Home
JAQForum Ver 24.01
Log In or Join  
Active Topics
Local Time 01:13 26 Nov 2024 Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : For those too young to remember the CMM2

     Page 4 of 4    
Author Message
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 4228
Posted: 01:21pm 06 Mar 2024
Copy link to clipboard 
Print this post

Hi Peter,

- no RTC
- solder mask on the rightmost contact for the nunchuck
- R144 seems retrofit (is soldering okay ?) feels like it has solder on the part, but maybe not on the pads. -or- the footprint is too small. Similar to the 2.2 ohm resistor at the ESP-01.

Volhout
PicomiteVGA PETSCII ROBOTS
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9113
Posted: 01:36pm 06 Mar 2024
Copy link to clipboard 
Print this post

Didn't ask for the RTC as they are expensive and I wanted to minimise cost if there might have been issues.
Nunchuk connectors should be fine, just the way I laid it out
R144, R138, U7, U17 + all through hole were soldered by me - extended range parts that I had stock so omitted from the build

Video beautifully clean and audio no discernible noise
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 4228
Posted: 01:44pm 06 Mar 2024
Copy link to clipboard 
Print this post

   
PicomiteVGA PETSCII ROBOTS
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9113
Posted: 02:55pm 06 Mar 2024
Copy link to clipboard 
Print this post

RTC now added and working
Just checking out the performance of the new board

The CMM2 G2 normally runs at a CPU speed of 480MHz but will overclock to 504MHz
The PicoMite normally runs at a CPU speed of 133MHz but will overclock to 378MHz

Time for solar eclipse calculation at maximum overclock speed:

PicoMite    25.5 seconds
CMM2 G2    6.6 seconds
Edited 2024-03-07 00:57 by matherp
 
PilotPirx

Regular Member

Joined: 03/11/2020
Location: Germany
Posts: 68
Posted: 03:31pm 06 Mar 2024
Copy link to clipboard 
Print this post

  Quote  RTC now added and working

Whats the advantage of the external RTC in comparison to the internal RTC of STM?
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9113
Posted: 03:38pm 06 Mar 2024
Copy link to clipboard 
Print this post

  Quote  Whats the advantage of the external RTC in comparison to the internal RTC of STM?


Much more accurate. The internal relies on a typical 32Kz crystal which is subject to the usual temperature variations whereas the DS3231 includes an integrated temperature-compensated crystal oscillator (TCXO)
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 4228
Posted: 03:47pm 06 Mar 2024
Copy link to clipboard 
Print this post

Hi Peter,

In Pico you have greatly improved graphics speed by re-writing blit/scroll routines for optimal speed in 1pixel, 4 pixel, 8 pixel etc. moves (IIRC).

Is this also usefull for CMM2 ?

Volhout
PicomiteVGA PETSCII ROBOTS
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9113
Posted: 04:16pm 06 Mar 2024
Copy link to clipboard 
Print this post

Already done to the nth degree
 
PilotPirx

Regular Member

Joined: 03/11/2020
Location: Germany
Posts: 68
Posted: 04:28pm 06 Mar 2024
Copy link to clipboard 
Print this post

  Quote  Already done to the nth degree

Programming wizard. I can only marvel at that...
 
Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9306
Posted: 09:57pm 06 Mar 2024
Copy link to clipboard 
Print this post

  matherp said  The boards have arrived and program and boot up perfectly. Once I've finished testing everything I'll post the gerbers





Looks very neat and tidy, Peter.    

I was about to order more G2's, but I am going to wait till you have tested and are happy with this new layout, then I can just order these - and not have to do anything other then plop them in the case, really.  

In your ZIP/Github of the gerbers etc, can you please include your front/rear panel files, so that I can order these new ones to suit the new board.
Edited 2024-03-07 08:01 by Grogster
Smoke makes things work. When the smoke gets out, it stops!
 
Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9306
Posted: 06:02am 25 Mar 2024
Copy link to clipboard 
Print this post

Any sign of the new gerbers, Peter?  

I know you hate to be pestered, so just making sure you have not forgotten...  
Smoke makes things work. When the smoke gets out, it stops!
 
LeoNicolas

Guru

Joined: 07/10/2020
Location: Canada
Posts: 479
Posted: 01:20pm 25 Mar 2024
Copy link to clipboard 
Print this post

What is the estimated price?
 
Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9306
Posted: 10:55pm 25 Mar 2024
Copy link to clipboard 
Print this post

  matherp said  The great news is the price £135 for 5 boards (not including postage and tax) fully completed as you see here - nothing left to solder and ready to pop into a box


That breaks down to US$170 + DHL(usually about US$40 or so) and any import duty, so US$42 per unit + international shipping to send each unit off to wherever it needs to go.

That is usually about US$15 for tracked airmail + a small profit margin for me to make it worth the effort, so I'd be setting my new price for the new all-in-one PCB at around US$80-85 all-up, including case, front/rear panels, fully assembled board and international shipping.  Pretty much HALF the price of the current ones, cos all that time soldering on the connectors is no longer an issue.

This new layout is an excellent idea, as some customers still moan about the price of the current one, so if we can effectively HALF the price more or less, that should make them much more desirable then they are now.

That's the estimate that I am working from for now, anyway.
Smoke makes things work. When the smoke gets out, it stops!
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9113
Posted: 08:02am 26 Mar 2024
Copy link to clipboard 
Print this post

Update

I've got the boards and they work fine. I'm just completing the design of the end-panels for the box and then I'll post everything
 
     Page 4 of 4    
Print this page


To reply to this topic, you need to log in.

© JAQ Software 2024