Aircon: README

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+
+
+TIM1   timing of IR remote control
+TIM2   MODBUS timing
+TIM3   DS18B20 one-wire bus timing: CH1 drives DMA1, CH2 drives the line
+TIM5   PWM: CH1 for fan control, CH2 for IR RC carrier
+
+USART1 debugging
+USART3 MODBUS
+
+DMA1   DS18B20 one-wire bus sampling
+
+
+                          Blue Pill pinout
+                       +--------------------+
+                       | VBATT         3.3V |
+BluePill LED           | PC13           GND |
+                       | PC14            5V |
+bypass opto-coupler    | PC15           PB9 |
+                       | PA0            PB8 |
+                       | PA1            PB7 |  TIM3 CH2 - IR LED*
+                       | PA2            PB6 |  TIM3 CH1 - fan control opto-coupler
+                       | PA3            PB5 |
+                       | PA4            PB4 |
+                       | PA5            PB3 |
+RS485 TX enable                | PA6           PA15 |
+TIM3_CH2 - DS18B20 bus | PA7           PA12 |
+bypass LED* (green)    | PB0           PA11 |
+RC active LED* (red)   | PB1           PA10 |  RXD1 - debugging console
+TXD3 - RS485           | PB10           PA9 |  TXD1 - debugging console
+RXD3 - RS485           | PB11           PA8 |
+                       | RESET         PB15 |
+                       | 3.3 V         PB14 |
+                       | GND           PB13 |
+                       | GND           PB12 |
+                       +--------------------+
+
+Interface connector
+
+       heat exchanger +24V
+       heat exchanger GND
+       heat exchanger bypass servo
+       heat exchanger fan control (IN1)
+       -
+       -
+       -
+       temperature sensors VCC
+       temperature sensors GND
+       temperature sensors data bus