Our client is a young girl with cerebral palsy, who struggled with the buttons on some of her toys. Adaptations were made to take commercially available "Jelly Bean" switches which are very easy to operate.
This toy is an Early Learning Centre musical drum with light effects, where switches were wired in parallel with the three buttons around the stem of the drum which change the type of sound created, and a forth wired into the drum shock sensor.
Due to the nature of the shock sensor (which generates a slight voltage when a ball bearing hits it), it was necessary to add a battery and this was housed in a small external battery box, along with the 3.5mm mono sockets to take the four Jelly Bean switches.  
Finally, a sheet of white perspex forms a "white board" for use with dry marker pens to help the child remember what button does what.
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Harrogate and Ripon Group