Yes 454 us. Mea culpa.P_Monty wrote:PiGraham, at 2200 packets per second, isn't that one per 450 microseconds, not milliseconds? If so (and as I'm currently full of snot due to a rotten cold my brain may not be working properly) then quite a few packets could be received...
Just a note: I've heard it said that the timers and lane changers don't always register well there - because the tail might swing out a little after the bend. No idea if it's a myth or not...iambenb wrote:I'd probably set it up so that the start line was directly after a corner, so the cars would not be going at full speed.
) was to build a raspi onto a (slow moving) chassis so it can be driven around, perhaps using several controllers to do extra functions. Should be just enough track power on the standard digital sets...That sounds interesting. Are you aware of 'SSD Pro'?Ravenous wrote:Just a note: I've heard it said that the timers and lane changers don't always register well there - because the tail might swing out a little after the bend. No idea if it's a myth or not...iambenb wrote:I'd probably set it up so that the start line was directly after a corner, so the cars would not be going at full speed.
Also the "All New Really Useful Technical Links" sticky on the slotforum site I linked above seems to have a lot of stuff... too much really.
One of the many projects I had in mind (but have not even started yet
Easy enough to stick a scope onto a IR sensor and see exactly what the car is transmitting...aTao wrote:I'm real not to sure about the 2,200 packets per second. I will need to see the Scalextrc (Hornb) specification. The people on the web site above dont seem to be top rate digital engineers.
AFAIK
The packet length (therfore the packet frequency) depends on the car ID (ID range = 1..6)
There is 1 start bit, 2 padding, then 1 bit per car#
Padding bits and car ID bits are opposite phase of start bit
If start bit = 0 then lane change is requested
If start bit = 1 then no lane change.
bit length seems to be 48uS
so 192uS <= packet time <= 432uS
2.3kHz <= packet frequency <= 5.2kHz
Again I think I would prefer to get the info from the horse's mouth since information so far is conflicting (mix ups between fixed mark/space ratio vs fixed start bit length vs fixed frequency)
I have an occasional daydream to do a Scaley version of the various train controllers people talk about (for some reason I fancy scalextric but not trains) - just for fun. It wouldn't be a racing car - it would be too heavy (and would need to reboot if it came off the track!) - just a simple cart that trundles around and maybe has a lifting arm or alternate lighting schemes.PiGraham wrote:What sort of extras did you have in mind that warrant a big board like a Pi?
