dmitttri

For now, i am experimentig with FSR (force sensing resistors) as touch sensitive devices. As they are hard to obtain, and bit pricey. I think of my own DIY FSR-s, but this is at the bare beginning, There is few different materials to try, so i can decide if it's worht putting some effort. Piezo devices could do the job, but i did'nt try. FSR-s could be found on Electrotrap site, and not from standard suppliers (Farnell, Schukat, Digikey etc...) Regards

Sorry for some delay in answering. Of course, i'll post this simple schematic. Yes it's Light Dependant Resistor (LDR), mine is 1.6K exposed to weak light, and around 0.1K when extremly lighted (near 10W Halogen bulb). And the response is smooth when moving towards the light. So you'll need OP amp circuitary, to convert this resistance change to 0-5V. I know that i'am not using optimal solution but it works. In attachement is jpg shematic. This is basically current to voltage converter, with null offset triming in order to reject existing ambience light. Resistor 1.2k is responsable for sensitivity, and to be changed with LDR working in other resistance ranges than 0.1.- 1.5K. Shotky diode (0.2 V dropout) is mandatory, because negative voltages does strange things to MIDI remoted software. I use two 9V batteries and 7905 to obtain -5V. And this design is is not power saving one, this was just fastest way to connect LDR-s. Vout is to be connected instead any MIDIBOX pot (akka analog in). Good luck with experimenting. Regards PS. Vidim ima nas jos :)) , evo mail dmitttri@hotmail.com pa se mozda i vidimo, ja studirao u NS-u... svracam ponekad LDR.JPG

Hm, MIDIBOXtacky Fried Chicken. Even most robust PIC and AVR can end up the serving table, along with french fries. From personal expirience, and it's so common. I am not giving up, just thinking about some active substances to keep me up and running. NEXT STEP: Eight touch pads, and Reaktor implemented Drum machine runnung in sync with rest of loop racks. So you can live tap some rythmic patterns. But some questions appears, about the way to implement it: - As controller message with walue that corresopnds to the pressure applied, and Reaktor to detect change and triggers NoteOn with velocity proportional to contreoller value. - A dedicated Mcu just scanning eight voltages, and transmitting NoteOn with velocity proportional to the pressure. I think that this is faster way to go. I'll find the time, no doubt Redgards

LDR mounted on fingers could sound interesting, but the sesitivity and dead zone (amount of light when note is not to be triggered) problems will arise for sure. Fingerpads, like presure sensitive drum pads for playing rythm patterns. This is the spot i miss in my current configuration, also with LED's i omitted due to simplier design. (MidiBox Plus is old-old, and so the Bro&Sis, before MIOS) More sensors, like piezo elements or IR pairs (diode and photodiode), to add more "move converted to sound" capabilities. Lack of free time, unfortuneatly, is killing all my DIY enthusiasm.

Pa da, BG, vidim ima nas samo par ( ti, rogic). Evo mail, jer nije red da ovde koristimo domacicu. dmitttri@hotmail.com There is always tradeoff, printed paper and some glue did the job, not the most elegant as well. Bro&SIs are rahter experimental. With some new ideas ( figerpads, LEDS, more sensors) a bit advanced design could be possible.

Thanks for support, the whole point is the idea interchange. Yes, as you approach with LDR to light source, the control voltage swings 0-5V. Sensitivity is adjustable, with knob (note the LDR sensor picture), in order to avoid offset in existing ambient light. Active range is about 30 cm. In Reaktor instrument, ther is the field labeled SENSOR ROUTER, so the LDR action is to be attached to various parameters ( apart form Loop rack parameters (pithc, volume), there is synth working in the backcround). Heavy atmos are preseted on Brother ( upper right on Brother picture). As there are 2 LDR's and two lamps, synth is controlled as LEFT HAND - pitch, RIGHT HAND - volume. So this is something like THEREMIN. Speaking about hands in action, i thinh that some manufacturers introduced ultrasonic distance meters, for 0-5V voltage generation. There is also electrostatic implementation ( like Theremin ). If there is any intrest, i'll post the schematic for LDR's. It's simple OP AMP circuit, and some discrete electronics. Also i could offer help for pepole who want to experiment with Reaktor. Note that for reasonable performance, you'll need low latency soundcard (mine is MAYA44 USB, with 3ms input, and 4ms output latency), minimun 10ms. Regards Dmitttri