Having taken inspiration from the spectacular lighted dress which
@Manuela made a while ago I have just finished knitting four hats for the younger GC. The boys 13 and 9 will get the plain ones and the girls 15 and 13 will have the bobbles.
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They all have a button battery and two LEDs from a kit bought from
Kitronik. White LED in the red and light grey hats, blue LEDs in the charcoal and purple hats.
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It's not particularly difficult to. You have to use the special conductive thread and with knitted fabric it was important not to pull the thread tight between connections, although the connections themselves need to be secure to get a good circuit.
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The hardest part was sorting out the path of the threads; it has to be +ve to -ve and the threads must not cross. This turned out to be the simplest for what I wanted.
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As I haven't included switches it will be necessary to insert and remove the batteries to turn the LEDs on and off so I need to source a means of easily pushing the battery out, plastic or wooden. Terry suggests the wooden stirrers which come with take-away coffees. I just need to source them!