TK.

Upcoming MBHP_MF_NG module

353 posts in this topic

The cheapest alternative I have found was to use 4 DOGM 2x16 displays at $65 (so about 45 EUR) which are also quite compact

at 230mm width total.

Best,

Alex

But these need an additional backlight module each which again raises the price...

Well the alternative would be something like this: cheaper and even more practical, especially when you would like to break up with the "parallel channels" paradigm. mbhp_glcd_ssd1306.jpg

(This is taken from the programmer's section of the forum, and it's an implementation by TK.)

Could you please provide a link, this looks very nice indeed!

Cheers, Emre

EDIT: Just found the link:

Edited by veermaster

Share this post


Link to post
Share on other sites

I really like the whole concept, just one PCB for faders, and it's looking so easy! Thanks for sharing, can't wait to built my own 'little home console'

Share this post


Link to post
Share on other sites

But these need an additional backlight module each which again raises the price...

... naaa... OLEDs don't need backlight - Do you have a backlight for your LEDs too? :frantics:

Share this post


Link to post
Share on other sites

... naaa... OLEDs don't need backlight - Do you have a backlight for your LEDs too? :frantics:

I didn´t mean the OLEDs but the DOGM Displays, but I agree my post can be misunderstanding.

Cheers, Emre

Share this post


Link to post
Share on other sites

I didn´t mean the OLEDs but the DOGM Displays, but I agree my post can be misunderstanding.

Cheers, Emre

Ordering from Mouser in the US, the cheapest DOGM 2x16 display is $11.41 and the backlight is $2.86.

More if you want white, blue or RGB. The $65 was 4 displays and backlights including shipping within the US.

Alex

Share this post


Link to post
Share on other sites

That indeed is a very good price. Thanks for the tip, if only I knew earlier... :)

Emre

Share this post


Link to post
Share on other sites

Just to be on the safe side:

Is it ok to power the motorfaders directly with a 7,5V switching psu and take the same source to power the Core8 (which has the 7805 bringing the 7,5V down to 5V). I know a dropout voltage of at least 2V is needed so that shouldn´t be a problem, I just ask if there is any other problem when powering both sections by the same switching psu that I don´t know of...?

Thanks in advance, Emre

Share this post


Link to post
Share on other sites

It's no problem, to power them from the same PSU (BTW: This is the way it's done on TK's shematic too).

What I'm not sure in your question: "Power directly" - Do you mean without a regulator on the "motor side"? If yes, this would be possible too but you can't "tune" the voltage then, which is very assumable to be needed, for the control-regulation to work smoothly (adjusting the speed of the motor).

Greets, Roger

EDIT:

I wouldn't design limitations from the beginning. You're not sure until testing, if 7.5V will be enough for your faders. Better allow the circuit to run up to 10V on the motor side.

Edited by Screaming_Rabbit

Share this post


Link to post
Share on other sites

It's no problem, to power them from the same PSU (BTW: This is the way it's done on TK's shematic too).

What I'm not sure in your question: "Power directly" - Do you mean without a regulator on the "motor side"? If yes, this would be possible too but you can't "tune" the voltage then, which is very assumable to be needed, for the control-regulation to work smoothly (adjusting the speed of the motor).

Greets, Roger

EDIT:

I wouldn't design limitations from the beginning. You're not sure until testing, if 7.5V will be enough for your faders. Better allow the circuit to run up to 10V on the motor side.

Thank you Roger for your input!

What always worried me was the fact that the datasheet of the Alps Motorfaders says they suck up to 800mA at 10V. For eight faders that would mean max 6,4A which I didn´t know how to realize that easily. So I thought I get a strong switching PSU like

http://www.reichelt.de/Schaltnetzteile-Case-geschlossen/SNT-MW150-7-5/index.html?;ACTION=3;LA=444;GROUP=P861;GROUPID=4959;ARTICLE=85211;START=0;SORT=artnr;OFFSET=1000;SID=28VRnYOKwQARwAABPwTEE00a4566ac3afda6483845e24af133dda which has an adjustable output of 7.13 ~ 8.25V at 20A and use it to power the motors of my faders directly without any regulation inbetween. By also powering the Core8 (with regulation) I would have a load to stabilize the output voltage even when no fader is moving.

Anyhow yesterday I took off the strap/belt (?) of one of the the motors and measured current when run on 7,5V. It was just 20mA, even when I touched the motor to make it work harder (simulating it driving the fader) it only went up to maybe 30/40 mA. Still very far away from 800mA which I guess might only be reached when you fully stop the motor by force, but since later the touch function will stop the motor anyway there is no such high current to be achieved.

