I'm planning to custom build a scalextric car controlled by an espruino. I have the track, but it's not delivering power correctly. As such, I'm hoping to use an espruino to control power to the onboard motor and potentially host the power supply on the vehicle. Initially I'm hoping to control this remotely, but later maybe have the vehicle automated.
All input gratefully received.
Looking forward to this. I used to have plans to digitise SCX cars in some way but I always talked myself out of it saying that I might as well just do it as a computer game rather than interacting with the real world.
You could do awesome things like simulating engine wear which causes the cars to drive slower, track the cars as they move around the track and do lap counting this way. If you're putting the Pixl on board the car then you could display what place in the race the cars are on the roof.
Sounds great! One of the Espruino MDBT42 breakouts and an FET would be a reasonably compact way to drive the car - I guess you just need to be careful that the power to the car wasn't so uneven that the board kept resetting (but a diode+capacitor would fix that).
Depending how much space you have I guess there might be the option of actually putting a battery on board the car, which would fix your power delivery issues?
Definitely like the idea of having the race position on the roof. I know digitised railways simulate acceleration curves rather than a more boolean on and off, that's definitely something that could be brought in.
The Espruino MDBT42 breakouts is a good shout, but my Pixl.js turned up this morning. I opted for it specifically for the Bluetooth integration, but couldn't say no to the screen as well. Longer term I'm hoping to add an accelerometer and Gyro to see if I can get it to be completely autonomous.
I would definitely be looking to on-board the power supply for the espruino and the motor, quite happy for these to be separate. The challenge I'm currently investigating is the power draw of the motors and the battery supply that would be needed to power it. It appears that traditionally the motors run on 12 volts for 18,000 rpm (they do require a gearbox). The flip side of this of course is going to be weight. I know that the newer cars have magnets to improve down-force, I'm hoping that the weight of the batteries may somehow be mitigated by removing this magnet.
You could use 3x LiPo batteries - you can get some quite small ones, but I guess you'd be looking at 50-100mAh of capacity for each to get anything that'd go in one of the cars. I wonder if it'd be enough...
For a source of them, I did see some reasonably small ones in disposable e-cigarettes, but they're still not exactly tiny! https://www.youtube.com/watch?v=P4IVNvcrUCk
Maybe a supercapacitor would be good enough to at least smooth out very uneven voltage from the rails?
Sorry for the delay have been busy doing the day job.
github page has been created here:
And: victim car has been purchased, although will require a bit of a refit to contain a whole pixl board. See images.
Wow, nice. There's more space in there than I remember!
I guess you could try and 3d print a new body for it... It it were a Pickup truck you could have the Pixl in the back :)
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