aircon/README

   1
   2
   3 TIM1    timing of IR remote control
   4 TIM2    MODBUS timing
   5 TIM3    DS18B20 one-wire bus timing: CH1 drives DMA1, CH2 drives the line
   6 TIM5    PWM: CH1 for fan control, CH2 for IR RC carrier
   7
   8 USART1  debugging
   9 USART3  MODBUS
  10
  11 DMA1    DS18B20 one-wire bus sampling
  12
  13
  14                            Blue Pill pinout
  15                         +--------------------+
  16                         | VBATT         3.3V |
  17 BluePill LED            | PC13           GND |
  18                         | PC14            5V |
  19 bypass opto-coupler     | PC15           PB9 |
  20                         | PA0            PB8 |
  21                         | PA1            PB7 |  TIM3 CH2 - IR LED*
  22                         | PA2            PB6 |  TIM3 CH1 - fan control opto-coupler
  23                         | PA3            PB5 |
  24                         | PA4            PB4 |
  25                         | PA5            PB3 |
  26 RS485 TX enable         | PA6           PA15 |
  27 TIM3_CH2 - DS18B20 bus  | PA7           PA12 |
  28 bypass LED* (green)     | PB0           PA11 |
  29 RC active LED* (red)    | PB1           PA10 |  RXD1 - debugging console
  30 TXD3 - RS485            | PB10           PA9 |  TXD1 - debugging console
  31 RXD3 - RS485            | PB11           PA8 |
  32                         | RESET         PB15 |
  33                         | 3.3 V         PB14 |
  34                         | GND           PB13 |
  35                         | GND           PB12 |
  36                         +--------------------+
  37
  38 Interface connector
  39
  40         heat exchanger +24V
  41         heat exchanger GND
  42         heat exchanger bypass servo
  43         heat exchanger fan control (IN1)
  44         -
  45         -
  46         -
  47         temperature sensors VCC
  48         temperature sensors GND
  49         temperature sensors data bus