John suggested that moving the cursor via (additional) buttons would work much better than waiting for the cursor mode to automatically switch intervals as I proposed.
The problem is the original Farhan's Minima does not have extra pins available for dedicated connections for additional switches. John suggested maybe we abandon pins 2 and 3, because he has an alternate method of programming his Arduino. I checked the possibilities and it could be done at the expense of Arduino Bootloader use, and at the expense of the programmer DEBUG output. Nether of which I would like to abandon.
An alternate method was suggested by someone (?) on the Minima Reflector, more User Buttons can be provided by a network of Resistors and Switches on an analog pin.
The current FN Switch is on an analog pin, and switches (and resistors) can be added in parallel.
I have successfully added six additional Switches in parallel to the original FN switch, and have written a Sketch Modification to decode them.
I was able to retain the original FN button's definition; Momentary, Double Push, and Long Push.
The first two new switches will be used to move the cursor; "Left" and "Right".
Current the other four switches are currently being defined as the Sketch is being changed.
This new (and preliminary) User Interface (UI) works very natural and smoothly with my new Sketch. I will soon publish the NEW Sketch that I used to decode these switches (unfortunately, I currently have another major project that is interfering with this Hobby project).
The following circuit should be added to implement multiple switches parallel to the original FN Switch. --------+ Arduino | | AVCC|--------+---1K---- +5V | | | = 100nF | | | v | AREF|----+-------+ | | | | 47K = 100nF | | | | | v | | pin26|----+-----4K7---+---4K7---+---4K7---+---4K7---+---4K7---+---4K7---+ | | | | | | | | | FNS S S S S S S | | | | | | | | AGND|----+-----------+---------+---------+---------+---------+---------+ | | --------+ v "FN" "Left" "Right" "SBand" "Up" "Down" btn7 (btn1) (btn2) (btn3) (btn4) (btn5) (btn6) (btn7) Where: 4K7 is a 4.7K ohm resistor 47K is a 47K ohm resistor FNS is the original FN switch S is a new switch = is a capacitor v is a ground and AGND AVCC is: pin 20 on ATMEGA328P-PU, check spec sheet for other packages AREF is: pin 21 on ATMEGA328P-PU, check spec sheet for other packages AGND is: pin 22 on ATMEGA328P-PU, check spec sheet for other packages Note: The use of AVCC, AREF, and AGND with these analog circuits ensure consistance decoded values for use within the Sketch. Note: To avoid ground loops, the ground sides of all Switches should be connected to the same point on the FN Switch and AGND. Note: Not all switches and resistors are necessary, install only the left most desired switches and resistors, the current software only decodes seven switches total. When used with my Alternate Tuning Method Sketch: "Left" and "Right" buttons moves the Cursor "SBand" selects the Side Band Mode; "Auto SB", "USB", or "LSB". "Up" and "Down" switches Ham Band, and saves the current --
Note: this information is preliminary, and applicable to only the most adventurous Minima builders.
See a suggested Button Grouping at:
UPDATE: Jul 2, 2014 12:33
The GitHub that contains the Preliminary Sketch that supports the above is at: