What you’ll need
- • 2.4 GHz Wi-Fi network (SSID + password)
- • Power: 12V adapter or solar (with appropriate regulator)
- • eco1/eco2: Included JSN ultrasonic sensor + transducer
- • Plus: RS-485 bus sensors (select supported type)
- • Phone, tablet, or laptop with Wi-Fi + web browser
System connection diagram
This is a high-level overview. Use the interactive map below for variant-specific wiring and parts.
Interactive wiring map
Switch between eco1, eco2, and Pebble Plus. Plus supports alternate RS-485 sensors.
Pebble eco1
1 SensorController + Wi-Fi setup
JSN ultrasonic (included)
Tank topBoard + transducer for 1 tank opening
Optional routing
Coax → BNC → extension
Note: Avoid measuring within ~28 cm below the sensor (blind zone).
Pebble eco2
2 Sensors
Main + Reserve sensor (reserve is exclusive to the main)
JSN ultrasonic x2 (included)
Main + Reserve
Two tank openings: main + dedicated reserve
Tip: Label cables “Main” and “Reserve” during install.
Plus is the only unit with RS-485 bus sensor options. eco1/eco2 always use the included JSN transducer.
Pebble Plus
RS-485
Single trunk cable daisy-chains up to 6 sensors (3 main + 3 reserve)
RS-485 Sensors (Plus only)
Select sensor type used on the bus.
JSN-SR04T
Main or Reserve channel
IP68 Junction
Straight / Tee splice point
Cable:
Cat5e/Cat6 recommended. Twist A/B together. Twist +V/GND together. Daisy-chain only (no star).
1
Connect one sensor first
Start with ONE sensor connected to avoid confusion during addressing/assigning. After it is assigned and tested, add the next sensor one-at-a-time.
2
Power on & enter AP mode
On first boot the display shows “AP”. For a configured device, short-press the setup button to re-enter AP. Long-press (7+ seconds) resets network settings if required.
3
Connect to Pebble-Setup Wi-Fi
SSID: Pebble-Setup
Password: setup1234
Password: setup1234
Open a browser and visit http://192.168.4.1
4
Device configuration
- Login: Password is
setup1234 - Wi-Fi: Enter site SSID/password for cloud reporting
- Tanks: Name tanks and (optionally) set Tank IDs
- Updates: Choose keep-alive (1–4h) and delta threshold for instant pushes
5
Assign & test sensors
Open Sensor Configuration. With ONLY ONE sensor connected: press “Assign” for the target channel. Then press “Start Test” to view live readings. Repeat for each sensor by connecting one at a time.