One more MegaDrum firmware to test

[dmitri]

Looks like low value resistor is a wrong direction. If it's not too much trouble, can you try with a 10k-22k resistor?

Errmmmh... Could you explain a bit what are you after. I'll do that, but I just disassembed the trigger and made some changes (different fixing arrangement for the piezo) and the location of the piezo is not exactly in the center anymore (a mistake). I have read that the position of the trigger is very critical for positional sensing. ...but don't know for sure might be a rumor. I'll fix the position anyway tomorrow.

_
Kurtsa

Yes, position of the piezo is important, it must be in the centre for proper results.

[fuzzysnuggleduck]

fuzzysnuggleduck,
I'm also using a Mac and have the same problem with MCT.
But to do this test you only need your MD.
You can set your parameters using Left-Right-Up-Down buttons, save your settings in MD and simply look at the LCD to get the values needed to test this firmware.

I know but don't all my current settings disappear when I send MegaDrum a new firmware? I worked hard on getting those current settings and it's just a bit painful to setup all my parameters again through the button interface. Tweaks? fine. Reconfiguring the whole thing? Too much time right now as I don't have the luxury of keeping my MegaDrum at home (it's in the "studio").

[dmitri]

fuzzysnuggleduck,
I'm also using a Mac and have the same problem with MCT.
But to do this test you only need your MD.
You can set your parameters using Left-Right-Up-Down buttons, save your settings in MD and simply look at the LCD to get the values needed to test this firmware.

I know but don't all my current settings disappear when I send MegaDrum a new firmware? I worked hard on getting those current settings and it's just a bit painful to setup all my parameters again through the button interface. Tweaks? fine. Reconfiguring the whole thing? Too much time right now as I don't have the luxury of keeping my MegaDrum at home (it's in the "studio").

If MCT doesn't work for you on Mac, raise it with elrules in viewtopic.php?f=4&t=400. The more people try to help elrules, the faster the MCT issues on Mac will go away.

[Ken Forgettable]

*- cut -*
If you look the pictures of my earlier post... the narrow (200-300us) negative peak just in the beginning of the pulse seems to be actually very well representing the strength of the hit. Kurtsa

On a tight 8" head there is measurable change in the width of the initial impulse (IP), however I'm loosing the IP entirely on a loose/medium tuned 18" head.

I suspect this IP is only a measure of displacement from the initial hit and for my purposes is unrelated to the induced frequency of the head.

*-cut -*
Can you tune mesh's tension?

We need a repeatable way to do this - http://en.wikipedia.org/wiki/Coefficient_of_restitution as I have back ache from picking up ball bearings.

[elrules]

For Roland modules, pads with a diameter higher than 12'' are not very suitable for positional sensing. Tested by many vdrums forum users. 10'' and 12'' seems to be the best choices, while 14'' is more or less acceptable, 16 and greater suck with positional sensing

[Ken Forgettable]

Looks like dimtris' insight was right again then - I'd rather have my teeth pulled than change my kit.

Anyway, ta for the info' ...

[jeffbeckib]

In Light of this new topic, I've made 3 Acoustic to Electric toms that worked flawless with Alesis Trigger I/O, which will be going up on Ebay the second I get my MD completed. My question is this. Should I change my approach to how I'm designing these next drums I'm going to build to work better with Megadrum? I'm using the Cross Bar technique with the roland type cone in the center and a piezo mounted on the inner shell next to a lug. Works great for me, but Im' reading about people adding a resistor now to their setup. Anything I should change or add to my current design?

[dizzib3]

This looks really interesting. I'll try to get you some results using my dual-zone 12 x 5 inch Jobeky http://www.jobekydrums.co.uk/#/stealth/4530095772

[Ken Forgettable]

Just to be clear about testing a <= 14" mesh drum with central piezo.

1. Ceramic to input 9 and plate to GND. Piezo plate mounted face down - that is; ceramic in contact with the cone.

If the above is right then we're not measuring a change in the width of the initial impulse (IP) - the narrow (200-300us) negative peak just in the beginning are we...

2. Four or more measuring points.

(But a half radius measurement will fall about a circular node and may not be representative of either the impulse or of the oscillation ...)

All correct?

Do most people have the cones set about 5mm clear of the rim - what do the commercials (Roland in particular) do?

<edit> It's patently obvious http://sounddiy.free.fr/pads.html

[dizzib3]

My results seem quite different to Kurtsa's and I'm not sure why harder hits give lower numbers.

This is using an unmodified 12x5 in Jobkey snare http://www.jobekydrums.co.uk/#/stealth/4530095772


LIGHT

Nr (Near rim)
25
29
43
33
19

Bcar (Between centre and rim)
85
93
21
83
89

Nc (Near centre)
185
185
173
179
199

Oc (On centre)
87
131
101
77
67


MED

Nr
49
53
59
53
63

Bcar
117
111
120
85
97

Nc
89
87
81
99
81

Oc
93
91
93
93
98


HARD

Nr
15
15
15
9
3

Bcar
11
11
9
9
3

Nc
3
3
5
13
3

Oc
7
3
7
11
5
7