Which design type is this question?

It is an ioT system question. You design a smart agriculture irrigation system and explain your choices the way you would in an interview.

Is this question asked at entry level?

It is marked Easy, so it suits engineers who are new to ioT system interviews. It is also a good warm-up before harder questions.

What should I cover first?

Start with the devices, what they send, how often and what must happen with it. Agree on scope with the interviewer before you design anything.

Can I practise it for free?

It is a premium question. Sign up and unlock it once for 10 credits; it then stays unlocked. When you finish, Lala, your personalized AI mentor, can review your design for 30 credits.

Design a smart agriculture irrigation system

PremiumIoT systemEasy

LoRaWAN
Duty cycle
Soil moisture sensors

Quick answer

This ioT system interview question asks you to design a smart agriculture irrigation system. Aim for a design that collects data from many devices and acts on it reliably, then explain device connections, ingestion, storage and trade-offs. Interviewers want to see how you handle unreliable networks, device scale and data volume.

The problem

Design a smart agriculture irrigation system: soil moisture sensors and valve controllers spread across farms report over LoRaWAN, and a cloud service decides when each field zone gets water. The hard parts are tiny radio budgets, sensors that must run five years on two AA cells, and valves that must never flood a field.

Each farm has 50 battery sensors buried in the fields, 5 solar-powered valve controllers and 3 LoRaWAN gateways with cellular backhaul. Farmers see moisture per zone in an app, set targets, and can open or close a valve by hand.

What must a smart agriculture irrigation system do?

Moisture data: Every sensor reports soil moisture and temperature every 15 minutes.
Automatic irrigation: Each zone is watered when moisture falls below its target, skipping days with rain forecast.

3 more requirementsUnlock to see all

How well must it do it?

Battery: Sensors last at least 5 years on two lithium AA cells (about 3,000 mAh).
Radio rules: Every device respects the 1% duty cycle of the EU868 sub-band it transmits on.

2 more requirementsUnlock to see all

What scale should you design for?

Use these numbers in your estimates.

The scale numbers unlock with this questionUnlock

Key concepts

LoRaWAN
Duty cycle
Soil moisture sensors
Battery budget
Class a and class c
Fail safe valves

How you’ll practise

6 short steps · save and come back any time

Requirements
Estimate
Device and connectivity
Ingestion and processing
Device management and updates
Wrap-up

Lala, personalized to you, gives a hint when you ask and reviews your design when you are ready.

What do interviewers look for?

In any IoT system design round.

Clarifies device count, message rate and payload size
Handles devices that go offline and reconnect
Plans ingestion that absorbs bursts
Separates hot real-time data from long-term storage
Covers device identity, updates and security
Explains what runs on the device and what runs in the cloud

Questions people ask about this interview question

Which design type is this question?: It is an ioT system question. You design a smart agriculture irrigation system and explain your choices the way you would in an interview.
Is this question asked at entry level?: It is marked Easy, so it suits engineers who are new to ioT system interviews. It is also a good warm-up before harder questions.
What should I cover first?: Start with the devices, what they send, how often and what must happen with it. Agree on scope with the interviewer before you design anything.
Can I practise it for free?: It is a premium question. Sign up and unlock it once for 10 credits; it then stays unlocked. When you finish, Lala, your personalized AI mentor, can review your design for 30 credits.

The problem

What must a smart agriculture irrigation system do?

How well must it do it?

What scale should you design for?

Key concepts

How you’ll practise

What do interviewers look for?

Questions people ask about this interview question

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