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Readme: Reference another homemade P1P2 Adapter #79

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Readme: Reference another homemade P1P2 Adapter #79

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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -78,6 +78,9 @@ Build P1P2-adapter yourself (MM1192/XL1192): schematics and pictures for the MM1

Build P1P2-adapter (MAX22088): Alternatively, you may build a circuit based on the newer MAX22088 IC from Maxim. Be warned that it is difficult to solder: it's only available as a 4x4mm 0.5mm pitch TQFN-24 package. The MAX22088 is powered directly from the P1/P2 bus (take care - we don't know how much power Daikin's P1/P2 bus may provide, perhaps max 60mA) and is able to power the Arduino Uno (max 70mA at Vcc=5V). PCB and schematic files for a [MAX22088-based design](https://github.com/rothn/P1P2Adapter) are made available by Nicholas Roth. His design does not provide galvanic isolation from the P1P2 bus, but that is OK if you connect only via WiFi or ethernet.

Build P1P2-adapter (Raspberry Pi Pico): Alternatively, you may build a circuit based on the Raspberry Pi Pico. It's available as RPI hat, but also works in standalone mode powered over USB.
The design does provide galvanic isolation and is available here: [P1P2 Rpi Hat](https://github.com/siro20/P1P2_HBS_USBCdc_Modem).

**Older design: P1P2-adapter**

![P1P2-adapter PCB](circuits/P1P2adapter_topside.png)
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