Data from Arduino to ESP32 to Raspberry Pi

Third party integrations
1

Hi guys,
i build a watering system for some of my plants and i want to monitor the sensor data in Home assistant.

I am able so send some data from the Arduino via the TX/RX pins to the ESP32, but now i dont know how to get the Data to Home Assistant and plot it. I plan to send the data from 4 moisture sensors.

The parts i have: Raspberry Pi 4, Arduino and ESP32 D1 Mini NodeMCU

2
3

Isn’t the ESP32 with esphome software enough? The ESP has GPIO, too.

4

@m0wlheld As i see it, you have an analog input, but digital only binary. Maybe i am missing something here.

5

Some GPIO are multi-purpose and with using the Analog Digital Converter sensor of esphome, you can use them to report analog values.

On the ESP32 pins GPIO32 through GPIO39 can be used.

6

I know that it has an ADC, but i want to send digital data from my arduino to the esp and then to the Home Assistant

7

Understood. My proposal was to connect the moisture sensors to the ESP32 directly and configure them as ADC inputs in ESPHome. ESPHome has a native integration in Home Assistant (which will actully pop-up as soon as your ESPHome-flashed devices starts).

8

Use esphome on the esp32. Use the UART text component I pointed to earlier.

9

@m0wlheld: I dont want to connect the moisture sensor directly to the esp32. I use the sensor as input data for the Arduino system. Besides that, i prefere digital data so i have less disturbance.

@nickrout: I am a beginner and would need some guidance.
In the UART example it is written
"Store this file in your configuration directory, for example “uart_read_line_sensor.h”
How do i do that? Is that something i have to do on the microSD card of the raspberry PI4?

Or do i have to do it in the Home Assistance interface in my browser? If it is here, where exactly? I have a “Configuration” in my menu and there is a “Skript” option, but i don’t think thats the right one.

10

So nobody can help me?

11

The directory where you store the esphome yaml file.

12

So i created a new Node which is called “WaterSensor.yaml”.
This file was saved in the folder: “/config/esphome”.
Then i created the file “uart_read_line_sensor.h” in the same folder.
After that, i added the rest from: https://esphome.io/components/text_sensor/uart.html to the “WaterSensor.yaml” file. It now looks like:

esphome:
  name: WaterSensor
  platform: ESP32
  board: nodemcu-32s
  includes:
    - uart_read_line_sensor.h

wifi:
  ssid: "xxx"
  password: "xxx"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Watersensor Fallback Hotspot"
    password: "xxx"

captive_portal:

# Enable logging
logger:
    level: VERBOSE #makes uart stream available in esphome logstream
    baud_rate: 0
  
# Enable Home Assistant API
api:
  password: "xxx"

ota:
  password: "xxx"

uart:
    id: uart_bus
    tx_pin: D0
    rx_pin: D1
    baud_rate: 9600

text_sensor:
- platform: custom
  lambda: |-
    auto my_custom_sensor = new UartReadLineSensor(id(uart_bus));
    App.register_component(my_custom_sensor);
    return {my_custom_sensor};
  text_sensors:
    id: "uart_readline"

switch:
  - platform: template
    name: "Switch"
    lambda: |-
      if (id(uart_readline).state == "*POW=ON#") {
        return true;
      } else if(id(uart_readline).state == "*POW=OFF#") {
        return false;
      } else {
        return {};
      }
    turn_on_action:
      - uart.write: "\r*pow=on#\r"
    turn_off_action:
      - uart.write: "\r*pow=off#\r"

interval:
  - interval: 10s
    then:
      - uart.write: "\r*pow=?#\r"

Was that right?

13

When i try to compile it, i get the message:

INFO Reading configuration /config/esphome/watersensor.yaml...
Failed config

uart: 
  - [source /config/esphome/watersensor.yaml:32]
    id: uart_bus
    
    Cannot resolve pin name 'D0' for board nodemcu-32s.
    tx_pin: D0 [source /config/esphome/watersensor.yaml:33]
    
    Cannot resolve pin name 'D1' for board nodemcu-32s.
    rx_pin: D1 [source /config/esphome/watersensor.yaml:34]
    baud_rate: 9600