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Gadget Freak Case #124: Controlling the Rocket Fire
William Grill's latest gadget helps control the accidental launch of model rockets
Design News Staff -- Design News, August 7, 2008
William Grill created a gadget that helps control the firing of model rockets. The device provides basic rocket igniter functions, including an igniter “fuse” monitor, audio input and an LED display. The gadget also features a “DeadMan” button (which helps avoid an unintended launch) and a “Fire” button that sends the rocket into the sky. The goal of this inexpensive tool is to reduce the risk of pre-launch ignition and provide a controlled sequence from setup to launch. A small, inexpensive controller manages the DeadMan and Fire buttons.
| Amt | Part Description | Allied Part # |
| 1 | 47Ω ¼W (1/8W may be substituted) | 832-0153 |
| 2 | 100Ω ¼W (1/8W may be substituted) | 832-0202 |
| 1 | 2K Ω ¼W (1/8W may be substituted) | 832-0400 |
| 1 | 1K Ω ¼W (1/8W may be substituted) | 832-0356 |
| 1 | 22K Ω ¼W (1/8W may be substituted) | 832-0585 |
| 1 | 30K Ω ¼W (1/8W may be substituted) | 832-0611 |
| 1 | Piezoalarm (Piezo-element or low-voltage alarm can be used) | 623-2024 |
| 1 | PIC12F508,508A 12F508A, PDIP may be installed in 10F2xx series or other compatible controllers, 12F508 PDIP used in prototype | 12C186 |
| 2 | SPST button MPS103-C 3 amp minimum current rating, N.O. | 61F1213 61F1214 |
| 1 | LED | 782-0030 |
| 1 | 1.0 µF*16V (3.3 µF, 10V or larger may be used) | 507-0676 |
| 1 | Perf board 1 x 3 inch pad 1 side only solderable NPT pads both sides or other packaging | 977-0088 |
| 1 | 4-AA holder Keystone 2476/snap on may be portion of purchased ignitor | 31C0581 |
| Get the Build Instructions | ||
Talkback
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This is a test
test - 2008-22-8 04:34:21 EDT -
The author can be reached at :
contact@riverheadsystems.com
I can provide the *.asm and *.hex files and answer any questions about this or my other projects.
William GriLL - 2008-11-8 09:50:03 EDT -
I've tried twice to get the PDF, but it says it's corrupted.
Aaron - 2008-11-8 05:54:18 EDT
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