ESP32 - DYP A02 Ultrasonic configuration

[Threephase]

Hi guys!

I’m super new to home assistant,yaml, esphome etc.

I’m having a real hard time with configuring an ultrasonic sensor. I have scoured the net for example code and tutorials.

I have an esp32 dev ch340 and DYP A02 ultrasonic sensor.

The DYP A02’s pinout is as follows:
PIN 1 - VCC
PIN 2 - GND
PIN3 - RX
PIN4 - TX

I have checked my esp32 pinout diagram and have connected the above sensor as follows:

ESP 32 PIN VIN - to sensor PIN 1 (VCC supplying 5v)
ESP 32 PIN GND - to sensor PIN 2 (supplying GND)
ESP 32 PIN D16 - GPIO16 RX - to sensor PIN 3 (RX)
ESP 32 PIN D17 - GPIO17 TX - to sensor PIN 3 (TX)

My code:

esphome:
  name: esphome-web-09eba8
  friendly_name: Float switch

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

ota:


wifi:
  ssid: "xxxxxxxxxxxxxxxxxxxx"
  password: "xxxxxxxxxxxxxxxxxxxxxx"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "xxxxxxxxxxxxxxxxxxx"
    password: "xxxxxxxxxxxxxxxxxxx"

captive_portal:

sensor:
  - platform: ultrasonic
    trigger_pin: GPIO16
    echo_pin: GPIO17
    name: "Ultrasonic Sensor"
    update_interval: 5s
    pulse_time: 10us
    timeout: 20m

I am getting this error:

[12:44:35][C][logger:301]: Logger:
[12:44:35][C][logger:302]:   Level: DEBUG
[12:44:35][C][logger:303]:   Log Baud Rate: 115200
[12:44:35][C][logger:305]:   Hardware UART: UART0
[12:44:35][C][ultrasonic.sensor:045]: Ultrasonic Sensor 'Ultrasonic Sensor'
[12:44:35][C][ultrasonic.sensor:045]:   State Class: 'measurement'
[12:44:35][C][ultrasonic.sensor:045]:   Unit of Measurement: 'm'
[12:44:35][C][ultrasonic.sensor:045]:   Accuracy Decimals: 2
[12:44:35][C][ultrasonic.sensor:045]:   Icon: 'mdi:arrow-expand-vertical'
[12:44:35][C][ultrasonic.sensor:046]:   Echo Pin: GPIO17
[12:44:38][D][ultrasonic.sensor:040]: 'Ultrasonic Sensor' - Got distance: 0.16 m
[12:44:38][D][sensor:094]: 'Ultrasonic Sensor': Sending state 0.16035 m with 2 decimals of accuracy
[12:44:38][W][component:204]: Component ultrasonic.sensor took a long time for an operation (0.09 s).
[12:44:38][W][component:205]: Components should block for at most 20-30ms.
[12:44:43][D][ultrasonic.sensor:040]: 'Ultrasonic Sensor' - Got distance: 0.16 m
[12:44:43][D][sensor:094]: 'Ultrasonic Sensor': Sending state 0.16070 m with 2 decimals of accuracy
[12:44:43][W][component:204]: Component ultrasonic.sensor took a long time for an operation (0.05 s).
[12:44:43][W][component:205]: Components should block for at most 20-30ms.
[12:44:48][D][ultrasonic.sensor:040]: 'Ultrasonic Sensor' - Got distance: 0.16 m
[12:44:48][D][sensor:094]: 'Ultrasonic Sensor': Sending state 0.16052 m with 2 decimals of accuracy
[12:44:53][D][ultrasonic.sensor:040]: 'Ultrasonic Sensor' - Got distance: 0.16 m
[12:44:53][D][sensor:094]: 'Ultrasonic Sensor': Sending state 0.16052 m with 2 decimals of accuracy
[12:44:53][W][component:204]: Component ultrasonic.sensor took a long time for an operation (0.08 s).
[12:44:53][W][component:205]: Components should block for at most 20-30ms.

