{"id":1534,"date":"2021-01-20T01:04:20","date_gmt":"2021-01-20T06:04:20","guid":{"rendered":"https:\/\/teakdata.com\/blog\/?p=1534"},"modified":"2021-01-22T00:05:43","modified_gmt":"2021-01-22T05:05:43","slug":"water-rocket-with-raspberry-pi-v2","status":"publish","type":"post","link":"https:\/\/teakdata.com\/blog\/water-rocket-with-raspberry-pi-v2\/","title":{"rendered":"Water Rocket with Raspberry Pi \u2013 V2"},"content":{"rendered":"\n

You can see the first version of the rocket here: Water Rocket with Raspberry Pi – V1<\/a><\/p>\n\n\n\n

As explained in V1, the parts needed for water rocket are: Bottle, Nozzle, Fins, Release mechanism, Head of rocket (holding parachute & flight computer), Parachute and Flight Computer (hardware and software)<\/p>\n\n\n\n

AircommandRockets website has tons of amazing tutorials related to water-rockets:\u00a0http:\/\/www.aircommandrockets.com<\/a><\/p>\n\n\n\n

For V2 we have redesigned the Head of the rocket. In V1 we have used the simplest head, a cutout from a plastic bottle with the inside mechanism of cardboard\/foamboard. The new head cone is completely 3D printed, easily replaceable after a crash.<\/p>\n\n\n\n

V2 has a completely 3D printed head<\/p>\n\n\n\n

\"water<\/a><\/figure>\n\n\n\n

The door is fixed with a metal rod created from a paperclip.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – raspberry pi<\/figcaption><\/figure>\n\n\n\n

And the components (flight computer, parachute release mechanism, sensors) are all mounted on a 3D printed part.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – raspberry pi<\/figcaption><\/figure>\n\n\n\n

In the next picture you can see the battery with the charger on top, and on the side the raspberry pi zero with the camera.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – raspberry pi<\/figcaption><\/figure>\n\n\n\n

In the next picture we have the motor that is releasing a rubber band opening the parachute door. Also on the bottom part we have the accelerometer and the pressure sensors.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – raspberry pi<\/figcaption><\/figure>\n\n\n\n

In the next picture we have the parachute compartment, with rubber bands used to push the parachute out when the door is released.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – raspberry pi<\/figcaption><\/figure>\n\n\n\n

We had some fun sanding the 3D parts to nicely fit into the head of the rocket.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – assembly<\/figcaption><\/figure>\n\n\n\n

Flight Computer Software<\/h2>\n\n\n\n

In order to release the parachute of the rocket after the descent is detected we are using raspberry pi and accelerometer sensors. The software is simple, written in python.<\/p>\n\n\n\n

Full source code can be found here:\u00a0https:\/\/github.com\/smarcu\/dnd-water-rocket-raspberry<\/a><\/p>\n\n\n\n

Rocket Head 3D model<\/h2>\n\n\n\n

https:\/\/www.tinkercad.com\/things\/ccj2mbzvFvB<\/a><\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – 3d model<\/figcaption><\/figure>\n\n\n\n

Launches<\/h2>\n\n\n\n

With the V2 we had launched several times, we still had some software algorithm problems (the descent detection was not working properly).<\/p>\n\n\n\n

We had several crashes, but the head was quite solid, the cone and the shell absorbed most of the shock and the inner components were not affected.<\/p>\n\n\n\n

\"water<\/a>
water rocket v2 – crash<\/figcaption><\/figure>\n\n\n\n

The best launch we had in the beautiful county of Hateg!<\/p>\n\n\n\n

\"water<\/a>
water rocket raspberry pi<\/figcaption><\/figure>\n\n\n\n
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