C08
Well-Known Member
Mine has developed a strange fault in that it seems locked onto a set of bearings in the memory. I cannot seem to get it to function properly- any ideas on this.
Autohelm Digital Handbearing Compass
- Thread starter C08
- Start date
sailorman
Well-Known Member
remove the battery might help re set it
Boo2
Well-Known Member
Does anyone know which compass chip this device used to use ?
Boo2
Boo2
eastlaked
Active Member
From memory, I think it didn't use a compass chip, as it was designed and built about a decade before they became available. I think it uses a ring of magnetic material and then three coils, two at right angles and one at 45 degrees. The micro controller would "ping" one coil and the time for the magnetic material to saturate / desaturate (detected by the other coils) was used to calculate the angle of the earths magnetic field (which would enhance or reduce the saturation / desaturation time).
David.
David.
cliff
Well-Known Member
Assuming you have switched on the compass and taken 5 bearings, these will be stored in the first 5 memory locations out of a total of 9 available. If you keep taking bearings and use the remaining 4 memory locations the display will flash and the 10th reading wil be written to location 1.
If no buttons arc pressed for 4 minutes, display will ‘go to sleep’ to save power. All memories will be protected.
Pressing MEM or TIMER restores display; pressing red button also takes new bearing.
After a further 6 minutes. compass will switch off completely and all bearings will be erased. To protect bearings for up to 10 hours, leave timer running.
I suspect if you are storing bearings for more than 10 minutes you have set the timer running. To stop the timer press the timer button and check display if 0:00 then press timer again - timer will start - press again timer will display elapsed time, press again timer will reset to 0:00 then press MEM to revert to compass mode. Now set the compass down and do do something for 15 minutes - after 4 mins screen goes to sleep after another 6 minutes the compass shuts down completely and all memory dumped UNLESS the timer is running.
If no buttons arc pressed for 4 minutes, display will ‘go to sleep’ to save power. All memories will be protected.
Pressing MEM or TIMER restores display; pressing red button also takes new bearing.
After a further 6 minutes. compass will switch off completely and all bearings will be erased. To protect bearings for up to 10 hours, leave timer running.
I suspect if you are storing bearings for more than 10 minutes you have set the timer running. To stop the timer press the timer button and check display if 0:00 then press timer again - timer will start - press again timer will display elapsed time, press again timer will reset to 0:00 then press MEM to revert to compass mode. Now set the compass down and do do something for 15 minutes - after 4 mins screen goes to sleep after another 6 minutes the compass shuts down completely and all memory dumped UNLESS the timer is running.