adding link for max31856
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@ -35,7 +35,7 @@ Turns a Raspberry Pi into an inexpensive, web-enabled kiln controller.
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| Image | Hardware | Description |
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| ------| -------- | ----------- |
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|  | [Raspberry Pi](https://www.adafruit.com/category/105) | Virtually any Raspberry Pi will work since only a few GPIO pins are being used. |
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|  | [MAX 31855](https://www.adafruit.com/product/269) | Thermocouple breakout board |
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|  | [MAX31855](https://www.adafruit.com/product/269) or [MAX31856](https://www.adafruit.com/product/3263) | Thermocouple breakout board |
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|  | [K-Type Thermocouple](https://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=39) | Invest in a heavy duty, ceramic, k-type thermocouple designed for kilns |
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|  | Breadboard | breadboard, ribbon cable, connector for pi's gpio pins & connecting wires |
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|  | Solid State Relay | Zero crossing, make sure it can handle the max current of your kiln. Even if the kiln is 220V you can buy a single [3 Phase SSR](https://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=331). It's like having 3 SSRs in one. Relays this big always require a heat sink. |
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