JSN-SR04T Waterproof Ultrasonic Range Finder

This sensor allows you to use the JSN-SR04T and AJ_SR04M Waterproof Ultrasonic Range Finder in Mode 1 and 2 with ESPHome to measure distances. This sensor can measure ranges between 25 centimeters and 600 centimeters with a resolution of 1 millimeter.

Configure the JSN-SR04T for mode 1:

  • V1.0 and V2.0: Add a 47k resistor to pad R27.

  • V3.0: Short pad M1 or add 47k resistor to pad mode.

Configure the JSN-SR04T for mode 2:

  • V1.0 and V2.0: Add a 120k resistor to pad R27.

  • V3.0: Short pad M2 or add 120k resistor to pad mode.

Configure the AJ_SR04M for mode 1:

  • Add a 120k resistor to pad R19.

Configure the AJ_SR04M for mode 2:

  • Add a 47k resistor to pad R19.

../../_images/jsn-sr04t-v3-mode-select-pads.jpg

JSN-SR04T Waterproof Ultrasonic Range Finder Mode Select Pads.

In mode 1 the module continuously takes measurements approximately every 100mS and outputs the distance on the TX pin at 9600 baud. In this mode Sensor Filters are highly recommended.

In mode 2 the module takes a measurement only when a trigger command of 0x55 is sent to the RX pin on the module. The module then outputs the distance on its TX pin. The frequency of the measurements can be set with the update_interval option.

To use the sensor, first set up an UART Bus with a baud rate of 9600 and connect the sensor to the specified pin.

../../_images/jsn-sr04t-v3.jpg

JSN-SR04T Waterproof Ultrasonic Range Finder.

# Example configuration entry
sensor:
  - platform: "jsn_sr04t"
    name: "Distance"
    update_interval: 1s

Configuration variables:

  • update_interval (Optional, Time): The interval to check the sensor. Defaults to 60s. Not applicable in mode 1.

  • uart_id (Optional, ID): The ID of the UART bus you wish to use for this sensor. Use this if you want to use multiple UART buses at once.

  • model (Optional): Sensor model. Available options: jsn_sr04t (default) and aj_sr04m.

  • All other options from Sensor.

See Also