From 0fed71af049ce0fe2038f73d6b550923fb6a945f Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Sat, 26 Aug 2023 07:23:14 +0200 Subject: [PATCH] Readme: Reference another homemade P1P2 Adapter The adapter features USB and can be used as RPI hat. The design is open source and available here: https://github.com/siro20/P1P2_HBS_USBCdc_Modem Signed-off-by: Patrick Rudolph --- README.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/README.md b/README.md index 3bb926b..14072db 100644 --- a/README.md +++ b/README.md @@ -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)