Tacho - Hall effect sensor

Created by: Lester Caine, Last modification: 15 May 2009 (08:10 UTC)

Options for a hall effect sensor are currently in the todo pile. Rapid have a reasonably priced sensor and some small ceramic magnets, both of which are waiting to be run up. The sensor is a simple 5V device so just solders direct to the end of the cable. It is almost not worth doing a PCB to link the two, a heatsrink sleave and p-clip are probably all that is needed. The problem is that this is a linear sensor and so may not work well as a 'switch' - this still needs investigating.

Datasheet

Rapid part numbers
82-1020 A1301 sensor
06-5962 Disk Magnet 10mm x 3mm
06-5966 Disk Magnet 14mm x 3mm

Many of the other sensor options from allegro have been marked as 'Not for new designs', but A3213 looks intersting but will probably only work with one or 6 pulses per revolution. 60 may be too fast for the sensor. Datasheet

Another area being looked at is the alternating pole magnetic strip, but that will need the flexability to select a variable number of pulses per revolution.