Difference between revisions of "BarBot/Components/Makerslide and Platform"

Latest revision as of 11:49, 5 February 2019

Makerslide and platform

General Description

The 24 RGB Neopixel ring illuminated drinks platform glides along awesome Makerslide!

The platform is moved by a NEMA17 Stepper Motor, 1.8° per step, 1.7 A, 4000 g·cm stepper motor driven by a Pololu stepper driver. The AccelStepper library is used to control the stepper. One cm travel is approx 55 steps.

An ultrasonic sensor is used to detect the presence of a glass. This provides a signal to a local ATtiny85 in the platform, which in turn controls the Neopixel LEDs and provides a "glass present" signal to the master Arduino.

The left hand end of the Makerslide has a limit switch. This should be used to "zero" the stepper on each cycle.

Notes:

Not sure whether the ultrasonic sensor will be affected by spills and splashes.
To prevent overheating of the Pololu driver and/or stepper motor, it is recommended that the stepper driver is disabled whenever the platform is stationary. (However, this does present a risk of not knowing the position if it should be knocked whilst disabled.)

Mounting & hardware

T-slot nuts are used to invisibly (and very nicely) mount the Makerslide.

Logical

The Pololu driver needs three Arduino digital outputs: Enable, Step, Direction

The ATtiny85 in the platform provides a "glass present" signal. (0 = no glass, 1 = glass present)

A further "mode" signal is used to select ultrasonic diagnostic mode (if low when power applied), or over-ride the ultrasonic sensor (if low during normal mode).

Connections

Wire colour	9 way D pin	Signal
Orange	1	+5V supply to ATtiny85 and Neopixel ring
Red	2	Stepper coil B
Blue	3	Stepper coil B
Green	4	Stepper coil A
Black	5	Stepper coil A
Yellow	6	Diagnostics / ultrasonic over-ride "mode" input
White	8	"Glass present" output
Brown	9	Ground

Power

Stepper motor / Pololu driver: +12V, TBC mA
ATtiny85 / Neopixel ring: +5V, TBC mA

Bling

An awesome 24 RGB LED Neopixel ring!

@@ Line 13: / Line 13: @@
 Notes:
-* Not sure whether the ultrasonic sensor will be affected by spills and splashes. (Worth investigating whether clingfilm provides suitable protection, otherwise need to have some spares available and/or an over-ride mechanism).
+* Not sure whether the ultrasonic sensor will be affected by spills and splashes.
 * To prevent overheating of the Pololu driver and/or stepper motor, it is recommended that the stepper driver is disabled whenever the platform is stationary. (However, this does present a risk of not knowing the position if it should be knocked whilst disabled.)
@@ Line 20: / Line 20: @@
 ===Logical===
-The Pololu driver needs three signals: Enable, Step, Direction
+The Pololu driver needs three Arduino digital outputs: Enable, Step, Direction
-The ATtiny85 in the platform provides a "glass present" signal. (0 = no glass, 1 = glass prsent)
+The ATtiny85 in the platform provides a "glass present" signal. (0 = no glass, 1 = glass present)
+A further "mode" signal is used to select ultrasonic diagnostic mode (if low when power applied), or over-ride the ultrasonic sensor (if low during normal mode).
 ===Connections===
-* +12V
+{| class="wikitable"
-* Ground
+|-
-* ENABLE, STEP, DIRECTION
+! Wire colour !! 9 way D pin !!Signal
-* GLASS_PRESENT
+|-
+| Orange || 1 ||+5V supply to ATtiny85 and Neopixel ring
+|-
+| Red || 2||Stepper coil B
+|-
+| Blue || 3||Stepper coil B
+|-
+| Green || 4||Stepper coil A
+|-
+| Black || 5||Stepper coil A
+|-
+| Yellow || 6||Diagnostics / ultrasonic over-ride "mode" input
+|-
+| White || 8||"Glass present" output
+|-
+| Brown|| 9||Ground
+|}
+===Power===
+* Stepper motor / Pololu driver: +12V, TBC mA
+* ATtiny85 / Neopixel ring: +5V, TBC mA
 ===Bling===
 An awesome 24 RGB LED Neopixel ring!