions from the transmitter.

As for speed, the frequency of 8000Hz is the equivalent of one full wave every 0.000125 seconds (125µS).


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jrkorman
(@jrkorman)
New Member
Joined: 11 months ago
Posts: 1
2020-09-07 4:28 am  

Well I figured that after almost a year of lurking, I ought to introduce myself. My name is Jim Korman and am now retired to northern Texas. Went into Air Force Electronics out of high school back in the '70s, cross trained into weather. Spent almost 20 years as a programmer after retiring from the Air Force. So now taking all of that together my current project is teaching an Ardunio to talk to various weather sensors.

Jim


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Pugwash
(@pugwash)
Prominent Member
Joined: 1 year ago
Posts: 989
2020-09-07 11:23 am  

@percat

This website is the best reference site for the NRF24L01.

https://maniacbug.github.io/RF24/index.html

You should be able to work out what the limitations are for the RF24.


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MarcDraco
(@fb-commarcdraco)
Active Member
Joined: 2 weeks ago
Posts: 5
2020-09-09 12:31 pm  

Hi,

I'm Marc - a limey occasionally found in Canada (my spiritual home) but currently stranded elsewhere.

I only found Bill by complete accident and couldn't believe my ears when I heard him going into such complex subjects with almost "matter of fact" simplicity but without talking down to the viewers. Even his editing (and he said he used to do these in a week) blew me away.

Not to sound like a complete suck-up, but Bill is the sort of teacher I'd always wished for when I was studying back in the 1970s. I'm actually a retired writer now (if writers ever retire) but I keep my hand in at electronics occasionally.

I'd previously discarded Arduino as a fad (bad mistake) preferring the extra HP of the RPi. And then I saw Bill talking about something (driving a display I think, I've been consuming every video he's produced since then with unstoppable appetite for more).

The problem was that most tutorials I happened across were making LEDs blink and other fairly simple applications that were as easily achieved with discrete components. "Computers," I figured, "are for making decisions," and all these examples are stuff you can do with a 555 or a 741 (remember those?).

Over the last few weeks, I've spent all my beer fund on a whole load of Arduino clones, LED matrices, 7-seg displays, OLEDs, LCDs... and more.

And it's all down to Bill!

Suddenly jobs like my project the "Draco-Leach" incubator (a specialist and fully-automated "Electric Hen") I developed with my friend Victoria, became possible. The previous iterations fell because discrete components proved too complex/expensive for the design and the RPi just consumed way too much current. The D/L is designed to run on batteries or even solar in remote areas where power is spotty, for example.

I've had to put that one down temporarily because my little friend "Marty McFly" Melvin (like the film) wanted to get into flight simming.

Anyway, long story short, I blew the CC up getting a yoke from Honeycomb and then blew my stack when I saw the "quality" of the internal components.

This is a very expensive piece of kit - and thought to be one of the best on the market (under $900) and yet - and the pictures can be seen on their site - it uses what might be viewed as "toy" potentiometers. You know the sort that uses that nasty fibreboard stuff and has the carbon track open to the elements. The sort that you soon end up having to spray with Super Servisol (or similar).

So... I opened my big mouth and promised to make something that would be a drop in upgrade using digital pots to signal the controller and other solid state parts to replace the two, low cost pots.

And that's my story so far!

(I have contacted the manufacturer but you won't be surprised to learn they didn't get back to me.)


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AlJihadi
(@aljihadi)
New Member
Joined: 1 year ago
Posts: 1
2020-09-10 9:42 am  

@peterthinks I went To the My Profile tab, then clicked on Profile on that page to find the Upload Avatar which I thought meant my piccie.  Which it was.

Cheers

 

R

Climate change is not cool.


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