https://github.com/rivques/drag-racer-track-v2
A successor to the mini-drag-racetrack.
https://github.com/rivques/drag-racer-track-v2
Last synced: 3 months ago
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A successor to the mini-drag-racetrack.
- Host: GitHub
- URL: https://github.com/rivques/drag-racer-track-v2
- Owner: rivques
- License: mit
- Created: 2025-01-13T18:35:50.000Z (5 months ago)
- Default Branch: main
- Last Pushed: 2025-03-03T19:14:31.000Z (3 months ago)
- Last Synced: 2025-03-03T19:36:25.586Z (3 months ago)
- Language: Python
- Size: 18.2 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# drag-racer-track-v2
A new and improved version of [mini-drag-racetrack](https://github.com/rivques/mini-drag-racetrack).
## Contact Me
While this racetrack was designed to be maintainable by people other than me, please don't hesitate to contact me if you run into an issue that these docs don't cover.
You can open an issue on this repository or email me at `web (at) rivques (dot) dev`.
## How To Use
To be written.
## Assembly (from storage)
## Assembly (from scratch)
### Motor controller
1. Solder an Adafruit Perma-Proto Bonnet Mini according to the [wiring diagram](circuit/outputs/motorcontrollerwiring.png). [Here](doc-pics/motorcontroller-bottom.jpg) are [some](doc-pics/motorcontroller-top-withoutpico.jpg) [pictures](doc-pics/motorcontroller-top-withpico.jpg) of what it should look like (albeit without the battery and switch).
2. Print out the (yet-to-be-designed) front pieces.
3. Mount the servo motors...
TODO: finish this section once CAD happens
### Mainboard
1. If you're using a generic OLED instead of an Adafruit OLED, bridge the jumpers on the mainboard PCB accordingly.
2. Solder headers and breakout boards to the mainboard PCB according to the [schematic](circuit/outputs/mainboard.pdf). I reccommend soldering female headers to the board for the Pico, RJ45 breakout and OLED but you can choose to solder them directly to the board if you wish.
3. Run a bodge wire from GP20 on the unused pins header to an SDA pin. This corrects for the board incorrectly wiring GP22 to SDA.
## Bill Of Materials
* 2x [Adafruit beam-break 3mm sensors](https://www.adafruit.com/product/2167)
* 4x [SparkFun RJ45 breakouts](https://www.sparkfun.com/sparkfun-rj45-breakout.html) with [SparkFun RJ45 conectors](https://www.sparkfun.com/rj45-8-pin-connector.html)
## Project Proposal
Available at [this Google doc](https://docs.google.com/document/d/1fPM3jAb2btpLcQTNEUYPZXAGJ7guPSih1aArkj4l1_s/edit?usp=sharing).
## Circuit Diagram
### Commmunication
The three modules communicate over straight-through CAT-5 (aka Ethernet) cable. This is a convenient, flexible multi-conductor cable.
This pinout is constructed to allow near-unambiguous determination by the main processor of 1. if a cable is connected and 2. if the cable is connected to the motors or the screen.
To do this it can do the following:
```mermaid
flowchart TD
Start-->
Watch7{Watch pin 7}
-->|High|Nothing([Nothing Connected])-->
Watch7
-->|Low|Something[Something Connected]
-->Set5[Set 5 HIGH]
-->Watch3{Check Pin 3}
-->|High|Controller([Connected to Controller])
Watch3-->|Low|Motor([Connected to Motor])
```
This approach does fail if the smart controller is plugged in while the reset button is pressed. However, it should catch most crossed wires.
The pinout is as follows (assuming T568A terminations):
#### Main-Motor (purpose and direction from Main's perspective):
RJ-45 Pin # | T568A color | Pico pin | Purpose | Direction | Notes
---|---|---|---|---|---
1|Wh/Gr|GND|GND|Bidirectional|Shared ground reference
2|Gr|GP0|TX|OUTPUT|UART 8N1@9600 baud
3|Wh/Or|GP2|Discrim|INPUT|Tied to GND at Motor
4|Bl|NC|NC||
5|Wh/Bl|3V3OUT|3V3|OUTPUT|
6|Or|GP1|RX|INPUT|UART 8N1@9600 baud
7|Wh/Br|GP3|Presence|INPUT|Tied to GND at Motor
8|Br|NC|NC||
#### Main-Button Controller (purpose and direction from Main's perspective):
RJ-45 Pin # | T568A color | Pico pin | Purpose | Direction | Notes
---|---|---|---|---|---
1|Wh/Gr|GND|GND|OUTPUT|
2|Gr|GP17|LED_RACE|OUTPUT|
3|Wh/Or|GP8|Discrim|INPUT|Tied to LED_RACE at Controller
4|Bl|GP4|RESET|INPUT|
5|Wh/Bl|GP16|LED_ARM|OUTPUT|
6|Or|GP5|ARM|INPUT|
7|Wh/Br|GP7|Presence|INPUT|Tied to GND at Controller
8|Br|GP6|RACE|INPUT|
To be created.
### Motor Controller Board
The motor controller is build on an Adafruit Perma-Proto Mini Bonnet. That board is designed for a Pi Zero but I take advantage of internal
connections to make it work for this board. As a result of this, the labels on the board have no meaning. The schematic and wiring diagrams are in
/circuit/output.