I’ve got a jsn-sr04t (silkscreen says aj-sr04m, amazon says jsn…). I’m attempting to get it reading to ESPHome. I’m not having much success. I’ve UART debugging on, and I can see messages being exchanged but the sensor in the webui does not read a distance. The jsn-sr04t is configured for mode 2. The board is a Firebeetle 2 ESP32C6.
Here are the (hopefully) relevant config sections. I’ve tried with and without the uart.id in there.
logger:
baud_rate: 0
# level: DEBUG
web_server:
port: 80
version: 3
local: True
uart:
tx_pin: 16
rx_pin: 17
baud_rate: 9600
id: "UART1"
debug:
direction: BOTH
dummy_receiver: false
after:
delimiter: "\n"
sequence:
- lambda: UARTDebug::log_string(direction, bytes);
sensor:
- platform: "jsn_sr04t"
name: "Distance"
update_interval: 1s
model: "aj_sr04m"
uart_id: "UART1"
# on_value_range:
# - below: 250
# then:
# - switch.turn_on: led_yellow
# - above: 300
# then:
# - switch.turn_off: led_yellow
As I said, I can see serial going on:
Any guidance on where I’m going wrong here would be appreciated. Thanks!
The whole config (in case it makes any difference:
sump-alarm.yaml
esphome:
name: "sump-alarm"
friendly_name: Sump Alarm
min_version: 2025.5.1
name_add_mac_suffix: false
esp32:
board: esp32-c6-devkitc-1
variant: esp32c6
framework:
type: esp-idf
# Enable logging
logger:
baud_rate: 0
level: DEBUG
# Enable Home Assistant API
api:
# Allow Over-The-Air updates
ota:
- platform: esphome
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
fast_connect: yes
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Sump-Alarm"
password: !secret wifi_fallback_password
web_server:
port: 80
version: 3
local: True
binary_sensor:
- platform: gpio
device_class: moisture
pin:
number: 7 # D11
mode:
input: True
pullup: True
inverted: False
name: "Float"
id: "float_switch"
filters:
- delayed_on_off: 10ms
on_state:
then:
- if:
condition:
- binary_sensor.is_on: float_switch
then:
- switch.turn_on: led_red
- switch.turn_on: alarm_buzzer
else:
- switch.turn_off: led_red
- switch.turn_off: alarm_buzzer
switch:
- platform: gpio
pin: 8 # D2
name: "Buzzer"
id: "alarm_buzzer"
internal: False
restore_mode: ALWAYS_OFF
on_turn_on:
then:
- script.execute: status_green
on_turn_off:
then:
- script.execute: status_green
- platform: gpio
pin: 14 # D3
name: "Red"
id: "led_red"
internal: False
restore_mode: ALWAYS_OFF
on_turn_on:
then:
- script.execute: status_green
on_turn_off:
then:
- script.execute: status_green
- platform: gpio
pin: 1 # D6
name: "Yellow"
id: "led_yellow"
internal: False
restore_mode: ALWAYS_OFF
on_turn_on:
then:
- script.execute: status_green
on_turn_off:
then:
- script.execute: status_green
- platform: gpio
pin: 18 # D7
name: "Green"
id: "led_green"
internal: False
restore_mode: ALWAYS_ON
script:
- id: status_green
then:
- if:
condition:
- switch.is_off: led_yellow
- binary_sensor.is_off: float_switch
then:
- switch.turn_on: led_green
else:
- switch.turn_off: led_green
status_led:
pin: 15
uart:
tx_pin: 16
rx_pin: 17
baud_rate: 9600
id: "UART1"
debug:
direction: BOTH
dummy_receiver: false
after:
delimiter: "\n"
sequence:
- lambda: UARTDebug::log_string(direction, bytes);
sensor:
- platform: "jsn_sr04t"
name: "Distance"
update_interval: 1s
model: "aj_sr04m"
uart_id: "UART1"
# on_value_range:
# - below: 250
# then:
# - switch.turn_on: led_yellow
# - above: 300
# then:
# - switch.turn_off: led_yellow
- platform: wifi_signal
name: 'WiFi Signal'
entity_category: diagnostic
- platform: uptime
name: 'Uptime'
entity_category: diagnostic
unit_of_measurement: s
text_sensor:
- platform: version
name: 'ESPHome Version'
entity_category: diagnostic
- platform: wifi_info
ip_address:
name: WiFi IP Address
entity_category: diagnostic
id: ip_address
ssid:
name: WiFi SSID
entity_category: diagnostic
id: ssid
mac_address:
name: WiFi MAC Address
entity_category: diagnostic
id: wifi_mac
dns_address:
name: WiFi DNS Address
entity_category: diagnostic
id: wifi_dns
button:
- platform: restart
name: "Sump Alarm Restart"
id: "restart_button"
i2c:
sda: 19
scl: 20
display:
- platform: ssd1306_i2c
model: "SSD1306 128x64"
address: 0x3C
lambda: |-
it.print(0, 0, id(my_font), "IP: ${ip_address}");
font:
- file: "fonts/BlockMono-Bold.ttf"
id: my_font
size: 12
bpp: 2