I get a constant reading of 0.16m and timeout error’s.

Any one have some advise?

[jaaem]

It is usually TX->RX and RX->TX . It does seem from tasmota forums that it works the same as the standard HC-SR04

[orange-assistant (the real one)]

@Threephase

DYP A02 ultrasonic sensor.

3cm blind zone IP67 high precision ultrasonic sensor (DYP-A02)

·Multiple output interfaces optional: UART automatic ,UART ·controlled, PWM pulse width, Switch , RS485

The component you used expects a trigger and echo pin. Probaby the PWM pulse version is what you would need for it I guess.

ESPHome also supports a ultrasonic sensor that works over I2C - if yours working only with UART you mind need to patch things together yourself

@jaaem

It is usually TX->RX and RX->TX

He doesn’t have UART configured and does not use the pins for that function hence it doesn’t matter at all

PS.: @Threephase your post would fit better in the esphome category

ESPHome

[Threephase]

Hey man thanks so much for responding. I’m not sure how I missed the ESPhome section, how do I go about moving this thread?

Regarding your reply, I am still battling to understand the issue due to my lack of knowledge.
I came across a little bit of code for UART which was setup like this:

uart:
  id: mod_bus
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 9600
  stop_bits: 1  

does the above code look correct to start setting up UART?

I thought I would be able to find code online I could copy/paste as that is how I have managed to build all my basic home assistant entities. Don’t get me wrong I have learnt some basics but this setup is a lot more advanced than I thought it would be. I don’t know enough to even start to problem solve this.

Not sure what to do, so I was hoping that some one could assist with some code or advice to get this thing working. If I do get it working I am definitely going to post a tutorial online for the next user as this is such an awesome project to get working and should be freely available to anyone!

[orange-assistant (the real one)]

@Threephase

how do I go about moving this thread?

You can just edit the first post and change to category

@Threephase

does the above code look correct to start setting up UART?

That looks OKisk to setup up the UART bus on the esp side.

@Threephase

Not sure what to do

I think your device (when it only works over UART) is just not supported in esphome at the moment.

Some times ultrasonic sensor actually have a way to change the output interface - maybe you are lucky and can force your device the work the simple way via trigger and echo pin.

Well, not lucky regarding that info

A02-Output-Interfaces.pdf

Do you have any idea which version you got?

No.	Main Spec.	Output interface	Model No.
1	Split waterproof probe, no shell	UART auto	DYP-A02YYU-V2.0
2	Split waterproof probe, no shell	UART controlled	DYP-A02YYT-V2.0
3	Split waterproof probe, no shell	PWM pulse width,	DYP-A02YYM-V2.0
4	Split waterproof probe, no shell	Switch	DYP-A02YYGD-V2.0
5	Split waterproof probe and housing	UART auto	DYP-A02YYUW-V2.0
6	Split waterproof probe and housing	UART controlled	DYP-A02YYTW-V2.0
7	Split waterproof probe and housing	PWM pulse width,	DYP-A02YYMW-V2.0
8	Split waterproof probe and housing	Switch	DYP-A02YYGDW-V2.0
9	Split waterproof probe and housing	RS485	DYP-A02YY4W-V2.0

[Threephase]

Unfortunately my sensor came with no documentation. The local site that I purchased it from can only tell me that it is an A02 but cannot stipulate which model. There is a sticker on the sensor with the following:

A0221AU
2134013

I just want to already thank you for taking the time out to help me.

Edit: it seems to bring up alot of UART controlled sensors when googling

[Threephase]

This is the closest thread to my issue and the user ended up getting the PWM version as he could not get the UART version to work. Seems I may have wasted a purchase.

