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diff --git a/radiator-plc/DOCS/plc_notes.txt b/radiator-plc/DOCS/plc_notes.txt
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+
+STM32 pin assignments
+
+PA0 X4
+PA1 X3
+PA2 RS422 pin 4
+PA3 RS422 pin 1
+PA4
+PA5
+PA6 RS422 pin 3
+PA7 Via 472 to Run switch
+PA8 Y1
+PA9 RS232
+PA10 RS232
+PA11 Y2
+PA12 Y3
+PA13 SWDIO
+PA14 SWCLK
+PA15
+
+PB0 10k to ground
+PB1 AD1 via condiitoning (conditioning removed (apart from zener) and with 10k pull up)
+PB2 AD0 via conditioning
+PB3
+PB4
+PB5
+PB6
+PB7
+PB8
+PB9
+PB10
+PB11
+PB12
+PB13
+PB14
+PB15 X2
+
+PC0
+PC1
+PC2 Err LED
+PC3 Run LED
+PC4 X5
+PC5
+PC6 X1
+PC7 X0
+PC8 24V detect
+PC9 Y0
+PC10
+PC11
+PC12
+PC13 tamper RTC
+PC14 OSC32 (no sign of xtal)
+PC15 OSC32 (no sign of xtal)
+
+PD0 Y4
+PD1 Y5
+PD2 Y6
+PD3 Y7
+PD4
+PD5
+PD6
+PD7
+PD8
+PD9
+PD10 X13
+PD11 X12
+PD12 X11
+PD13 X10
+PD14 X7
+PD15 X6
+
+PE0
+PE1
+PE2
+PE3
+PE4
+PE5
+PE6
+PE7
+PE8
+PE9
+PE10
+PE11
+PE12
+PE13
+PE14
+PE15
+
+VBAT
+BOOT0 strapped by R16/R72
+
+
+