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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
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