Cardinal flutter device7/31/2023 The compass did not respond, as it should. When I first assembled this circuit onto the board it did not function properly. The close up photograph, in figure 8, shows two jumpers that need to be soldered in, that supply power and ground to the 1490 compass. 9V battery cap is wired into the Vin positions, and finally a switch is wired on to the pcb in the lower left hand corner. Capacitors C3 and C4 are 22 uF capacitors. Four sub-miniature LED's are soldered into the B0 through B4 positions, with the positive lead of the LED orientated on the right side with the board as shown in figure 4. This circuit may be wired onto our Navigation pc board, see figure 7.įigure 6, shows the minimum components of figure 5 mounted and soldered to the pc board, figure 7. Any tilt greater than 12 degrees will create directional errors. In addition the built in hysteresis prevents flutter when near a switching direction. ![]() The dampening prevents over swinging the direction. The sensor is dampened to approximate the speed of a liquid filled compass. The 1K resistors limit the current flowing through the LED's to about 5 mA. The LED's used in the circuit are red micro-miniature type that operate using little current. I used a 7805 to regulate the 9V battery to a constant 5 volts. ![]() The sensor will operate supply voltages from 5 to 18 volts. As are the number 1 leads connected to +5 volts Vcc. Notice that all the number 2 ground leads are tied together. The intermediate directions light two LED's as shown in figure 6. ![]() Each cardinal position on the compass lights one LED. The sensor is drawn in the schematic as if you are looking through the top of the sensor to the 12 leads below. The first test circuit (see figure 5) is about the simplest circuit that can be designed around the device.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |