Many of you guys have seen my massive, crooked shooting, 3 gal antenna launching air cannon.
It's been fun, but it's time for an upgrade.
I've built a newer version all out pf PVC that sits on the shoulder like a bazooka, But it has much less air capacity than the last model.
- Cannon 2.0
- IMAG2690.jpg (2.15 MiB) Viewed 5592 times
On the original version, the time the air valve was open, was directly proportional to the time the trigger button was held down which can waste a lot of air from both mis-shooting with not enough air/trigger time and also wasting air with too much trigger time. In an effort to save air, I've decided to make a timed trigger for consistent air saving launches... but it hasn't come without minor challenges..
I've built a one-shot multivibrator (555 Timer) to time the trigger. which is great for forcing short trigger times to keep the valve open for 200ms. You can see here that a 124ms trigger time results in a 200ms valve open time.
- Single Shot - Good
- TEK00003.PNG (6.6 KiB) Viewed 5592 times
However if you hold the trigger, the valve closes for a very small amount of time before opening right back up.
- Multi Shot - Bad
- TEK00004.PNG (8.99 KiB) Viewed 5592 times
I'm trying to think of various, simple, ways to keep the trigger from being able to retrigger the valve within a certain about of time. Any ideas are welcome.
lol