WHEELCHAIR REVERSING ALARM
Our client was concerned about reversing her high backed wheelchair and wanted an alarm which would
activate when there were obstructions behind such as people or objects.
An ultrasonic reversing alarm electronics kit by Belgian
company Velleman was purchased from Maplin Electronics. This uses a similar principle to reversing alarms on motor vehicles. The kit was
assembled and installed in two boxes - one containing the electronics and mounted at the rear of the wheelchair, and a second narrow
box mounted under the arm of the wheelchair, containing the battery, on/off switch and sounder.
After some use, it became clear
that the audible alert could be drowned out in noisy traffic, so an additional sounder and driver circuitry was added so
the volume could be increased at the flick of a switch.
Harrogate and Ripon Group