Traffic light simulator

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Project: Traffic light simulator
Featured: No
State Planned
Members Xopr
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Description School example of implementing traffic lights
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Some brain dump on charlieplexing 8(x3) traffic lights, 4(x2) pedestrian lights, 8 sensors. each number is a pin

        | 36  63     |
      45|            |
      67|            |
        |            |
      16|            |16  12
      72|            |72  34
--------'            '--------

                            37

51                          73

15

--------.            .--------
  45  16|            |16
  67  72|            |72
        |            |
        |            |12
        |            |34
        |     25  52 |

Main traffic lights use a Z-shape connection so that with 90 degrees turn, all combinations are used (bottom right: 1↔2↔3↔4)

light top right left bottom
Green.A 6→7 1→3 7→5 2→1
Orange.A 7→6 3→1 5→7 1→2
Red.A 6→5 1→4 7→4 2→3
Orange.B 5→6 4→1 4→7 3→2
Red.B 5→4 4→2 4→6 3→4
Green.B 4→5 2→4 6→4 4→3

Pedestrian light uses L-shaped pinout so that opposing lights carry the same signal. All 4 will draw a square so to speak, if placed on the intersection (bottom right: 6↔2↔7). One color will follow the L shape, i.e. red is clockwise, green is counter-clockwise around the intersection 'square'.

Arrow indicates red light, polarity reversed will make it green.

light top left right bottom
Red 1→6 7→1 6→2 2→7
Green 6→1 7→1 2→6 7→2

Remaining connections: 3→5 and 5→3, can be used for different layouts

Normal traffic lamp diameter is 210mm, small (bicycle) light is 80mm, big light is 300mm.
Die-cast metal cars are between 1:68 and 1:58 scale; assuming 1:64 scale
  • LED 3mm (3.8mm) h=5.3+0.8mm) would be 192mm(243mm) × 422mm
  • LED 5mm (5.8mm) h=8.7+1mm) would be 320mm(371mm) × 621mm

According to an article on 3 March 2016, yellow light times are increased to:

  • @80km/h → 5s
  • @70km/h → 4.5s
  • @50km/h → 3.5s

Some Traffic light brands:

  • Futura
  • Imtech BV (formerly (Groenpol) Peek) (Dutch standaard(?))
  • Alustar
  • Econolite (American vintage signals)
  • VIALIS Nederland Haarlem 'Classic'
  • Stoye

Some traffic automation brands:

  • Ko Hartog Verkeerstechniek B.V.
  • Siemens Nederland NV
  • Swarco Nederland BV
  • VIALIS

Straight intersection: arrange left, straight + right Uneven intersection: arrange left + straight, right