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This is the scoure-code of the optical guitar and bass tuner called Stimmmoppet. Please see our wiki: http://www.das-labor.org/wiki/Stimmmopped/en or http://www.das-labor.org/wiki/Stimmmopped (for the german version) In the folder eagle you find the layout and the shematics. I used the free version of eagle. How it functions: ================= This tool assists you in tuning your string instrument to a given tone. It utilizes the stroboscopic effect to give feedback about the adjustment of your instrument. The two LEDs on the board blink with the frequency that the chosen tone has. When the string vibrates with the correct frequency, two lines are projected at a fixed position on the string. If frequencies don't match, the lines appear to be blinking or moving to the observer's eye. The moving or blinking effect decreases with decreasing difference between the two frequencies. Compiling: ========== If you don't want to compile the projekt use the precompiled hexfiled. Otherwise you need avr-gcc >=3.4.6 just type make for the atmega48 or make -f Makefile.m88 for the atmega88 to compile. Getting the Firmware in to the microcontroller: =============================================== The first time you programm your microcontroller you have to fuse the controller. Low-Fuse = 0xf7 High-Fuse = 0xdf Extended-Fuse = 0xf9 If you use avrdude add following parameters: -U lfuse:w:0xf7:m -U hfuse:w:0xdf:m -U efuse:w:0xf9:m For example: avrdude -c usbasb -p m48 -U lfuse:w:0xf7:m -U hfuse:w:0xdf:m -U efuse:w:0xf9:m avrdude -c usbasb -p m88 -U lfuse:w:0xf7:m -U hfuse:w:0xdf:m -U efuse:w:0xf9:m (Don«t forget the jumper for the slowspeedmode on usbasb.) For both processors there are precompiled hexfiles available. You can progamm it with avrdude with following command: avrdude -c usbasb -p m48 -U flash:w:stimmopped_m48.hex avrdude -c usbasb -p m88 -U flash:w:stimmopped_m88.hex Using the Simmmoppet: ===================== Menu Switch S1 (right): is used for switching between instument notes and instument chooser menu. The instument chooser menu is displayed brighter. You can change the current instument with switch S2 (left). The following programmed instuments are available: b bass (5 strings and also droped) +--> with notes b0 (string 5), d1 (string 4 droped), E1 (sting 4), A1 (string 3), d2 (string 2), G2 (string 1) b. Bass (5 strings and also droped) half step down +--> with notes A#0 (string 5), C#1 (string 4 droped), d#1 (string 4), G#1 (string 3), C#2 (string 2), F#2 (string 1) G Guitar (also dorped) +--> with notes d2 (string 6 droped), E2 (string 6), A2 (string 5), d3 (string 4), G3 (string 3), b3 (string 2), E4 (string 1) G. Guitar (also dorped) half step down +--> with notes C#2 (string 6 droped), d#2 (string 6), G#2 (Sstringaite 5), C#3 (string 4), F#3 (string 3), A#3 (string 2), d#4 (string 1) Through S1 you can switch to the instument notes and the first note of the table is showen. On the display now the notename and the octave in a switching cycle showen. Just plug the corresponding string at the postion 12 and tune the sting. if the lines are still its tuned. Switch the note through S2. After 30 secounds of not touching a switch. The device is going into power safe mode. You can turn it on and off throuch touching S1 for more than 2 secounds. Midinotes: ========== no notename 88 C8 87 B7 86 A#7/Bb7 85 A7 84 G#7/Ab7 83 G7 82 F#7/Gb7 81 F7 80 E7 79 D#7/Eb7 78 D7 77 C#7/Db7 76 C7 75 B6 74 A#6/Bb6 73 A6 72 G#6/Ab6 71 G6 70 F#6/Gb6 69 F6 68 E6 67 D#6/Eb6 66 D6 65 C#6/Db6 64 C6 63 B5 62 A#5/Bb5 61 A5 60 G#5/Ab5 59 G5 58 F#5/Gb5 57 F5 56 E5 55 D#5/Eb5 54 D5 53 C#5/Db5 52 C5 51 B4 50 A#4/Bb4 49 A4 concert pitch (440 Hz) 48 G#4/Ab4 47 G4 46 F#4/Gb4 45 F4 44 E4 (guitar string 1) 43 D#4/Eb4 42 D4 41 C#4/Db4 40 C4 (middle C) 39 B3 (guitar string 2) 38 A#3/Bb3 37 A3 36 G#3/Ab3 35 G3 (guitar string 3) 34 F#3/Gb3 33 F3 32 E3 31 D#3/Eb3 30 D3 (guitar string 4) 29 C#3/Db3 28 C3 27 B2 26 A#2/Bb2 25 A2 (guitar string 5) 24 G#2/Ab2 23 G2 (bass string 1) 22 F#2/Gb2 21 F2 20 E2 (guitar string 6) 19 D#2/Eb2 18 D2 (bass string 2) 17 C#2/Db2 16 C2 15 B1 14 A#1/Bb1 13 A1 (bass string 3) 12 G#1/Ab1 11 G1 10 F#1/Gb1 9 F1 8 E1 (bass string 4) 7 D#1/Eb1 6 D1 5 C#1/Db1 4 C1 3 B0 (bass string 5) 2 A#0/Bb0 1 A0