Reed Switch

The reed switch provides an emergency on/off switch that allows divers around the vehicle to easily deactivate power to the thrusters. The Duke AUV team uses the RI-80 SMD Series switch. The reed switch works as a magnetic on/off device. When a magnetic field is placed over the switch, the reed switch flips to low resistance and allows current to flow. When the magnetic field is taken away, the switch flips to high resistance and no current is able to flow. Since the switch can only safely carry 350mA of current, the switch line does not directly interact with the thruster batteries. Instead, a 9V battery is connected in series with the reed switch, and the two open leads are placed across a Crydom relay. When the magnet is placed over the reed switch, the circuit is completed and 9 Volts drop over the relay. The 9V activates the relay, which in turn allows the positive +30V thruster power to reach the terminal blocks on the power board. The reed switch is podded inside of a 2 pin Subconn Low Profile series connector. The Subconn cable is mounted underneath the chassis against the bottom acrylic shell. A horseshoe magnet attached on the outside of the vehicle provides the magnetic field necessary to trip the reed switch.

Electronics Tube
Data Acquisition Card
Wireless Ethernet Card
Power Management Board
DC/DC Converters
Doppler Velocity Logger
Pressure Sensor
Power System
Floating Wireless
Reed Switch

Reed Switch Tech Manual