ChatDiagram
ELECTRONICS

Automatic Water Level Controller

A worked electronics example, rendered live. Open it in the AI editor and adapt it to your own case.

UPDATED 2026-07-31
TYPECircuit
USE-CASEWater Level Controller
EXAMPLEAutomatic Water Level Controller
Make this diagram your own.

Open it in the AI editor with a prompt pre-filled — keep what works, change what doesn't.

CASE ANALYSIS

Scenario

Designing a simple water level controller using an NPN transistor as a switch to drive a pump motor, with a high-level probe to detect water level.

Key decisions

  • Using an NPN transistor (Q1) as a switch instead of a relay for simplicity and low cost.
  • A pull-up resistor (R1) keeps the transistor on when water drops below the high probe.
  • A second resistor (R2) limits current when the probe is submerged, protecting the transistor base.
  • A flyback diode (D1) protects against voltage spikes from the pump motor.
  • Two probe terminals: common grounded probe and high-level sense probe.

When to reuse this

Suitable for automatic water tank filling in residential or agricultural settings where a low-cost, reliable electronic control is needed without complex logic.

← See more water level controller examples
Open this example in the editor →

Tweak it with chat, export PNG/SVG, or fork it for your own use case.