So in conclusion a LM317 with its max 1,5A should indeed be enough to power eight faders.

Probably everybody knew all of this before, I´m just thinking loud...

Regards, Emre

Edited by veermaster

Share this post


Link to post
Share on other sites

I also don't know where these 800mA from Alps come from but I never experienced them to suck this much current.

BTW: Stopping the motor without touch is possible (e.g. something lies on the desk and the fader can't move further). For this case, I'll place a PTC-Resistor into the motor-power feed.

Greets, Roger

Share this post


Link to post
Share on other sites

Just as an info:

Out of curiosity I measured the current at 7,5V when fully stopping the motor by force: 330mA...

At 9V it´s 380mA...

Roger, thanks for the tip, I´ll just make sure my cat stays at home so nothing gets in the way of my faders ;-)

Cheers, Emre

Share this post


Link to post
Share on other sites

Hi

I assembled the MF_V3 on a vector board, unfortunately, it doesn't work :-(

I've uploaded MIOS and the MF_V3 application on an other board, so I know that this could not be the problem.

The LED continues going on and off. This is the only behaviour that the module shows.

All voltages are correct.

I'm sure there must be a problem, but I can't find it. Maybe you can give me a hint whereupon i should look after.

Any ideas?

Thank you!

Share this post


Link to post
Share on other sites

I think, I've found the reason!

The midi cables i used don't work with my keyboard. Maybe they are broken. Tomorrow, i know more!

Sorry for asking.... But perhaps this is not the reason :-D

Share this post


Link to post
Share on other sites

Are there any news about the Eagle Layout file?

I would like to build up one Board to test that. I could do the Layout on my own as well, but to get it here would be faster.

Share this post


Link to post
Share on other sites

You can contact SmashTV for the current .brd file (he improved it meanwhile)

Best Regards, Thorsten.

Share this post


Link to post
Share on other sites

I got sidetracked on this.

Do not forget to run the ratsnest command or you will be missing some crucial ground paths.

Best regards!

Tim

v1.brd.zip

Share this post


Link to post
Share on other sites

Hello Thorsten,

will this mf module be compatible with the LPC17 (and its extensionboard with the external ADCs etc.) without major changes?

Greetings,

Nasrudin

Share this post


Link to post
Share on other sites

will this mf module be compatible with the LPC17 (and its extensionboard with the external ADCs etc.) without major changes?

This module provides an autarkic handling of motorfaders thanks to the PIC which is part of the module.

Therefore no external ADC or whatever is required when you are using it in conjunction with the LPC17 module - just connect it to a free MIDI IO port.

(Note that a third MIDI IO port is available at J5B.A6/7 of the core module - this will be properly documented once the project is officially released)

Btw.: I ordered some prototypes with SmashTV's layout meanwhile.

If anybody is interested, I will sell them for 8 EUR (high price because of the low quantity that I ordered)

Best Regards, Thorsten.

Share this post


Link to post
Share on other sites

Meanwhile I got the prototype PCBs... it works!!!

Thanks SmashTV for the great layout! :)

mbhp_mf_ng_final1.jpg

I've 13 spare PCBs which I'm selling for 8 EUR per piece.

If you are interested, just write me a PM with your postal address and PayPal account

Best Regards, Thorsten.

Share this post


Link to post
Share on other sites

I've 13 spare PCBs which I'm selling for 8 EUR per piece.

If you are interested, just write me a PM with your postal address and PayPal account

Hi Thorsten,

i want to buy three of your pcb's. I've sent you a message.

Best regards,

Chris

Share this post


Link to post
Share on other sites

i want to buy three of your pcb's. I've sent you a message.

Welcome chrisk! Not sure why you post that here, though?

Share this post


Link to post
Share on other sites

The PCBs are sold out now!

I will ship in ca. 1..2 days once I got the money from everybody.

Meanwhile I also created a Reichelt Orderlist which can be downloaded from http://www.ucapps.de/mbhp_mf_ng.html

Best Regards, Thorsten.

Share this post


Link to post
Share on other sites

Shipped today:

Ilmenator

Protosx

Smidirin

Chrisk

Stools

Sold out! :)

Best Regards, Thorsten.

Share this post


Link to post
Share on other sites

TK, boards arrived today!!!!

Thank you very much!

I'll start to solder this night.

Thank you again.

Bye

Protosx

Share this post


Link to post
Share on other sites

The board to Norway arrived today - thanks!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now