How to transfer data from uart

ESPHome
22

hi all
can someone tell me what is wrong with my code ?

esp dont put values in templates , rawstring is ok
my code:

uart:
  baud_rate: 9600
  tx_pin: GPIO17 
  rx_pin: GPIO16
  debug:
    direction: RX
    dummy_receiver: true
    after:
      delimiter: "\n\r"
    sequence:
      - lambda: |-
          UARTDebug::log_string(direction, bytes);
          std::string str(bytes.begin(), bytes.end());
          id(rawString).publish_state(str.c_str()); 
          float sensors_values0 =0;
          float sensors_values1 =0;
          float sensors_values2 =0;
          if (sscanf(str.c_str(), "%f;%f;%f", &sensors_values0, &sensors_values1, &sensors_values2) == 3 ) {
              id(tempA1).publish_state(sensors_values0);            
              id(tempA2).publish_state(sensors_values1);
              id(tempA3).publish_state(sensors_values2);
          }         

sensor:
  - platform: template
    name: "A1"
    id: "tempA1"
  - platform: template
    name: "A2"
    id: "tempA2"
  - platform: template
    name: "A3"
    id: "tempA3"

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thanks

23

The sscanf format string %f is for base10 numeric floating point values. The first value in your input “AA” can’t be converted. If it is a hexadecimal value then you can use %x.

24

thank you , it works fine .

does it change a lot if first value in input is “SR”

second problem : how in lambda check if first input is “AA” or “SR”

25

%s will read in a string. If you only have the two options “AA” or “SR” you could do two sscanf() statements with “AA;%f;%f” and “SR;%f;%f”

26

I’m trying to send and receive data from an ESP32 to an Arduino Mega via UART.

Sending goes from the ESP to the Mega in the direction of Mega.

I can see that in the Mega log and in the ESP log.

When data is sent from the Mega, I can still see it in the serial monitor in the Mega but nothing arrives in the ESP, at least that’s what it looks like.

Can someone please help me?

her is the Arduino-Mega Serial-Output.
first lines is from ESP-restart.

12:34:08.518 -> Empfangen vom ESP : [878781][D][Updater.cpp:133] begin(): OTA Partition: app0

12:34:20.850 -> Empfangen vom ESP : [891108][V][WiFiGeneric.cpp:360] _arduino_event_cb(): STA Disconnected: SSID: ASUS, BSSID: 40:b0:76:9a:4d:70, Reason: 8

12:34:20.881 -> Empfangen vom ESP : [891108][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino EvenCONNECTED

12:34:20.881 -> Empfangen vom ESP : [891115][W][WiFiGeneric.cpp:950] _eventCallback(): Reason: 8 - 3][V][WiFiGeneric.cpp:341] _arduino_event_cb(): STA Stopped

12:34:21.213 -> Empfangen vom ESP : [891128][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Even[   753][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 0 - WIFI_READY

12:34:21.213 -> Empfangen vom ESP : [   786][V][WiFiGeneric.cpp:338] _arduino_event_cb(): STA Started

12:34:21.248 -> Empfangen vom ESP : [   787][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 2 - STA_START

12:34:27.149 -> Empfangen vom ESP : [  6710][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 128, Status: 0, Results: 9

12:34:27.149 -> Empfangen vom ESP : [  6710][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE

12:34:28.017 -> Empfangen vom ESP : [  7558][V][WiFiGeneric.cpp:353] _arduino_event_cb(): STA Connected: SSID: ASUS, BSSID: 40:b0:76:9a:4d:70, Channel: 10, Auth: WPA2_PSK

12:34:28.017 -> Empfangen vom ESP : [  7559][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Even][V][WiFiGeneric.cpp:367] _arduino_event_cb(): STA Got New IP:192.168.2.119

12:34:28.061 -> Empfangen vom ESP : [  7574][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino EvenFiGeneric.cpp:991] _eventCallback(): STA IP: 192.168.2.119, MASK: 255.255.255.0, GW: 192.168.2.1

12:36:47.411 -> Empfangen vom ESP : 
12:38:17.789 -> Empfangen vom ESP : DataToSend from button esp
12:38:44.242 -> Nachricht Serial.print von Mega To Esp: dd

The last lines 12:38:17.789 , was i pressed the button on the ESP
The last line shows a manual input from me on the Arduino Mega’s serial monitor

The Logfile from ESP32 (ESP32-S2-DevKit-M-1)

