Engine Control Unit (DARE)The engine control unit was build by the electronics team within Delft Aerospace Rocket Engineering (DARE). It is designed to control the valves of a hybrid rocket engine during the filling procedure and the launch of the Stratos II+ rocket.
The aluminium housing (which is normally closed with a lid) was used to protect the electronics against vapour and shield the electronics. As the system also houses a Flight Termination System (FTS) receiver, we wanted to shield it properly.
The semi-circular shape is used so it can be mounted directly to the tube that forms the rocket body.
Flight Termination System (DARE)This system is the transmitting side of the Flight Termination System used within DARE. The system is used to turn of the engine of a rocket in flight whenever an anomaly happens. It is manually operated (often assisted by an optronics system) and uses an RF uplink that is normally on.
In case the receiver loses the signal, or an active termination is sent, the engine is turned of (or in professional rockets a pyrotechnic charge is used).
Launch Box (DARE)The launchboxes are used within DARE to ignite the engine of a rocket from a safe distance. The set consists of two boxes (Gabriel and Lucifer). Gabriel is located at a safe distance from the rocket and communicates with Lucifer over an RS485 link.
The set accomodates communication with the rocket while it is in the tower, as well as a data link for peripheral systems (like a wheater station).
Several safety features are built into the device. An example is the single key that needs to be taken out of Lucifer and put into Gabriel before a rocket engine can be ignited.
LPT Breaktout BoardMy CNC computer uses the old-school LPT port to communicate with the electronics.
This home made board provides galvanic isolation between the electronics and the computer to protect both systems in case of failure of either one of them.
Early PCB design (Etched, 2010)This image shows one of my first PCB designs. Back in the days it was more affordable to etch a PCB at home. With the trough-hole components the resoluts were easily sharp enough. Nowadays SMD components are much more common and ordering a PCB from a manufacturer is often the way to go.
For single-sided PCBs however I still use the CNC-machine