Hi!
I have a problem with the touch sensor:
When i don’t connect the ltc module to the pc and i dont touch sensor, the inputs stays at 127 en when i touch it goes 0,127,0,127,0,127…
When i connect the Ltc module to the pc the input stays 127 also when i touch it!
I also tried to connect Vs to the ground of a power socket, en connect Vs to my skin but nothing helps!
Do you have sugestions to solve this problem?
X-Mass Grtzz
Gert
Often those sensors have a different pinning as usual pots.
Be sure to have the sensor connected right.
Thx for the fast reply
But there isn’t a pot! i use just a wire with at the end a coper plate!
grttzz
Gert
This is really a strange behaviour.
I need a little more information:
For what purpose do you use the LTC module?
Just as a Monitor or do you use also the serial port?
When the LTC is plugged in: What is the behaviour of the other controls ( knobs, pots …). Is a normal knob changing its value by pressing it or not?
greets
Doc
Hi Doc
The LTC modules is for connection to the Pc with the rs232 port!
The behavior of the other stuf is normal! pot’s all work buttons to!
But i was thinking, for the testing purpose i only stuffed 1 * 74hc165
of thad DIN, the other DIN (MIDIBOX 64) is fully stufed
I connected the serial input to the serial output with a wire! of the not stuffed 74hc165 but it is in the end of the row:
______ _______________ ____________________________
| Core | -------> | DIN full stuffed | -------> |DIN first 74hc165 stuffed others|
-------- ------------------ | Connected true with a wire! |
--------------------------------
Is thad maybe the problem?
X-mass greetings To all midi-boxers
Gert
Often those sensors have a different pinning as usual pots.
I meant “compared to usual pots”
so you want your touch sensor to act like a analog controller…
But it this case you have to connect it to the AIN , not to the DIN
Hi SLP
No i just wonne have a DIN to trigger some buttons on my pc!
i’m a light jocky in a club and i wonna replace the old controller to a pc based controller! but without a hardware solution it is not possible!
So i use the touch sensors for really quick flashes en shutters for the pars, strobe
scans, & movingheads!
Grtzz
Gert
if you have built an active LTC module, I expect you removed the optocoupler from the Core?
does it work if you leave out the full stuffed DINx4 board and connect only the board your touch-sensor is connected to?
regards,
Michael
Hi audiocommander
Nope nothing changes! stil 0,127,0,127…
en when i connect myself to the 0V it stays at 127
Grtzz
Gert
ps: I connected the input of the other 3 schift registers with a wire to the output
Is this correct? or should it be resistors?
en when i connect myself to the 0V it stays at 127
hmm… I don’t understand that part ;D
I thought it works if the LTC is not connected (0 + 127): For a button, this would be the expected behaviour. Now when you connect the LTC you only get 127, is that right?
That means the error should be at the LTC or the DIN-module or the optocoupler.
I connected the input of the other 3 schift registers with a wire to the output. Is this correct?
The DINx4 modules have to be chained. That means: Core J9 –> J1 DIN#1 J2 –> J1 DIN#2
What I meant was to leave out the first DINx4 module to see if the error is located at the second DIN.
Can you make a photo and attach it?
In the meanwhile you could go through all the wirings and check them against the plans available @ uCApps.de; I think it sounds like a wiring issue…
best regards,
Michael
ltc not connected:
when i dont do a thing it stays at 127
When i touch it is changes from 0,127,0,127…
When i clamp myself to the 0V it stays at 127
When i connect the ltc:
dont’ touch it stays 127
when i touch it, it also stays at 127
also with skin connected to 0V it stays 127
Jah i knew what you mentiont
But everything else works! alls DIN’s & AIN’s
so i disconected the stuffed module en connected only the module with 1 74hc165
but nothing is different
i don’t use an optocoupler becaus i use an LTC module
Grtzz
Gert
Okay, we’re getting at it, I think everything is working fine:
What exactly are you using as “Touch Sensor”?
just a wire with a plug un the end
just for testing
Does it make anny difference?
