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 | 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 !! 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=== | ===Bling=== | ||
An awesome 24 RGB LED Neopixel ring! | An awesome 24 RGB LED Neopixel ring! | ||
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!