BarBot/Components/Makerslide and Platform: Difference between revisions
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Notes: | Notes: | ||
* Not sure whether the ultrasonic sensor will be affected by spills and splashes | * 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.) | * 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=== | ===Logical=== | ||
The Pololu driver needs three | 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) | 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=== | ===Connections=== | ||
{| class="wikitable" | |||
|- | |||
! Wire colour !! Signal | |||
|- | |||
| Black || Stepper coil A | |||
|- | |||
| Green || Stepper coil A | |||
|- | |||
| Blue || Stepper coil B | |||
|- | |||
| Red || Stepper coil B | |||
|- | |||
| Orange || +5V supply to ATtiny85 and Neopixel ring | |||
|- | |||
| Brown|| Ground | |||
|- | |||
| White || "Glass present" output | |||
|- | |||
| Yellow || Diagnostics / ultrasonic over-ride "mode" input | |||
|} | |||
===Power=== | ===Power=== | ||
+12V, TBC mA | * Stepper motor / Pololu driver: +12V, TBC mA | ||
* ATtiny85 / Neopixel ring: +5V, TBC mA | |||
===Bling=== | ===Bling=== | ||
An awesome 24 RGB LED Neopixel ring! | An awesome 24 RGB LED Neopixel ring! | ||
Revision as of 23:11, 1 July 2014
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 | Signal |
|---|---|
| Black | Stepper coil A |
| Green | Stepper coil A |
| Blue | Stepper coil B |
| Red | Stepper coil B |
| Orange | +5V supply to ATtiny85 and Neopixel ring |
| Brown | Ground |
| White | "Glass present" output |
| Yellow | Diagnostics / ultrasonic over-ride "mode" input |
Power
- Stepper motor / Pololu driver: +12V, TBC mA
- ATtiny85 / Neopixel ring: +5V, TBC mA
Bling
An awesome 24 RGB LED Neopixel ring!