[12:34:30][I][app:100]: ESPHome version 2024.10.3 compiled on Nov 19 2024, 12:32:50
[12:34:30][C][wifi:600]: WiFi:
[12:34:30][C][wifi:428]:   Local MAC: 70:04:1D:FB:D9:DA
[12:34:30][C][wifi:433]:   SSID: [redacted]
[12:34:30][C][wifi:436]:   IP Address: 192.168.2.119
[12:34:30][C][wifi:440]:   BSSID: [redacted]
[12:34:30][C][wifi:441]:   Hostname: 'watercontroltest'
[12:34:30][C][wifi:443]:   Signal strength: -46 dB ▂▄▆█
[12:34:30][V][wifi:445]:   Priority: 0.0
[12:34:30][C][wifi:447]:   Channel: 10
[12:34:30][C][wifi:448]:   Subnet: 255.255.255.0
[12:34:30][C][wifi:449]:   Gateway: 192.168.2.1
[12:34:30][C][wifi:450]:   DNS1: 192.168.2.1
[12:34:30][C][wifi:451]:   DNS2: 0.0.0.0
[12:34:30][C][logger:185]: Logger:
[12:34:30][C][logger:186]:   Level: VERBOSE
[12:34:30][C][logger:188]:   Log Baud Rate: 115200
[12:34:30][C][logger:189]:   Hardware UART: USB_CDC
[12:34:30][C][uart.arduino_esp32:151]: UART Bus 0:
[12:34:30][C][uart.arduino_esp32:152]:   TX Pin: GPIO44
[12:34:30][C][uart.arduino_esp32:153]:   RX Pin: GPIO45
[12:34:30][C][uart.arduino_esp32:155]:   RX Buffer Size: 256
[12:34:30][C][uart.arduino_esp32:157]:   Baud Rate: 115200 baud
[12:34:30][C][uart.arduino_esp32:158]:   Data Bits: 8
[12:34:30][C][uart.arduino_esp32:159]:   Parity: NONE
[12:34:30][C][uart.arduino_esp32:160]:   Stop bits: 1
[12:34:30][C][uart.button:014]: UART Button 'UART String Output'
[12:34:30][C][captive_portal:089]: Captive Portal:
[12:34:30][C][web_server:153]: Web Server:
[12:34:30][C][web_server:154]:   Address: 192.168.2.119:80
[12:34:30][C][mdns:116]: mDNS:
[12:34:30][C][mdns:117]:   Hostname: watercontroltest
[12:34:30][V][mdns:118]:   Services:
[12:34:30][V][mdns:120]:   - _esphomelib, _tcp, 6053
[12:34:30][V][mdns:122]:     TXT: friendly_name = WaterControler_test
[12:34:30][V][mdns:122]:     TXT: version = 2024.10.3
[12:34:30][V][mdns:122]:     TXT: mac = 70041dfbd9da
[12:34:30][V][mdns:122]:     TXT: platform = ESP32
[12:34:30][V][mdns:122]:     TXT: board = esp32-s2-saola-1
[12:34:30][V][mdns:122]:     TXT: network = wifi
[12:34:30][V][mdns:122]:     TXT: api_encryption = Noise_NNpsk0_25519_ChaChaPoly_SHA256
[12:34:30][V][mdns:120]:   - _http, _tcp, 80
[12:34:30][C][esphome.ota:073]: Over-The-Air updates:
[12:34:30][C][esphome.ota:074]:   Address: 192.168.2.119:3232
[12:34:30][C][esphome.ota:075]:   Version: 2
[12:34:30][C][esphome.ota:078]:   Password configured
[12:34:30][C][safe_mode:018]: Safe Mode:
[12:34:30][C][safe_mode:020]:   Boot considered successful after 60 seconds
[12:34:30][C][safe_mode:021]:   Invoke after 10 boot attempts
[12:34:30][C][safe_mode:023]:   Remain in safe mode for 300 seconds
[12:34:30][C][api:140]: API Server:
[12:34:30][C][api:141]:   Address: 192.168.2.119:6053

The ESPhome-Code


uart:
  tx_pin: GPIO44
  rx_pin: GPIO45
  id: uart_bus
  baud_rate: 115200
  debug:
    direction: BOTH
    dummy_receiver: true
    #after:
    #  delimiter: "\n"
    sequence:
      - lambda: UARTDebug::log_string(direction, bytes);

button:
  - platform: uart
    name: "UART String Output"
    data: 'DataToSend from button esp'
#custom_component:
#- lambda: |-
#    auto my_custom = new MyCustomComponent(id(uart_bus));
#    return {my_custom};

captive_portal:

sorry all, now works fine… i used the wrong RX/TX Pins…