Fan Component -> UART

ESPHome
1

Hi,

I have a 3-channel PWM generator for controlling fans. It supports to set the Duty values via UART TX/RX, so I added an ESP32 to it. I can set the value with uart.write.

I played with the fan component code, but I am stuck at basic steps cince I cannot retrieve the value I changed in the UI.

My code:

uart:
#- id: uart_1
tx_pin: GPIO08
rx_pin: GPIO10
baud_rate: 9600
debug:
direction: BOTH
dummy_receiver: false
after:
delimiter: “\n”
sequence:
- lambda: UARTDebug::log_string(direction, bytes);

output:

  • platform: template
    id: Ruck_125L_EC_Output
    type: float
    write_action:
    • uart.write: ‘D1:099’ # for testing

fan:

  • platform: speed
    name: Ruck 125L EC
    id: Ruck_125L_EC
    output: Ruck_125L_EC_Output
    on_speed_set:
    • uart.write: !lambda |-
      char buf[256];
      sprintf(buf, “D1:0%d”, Ruck_125L_EC->speed));
      return ((std::string) buf).c_str();

I dont know how to get the value so I tried above code, but get an error int the lamba part:

“/config/esphome/m5stampc3u-b.yaml:63:39: error: could not convert ‘std::__cxx11::basic_string(((const char*)((char*)(& buf))), std::allocator()).std::__cxx11::basic_string::c_str()’ from ‘const char*’ to ‘std::vector’”

The fan component entity is visible and I get the on_speed_set event. just dont know how the get the value…

Any hellp is highly appreciated :slight_smile:
best geetings

EDIT:
I manged to get the value with this code:

  • platform: speed
    name: Ruck 125L EC
    id: Ruck_125L_EC
    output: Ruck_125L_EC_Output
    speed_count: 100
    on_speed_set:
    • uart.write: !lambda |-
      char buf[256];
      sprintf(buf, “D1:0%d”, Ruck_125L_EC->speed);
      std::string s = buf;
      return (std::vector( s.begin(), s.end()));

Can anyone help me how to get a slider? Like in the first picture on the fan component documentation.

2

Post yaml please.

3

Hi,
thanks for the reply, which yaml code do you mean, exactly? I’ve posted the key code blocks from my ESPs yaml configuration.
But I managed to get it to work with:

on_speed_set:
  - uart.write:
      id: uart_1
      data: !lambda |-
              char buf[256];
              sprintf(buf,  "D1:0%d", Ruck_125L_EC->speed);
              std::string s = buf;
              return (std::vector<unsigned char>( s.begin(), s.end()));

Now struggling how to read data…

4

I think Nick is possibly hinting about correct code formatting. We can see you’ve tried but it’s not quite right. Please take a look at this and try to correct it. Otherwise it hurts our eyeballs too much to see proper indentation etc.

correct:
  like_this:
5

Ok thx, I will take a look tomorrow and edit it.

1 Like
6

What PWM generator are you using?