This will not work. And if it works, I’d be astonished.
You need a capacity based touch sensor circuit (search for “Quantum QProx QT113”) or if you want to stay connected while touching: a skin resistance circuit. Last one is probably the easiest:
If you measure your skin resistance with a multimeter, you’ll find out, that your skin as about 1 M to 20 M. If you look here: http://www.midibox.org/dokuwiki/doku.php?id=sensors and http://www.midibox.org/forum/index.php?topic=6506.0 you should be able to connect a basic skin restisance sensor. The topic was meant to be used on a AIN, but it’s so easy, I think you’ll be able to adapt it for a digital ON/OFF signal…
However, I’d use a capacity based circuit, because you don’t need to be wired. Just google around a bit and you should find plenty of touch circuits for switches!
cheers,
Michael
i already tryed the QT160 i have him here with me but it works to slow and i cant touch 2 pats at the same time
in this aticle http://www.midibox.org/forum/index.php?topic=4136.0
it saise it would work with just cheap etched board!
Grtzz
Gert
so you connected it exactly like described here: http://www.ucapps.de/mbhp/mbhp_din_touchsensors.pdf ?
And what kind of application are you using (eg MB64(e) ?)
Does anyone know if J14 functionality is supported in all apps?
Best regards,
Michael
Yes exactly the same!
I only connected 2 sensors the others to the ground of thad 74hc165
Or is thad maybe a mistake??
I’m using MB64
I pretty sure J14 is supported
when i disconect J14 is gives all random information…
Greeting
Gert
ps: thx for your time en help
I get crazy from it!
Strange thad it works whith the other fellows but not with me!
I don’t have to modify the code in the pic, am i correct?
Grtzz
Gert
Strange thad it works whith the other fellows but not with me!
Well, as you can read on the second page of the topic you are referring to, similar problems like yours occured. I bet it behaves exactly the same if JazzyPidjay would connect an LTC module!
So I think it’s rather a basic construction error:
1- the first problem i have encountered is when i touch a sensor the message 0,127,0,127,0,127… was send in loop to resolve this problem i have simply connect the 0v of the midibox to the ground.
2- ok at this stade, when i touch a sensor it send correctly the values like a button. (but very quickly and intuitively) but when i touch to or more sensors, there’s no more message send or messages are send randomely.
to fix this problem, i simply plug myself with a jack in the belt directly to my skin connected to the ground
Now my body was perfectly at 0v, the computer & the midibox also !! and i can touch 32 or more sensors, without any problem, like a button.
i search a better way to solve this problem, but for now i plug (myself) & play ;D
This all sounds like grounding/shielding issues. Normally the touch sensing pin J14 is used for motorfaders (see “Touch Sensors” on the MBHP MF page: http://www.ucapps.de/mbhp_mf.html ; there’s also a very detailed explanation by TK here: http://www.midibox.org/forum/index.php?topic=1544.0 ). You don’t need to ground yourself to get that working! So either the MB64 application is not configured to use that kind of feature (don’t know that, 'cause I go no MB64) or there is a basic mistake about your implementation of the touchDetection.
Why don’t you use a normal button switch to test if your basic equipment is working; then you could resume experimenting with different touch detection circuits! J14 is not the only possibility to get that kind of feature…
Best regards,
Michael
I’m also unsure if J14 is supported for touchsensors in other applications than the LC.
With Midibox LC it is definitly working (for the touchsensors of the motorfaders). But I also have to connect myself to ground before I touch a fader.
You changed the resistors correctly for the Touchsensor-DIN (no 10k resistors there?).
Another thing:
J14 (RD4 on the PIC) sits directly beneath the RX Pin. Have you checked these connections? Is there perhaps a short or something else between J14 and RX/TX. This would be the only “harware” explenation for the LTC / Touch behavoiur.
greets
Doc