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+
+A0 <- pressure sensor
+A2 <-> one wire bus
+A11 -> yellow LED (OD)
+A12 -> green LED 1 (OD)
+A15 -> green LED 2 (OD)
+
+B1 -> PIC RESET
+B3 -> red LED (OD)
+B6 <- PIC B6 LED_C (from A0, OT from thermostat)
+B7 <- PIC B7 LED_D (from A1, OT from boiler)
+B8 -> PIC A6 GPIO_A (to A3, OT to boiler)
+B9 -> PIC A7 GPIO_B (to A4, OT to thermostat)
+B10 -> PIC RX
+B11 <- PIX TX
+
+C13 -> onboard LED (OD)
+
+A2 -> MR3020 TX
+A3 <- MR4020 RX
+RST <- MR3020 GPIO5
+
+
+