Arduino_DRO

Firmware for Arduino DRO with up to 4 Axis display, Tachometer, Touch Probe, and Bluetooth output suitable for Touch DRO.

This repository is heavily based on the v6.0 code from Rysiu M for connecting cheap digital scales (typically found on machine tools) to an Arduino and sending those data via Bluetooth or serial to a display like TouchDRO. The display and interaction portions are influenced by the People's DRO on chipmaker.ru (or at least that's what Google Translate told me the name was).

Why Another Android DRO Project

I just couldn't find the one I was looking for. RysiuM's is great for working with Touch DRO, but does not have a local non-connected to an Android tablet display option. Oleg A.'s People's DRO has local display, but no ability to connect to Touch DRO. I wanted both.

User Guide

NOTE: This part is not working yet, it's a design specification.

Display

| A/I | x | x | x | x | x | x | x | | A/I | x | x | x | x | x | x | x | | A/I | x | x | x | x | x | x | x | | x | x | x | x | x | x | x | x |

Operating / DRO Mode

Button	Function	Notes
X0	Zero the X axis	display changes to "I" and sets zero point
Y0	Zero the Y axis	display changes to "I" and sets zero point
Z0	Zero the Z axis	display changes to "I" and sets zero point
X (a/i)	Change abs/inc mode for X axis	mode changes between "A" / " "
Y (a/i)	Change abs/inc mode for Y axis	mode changes between "A" / " "
Z (a/i)	Change abs/inc mode for Z axis	mode changes between "A" / " "
---	---	---
+ (up)	1/2 value mode
> (select)	Enter menu
- (down)	Enter inc mode and zero all axes
---	---

Menu

The following buttons to navigate the menu are active when the menu is activated. If no button is pressed for 15 seconds the menu will be dismissed and the Operating / DRO mode will resume.

Button	Function	Notes
+ (up)	Move to next menu item / setting
> (select)	Select displayed menu item
- (down)	Move to previous menu item / setting
---	---	---

The remaining buttons depend on current menu selection and operate as if you had selected that menu item, e.g. the buttons "fall through" to the displayed menu selection.

The menu items are.

Display	Action	Notes
Reverse	Invert axis value	Select axis and it's value is negated
Units	Change display units	Toggle between mnches and mm
Bright	Change display intensity
CPI	Change "counts per inch" for axis	Select axis and change value
1/2 axis	Divide axis value by 1/2	Select axis and it's value is halved
Set Value	Set the value of an axis	Select axis and change value
Zero All	Change all axes to incremental and set their zero	erases previous zero values

Some menu items, like "zero all" take effect immediately, while others invoke a sub-mode where further interaction is required. These sub-modes and the relevant button interactions are detailed below. These are also the "fall through" buttons as described above.

1/2 Axis

Button	Function	Notes
X0	Divide current X value by 2	returns to operating/DRO mode
Y0	Divide current X value by 2	returns to operating/DRO mode
Z0	Divide current X value by 2	returns to operating/DRO mode
---	---	---

Reverse Axis

Button	Function	Notes
X0	Invert the X axis value	returns to operating/DRO mode
Y0	Invert the X axis value	returns to operating/DRO mode
Z0	Invert the X axis value	returns to operating/DRO mode
---	---	---

Brightness

Button	Function	Notes
up	Increase display intensity
select	Save the current intensity	returns to operating/DRO mode
down	Decrease display intensity
---	---	---

Notes

• inch mode displays 4 digit precision, mm mode 3 digits. the last digit is rounded to 0 or 5, similar to the display that comes with the iGaging scales.

Ideas

• use 'long-press' in some way to get more 'buttons'

• axis should blink when setting values / changing numbers

• use rotary encoder to change numbers

• Use last decimal point to show 'mm' no decimal point means inches

• auto-adapt to significant digits? -- auto adapt to larger numbers change .

• iGaging scales are only accurate to 0.001" and 0.01mm

• _-99.9999" and _-999.999mm is overkill by 1

• Notes from https://www.chipmaker.ru/topic/143676/?page=31 and https://www.chipmaker.ru/topic/143676/?page=13

  • left button jumps by digits,

  • up / down buttons respectively increases / decreases the modulus of the number (active sign), from 0 to 9

  • on a sign discharge:

    • up button - makes the number positive and automatically exits the correction mode, if it was positive the sign of the number does not change ,

    • down button - accordingly makes the number negative and exit the correction mode, if it was negative the sign of the number does not change ,

  • At any time, you can exit the correction mode by pressing the first button of the axis to be corrected.

  • Button "X1", "Y1": first press - activate the axis setting (axis blinks) repeated pressing (within 15 seconds) reset the axis to 0 and exit to operating mode, inactivity 15 sec. - exit to operating mode

  • Button "<" - each press during active axis setting - transition by digits (active digit blinks) inactivity 15 sec. - exit to operating mode

  • Button "+", "-" - increases / decreases the value of the active digit after passing all the digits (the dot and the “-” sign flash if the number is negative) - use the “+” , “-” buttons to set the positive / negative sign of the dialed / corrected value, and automatically exit to working mode.

    In the operating mode, you can also exit at any level - by pressing 1 button of the active axis.

  • Button "Z2" :

    • switches the display of readings revolutions / cutting speed, "A" - revolutions / minute, "b" - meters / minute
    • cutting speed is always tied to the readings of the "Y" axis .

• The modes "Radius", "Diameter" are displayed by the symbols "r", "d".

• The modes "Tachometer", "Cutting speed" are displayed by the symbols "t", "S".

Wiring

I don't have a schematic as I just hand-wired things. For those looking for the connections. I'm including a few photos to help. If I get time, I'll draw up the schematic but no promises.

• Microcontroller and Scales
• Display and Buttons

NOTE: I used a resistor ladder network for the pushbuttons. It appears the displays are wired in series.