This is a portable demo we built for an agency show. It was also a test of the millisecond timing of the control system.

Here we see the programable sequence timer at work.
String releases the cars as the trigger is pressed
Variable delay allows cars to move into the right position before camera 1 fires
1-6 cameras speed ramp slow motion
6-12 freeze frame
12-16 speed ramp fast motion
These things are spring loaded and all action happens in just a few fractions of a second.
When I got a timing I liked, I launched the cars 10 times. This is the one I thought was best

These are the delays used:
#define INITIAL_DELAY 58000
#define DELAY_01_02 1000*12
#define DELAY_02_03 1000*13
#define DELAY_03_04 1000*14
#define DELAY_04_05 1000*15
#define DELAY_05_06 1000*16
#define DELAY_06_07 0
#define DELAY_07_08 0
#define DELAY_08_09 0
#define DELAY_09_10 0
#define DELAY_10_11 0
#define DELAY_11_12 1000*5
#define DELAY_12_13 1000*7
#define DELAY_13_14 1000*9
#define DELAY_14_15 1000*12
#define DELAY_15_16 1000*14