Hardware Suppliers

Sheepwalk Electronics

There are various Dallas Maxim 1-Wire interface adapters and sensors available from Sheepwalk Electronics. Some kits are available unassembled.

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Ciseco

There are various Pi-related cards and accessories available from Ciseco. Assembly instructions can be found here and the support forum is here.

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Velleman

Velleman do not supply any Pi-specific boards or accessories but they do sell generic USB devices. I have used the K8055 and K8064. Their website is at Velleman. Most boards can be bought either assembled or in kit form.

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RS Components

One of the two main-stream suppliers of Pis. RS also sell every conceivable component that you might need. Can be pricey but if you have an account, next-day postage is free.

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Farnell

The other of the two main-stream suppliers of Pis. Farnell also sell every conceivable component that you might need.

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ModMyPi

Supplier of well-made Pi cases and other accessories (GPIO, USB devices, SD cards, etc.).

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Quick2Wire

Supplier of Pi interface boards. Not yet tried out.

Pi-Supply

Supplier of Pi intelligent power switching kits for your Pi.