Ultrasonic UART sensor

I cannot get my ultrasonic sensor to work, and I cannot seem to understand what I am doing wrong. This is my code: esphome: name: waste_tank platform: ESP32 board: nodemcu-32s wifi: ssid: "xxx" password: "xxx" # Enable logging logger: sensor: - platform: ultrasonic trigger_pin: GPIO5 echo_pin: GPIO4 unit_of_measurement: "%" icon: "mdi:water-percent" accuracy_decimals: 0 update_interval: 5000ms name: "Waste tank" My log looks like this: [18:22:05][C…

[orange-assistant (the real one)]

@Threephase

A0221AU

esphome just got support for a A01NYUB ultrasonic sensor which communicates over UART

A01NYUB Waterproof Ultrasonic Sensor

Might be worth a shot for with your device

[Heatvent]

@Threephase

A0221AU

The A01NYUB isn’t the greatest for a sump since it has an 11" blind spot.

Has anyone been able to get the a02yyuw workign with Home Assistant ESPHome? I have been futzing with this for a while and can’t get it to work. Mine is no a DFRobot but some other UART version from Amazon that at least appears identical. But I can’t get it to work. Also tried with an arduino uno and DFRobot sample code with no luck. So maybe it’s just not compatible in some way.

[wh5220]

For anybody who may come across this forum and needs something to work for them, This is what worked for me to get my Controlled UART Sensor to show distance:
The sample code near the bottom of this page Underwater Ultrasonic Obstacle Avoidance Sensor -6m Arduino WiKi - DFRobot
Worked for my A2211AT Ultrasonic sensor (Not the sensor this code is designed for but i’ll take the win).
I am using an ESP32-WROOM-32U

[gimisa]

Hi I have a ultrasonic sensor model A02YYT brought from amazon . Its running on ESP32 and program with esphome devkitc V4 with the following code hope it helps :
esp32: board is ESP32 DevKitC ESP32-WROOM-32U Core Development Board with 3dBi 2.4GHz Antenna, Micro USB, WiFi+BT Development Module, Dual-Core Processing for IoT Projects (DevKitC) : Amazon.ca: Electronics

A022YT sensor: Amazon.ca

#/*********
#https://docs.espressif.com/projects/esp-idf/en/v5.1/esp32/hw-reference/esp32/get-started-devkitc.html#get-started-esp32-devkitc-board-front
#*********/

esphome:
  name: ultrasound
  platform: ESP32
  board: esp32dev
  platformio_options: 
    platform: espressif32
    board: az-delivery-devkit-v4
    board_build.mcu: esp32
    board_build.f_cpu: 240000000L

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: ""

ota:
  - platform: esphome
    password: ""

wifi:
  ssid: "yourwifi"
  password: "yourpassword"
  # since I have a hidden network :
  fast_connect: "true"
  manual_ip:
    static_ip: 192.168.2.222
    gateway: 192.168.2.1
    subnet: 255.255.255.0


  ap:
    ssid: "ultrason"
    password: "password"
    
captive_portal:

uart:
    rx_pin: 19 # ESP32 C3 super mini
    #tx_pin: 18 # ESP32 C3 super mini used by switch to trigger 
    baud_rate: 9600

sensor:

• platform: a02yyuw
  id: a02yyuw_sensor # UART Controlled
  name: “detected_Distance(m)”
  unit_of_measurement: ‘m’
  accuracy_decimals: 2

    filters:
      - multiply: 0.00125
      - calibrate_linear:
         method: least_squares
         datapoints:
         # Map 0.x (from sensor) to 1.0 (true value)
          - 0.53 -> 0.52
          - 1.01 -> 0.93
          - 1.54 -> 1.34
          - 2.32 -> 1.98
#
#      - throttle: 5s
#      - heartbeat: 5s
#      - quantile:
#         window_size: 7
#         send_every: 4
#         send_first_at: 3
#         quantile: .9
#      - debounce: 0.1s

switch:

• platform: gpio
  name: “GPIO21 Switch”
  pin: 18
  id: GPIO21_switch
  internal: true

interval:

• interval: 3s
  then:
  • switch.turn_on: GPIO21_switch
  • delay: 100ms
  • switch.turn_off: GPIO21_switch
  • delay: 50ms