It’s been a while since the last blog post but fear not! With a whole new enthusiastic exec we’re hoping to push forward to society and start becoming more active on social media. Watch this space and we’ll keep you updated on the ongoings of the society over the coming year!
The HAB team is getting together with a group from the Computing Society to work on a joint ballooning project! As you may have guessed from the name, the payload on the first launch will be the always-popular Raspberry Pi. On its first flight, it’ll be connected to:
- A GPS module. You’ve got to be careful when choosing these: consumer-grade GPS modules are designed to stop working if they think they’re on an intercontinental ballistic missile, and have different ways of deciding whether they are. Pick the wrong one, and it’ll panic and shut down simply by going too high.
- A GSM module, which will attempt to text us the landing coordinates once the payload has descended close enough to the ground to pick up a mobile phone signal. Of course, the balloon will spend most of its flight too high above the ground to pick up the network, and the payload might land in a remote area with no signal, which is why it’ll also have…
- A radio transmitter, to send us GPS coordinates and photos while the balloon is flying.
- Speaking of photos, there’s a camera module to record video of the flight, which will also occasionally send pictures back to us on the ground.
Becky’s currently working on a cosmic ray detector that might also fly on this balloon, so we might be doing some actual science as well as taking pretty pictures! (On the other hand, it might be more sensible to fly the cosmic ray detector on the second flight, once we’ve had some practice and are less likely to lose the payload…)
Stay tuned for updates on this blog about what the joint ballooning team is up to! If you’re really keen and want to follow the project’s progress in minute detail, the code is all on Github.
So we spent some of the session on Saturday playing around with the servos for Hummingbird, we started by taken one of them apart so we could solder a new wire in there and get some feedback on the current position:
We then spend the rest of the day wiring up the two servos, one for the x-axis and one for the y-axis, creating a circuit and attaching it to the Arduino so we could control them independently:
As you can see, the servos are currently being controlled by a 2D joystick; this is just a concept idea, eventually that control will be replaced by a gyroscopic and magnetic sensor which will tell the servos which direction the motor needs to point to stay on course.
See them in action below:
Now we just need to order those gyroscopic and magnetic sensors!
National Instruments is the industry leader in automated test equipment and virtual instrumentation software. They make software and hardware tools used by scientists and engineers all over the world to acquire and process experimental data and to automate industrial processes.
- A dual-core ARM Cortex-A9 processor at 667MHz, which gives us a decent amount of processing power.
- A Xilinix Z-7010 FPGA – this chip can be reconfigured to carry out a complicated operation of your choice in a single clock tick. Using an FPGA would usually involve learning esoteric languages like VHDL, but the myRIO’s FPGA can instead be programmed using NI’s graphical programming tool LabVIEW.
- A total of 48 digital I/O lines and a total of 10 analog input lines – the latter can sampled at up to 500 kilosamples/second. While the 12-bit ADC doesn’t quite have the resolution of the ADCs found on dedicated DAQ boards, it won’t be a limiting factor in what we’re using it for this year.
- Wi-Fi connectivity: the option of one fewer cable to trip over!
- A button.
It’s a very powerful (but heavy – it’d be half the vehicle’s mass!) option for Hummingbird’s flight computer. Since it can handle both control and data acquisition, it’ll also be useful for test-firing the torch igniter: the test team can set everything up, leave the lab, and command it from a safe distance to begin a test-fire and save data to internal memory, all while relaying important information to us.
We’re looking forward to seeing what we can do with this new piece of hardware – and in the longer term, we look forward to continuing to work with National Instruments on exciting spaceflight-related projects!
We had a surprise delivery today of our personalised polo shirts. We think they look great!
Here you can see Chris, our Chief Engineer, modelling the Warwick Rockets Spring 2015 collection:
This is the first batch, so drop us a message if you want one
Over the holidays, Joe (seen in the first picture here with the excitingly stripy rocket) put his model-making skills to use by assembling a foamcore model of Hummingbird. The gimbal even moves! I’ve just been told it wasn’t actually supposed to move, so I should probably stop playing with it…
The model pointed out something that’d be useful to change: the original concept had a single platform where the electronics would sit, but we now reckon it’d work better to have a second platform just for the flight computer. Of course, unlike the version in the model, the roll cage needs to be extended over this too.