How low can you go?
Depends how hard you are prepared to try…
All from e-bay including shipping (mostly from China):
CP2021 TTL board: $2.18
Arduino Pro Mini: $2.97
Mini Solderless Breadboard: $13.30 for 10
LEDs – 100 x 3mm, 5 mixed colours $2.18
resistors – 100 for $1 Maybe need two values – $2
tactile switches $1.35 for 20
10K pot – $2.74 for 10
LDR £1.39 for 20
Total for 10 – £74.46 and they get a kit with enough parts to make any number of easy projects using analog and digital input and output, with all they need to re-program and expand when they get home. You may well be able to get a little lower with some persistence.
Ugi
