Wireless IoT Sensor Network Solution

Application

Description

Complete wireless sensor network solution for IoT applications with sub-GHz transceivers, low-power microcontrollers, and sensor interfaces.

Core Advantages

Long-range sub-GHz communication

Ultra-low power consumption

Complete sensor interface

Flexible network architecture

Cost-optimized BOM

Recommended Bill of Materials (BOM)

Item	Part Number	Description	Quantity	Datasheet
1	AU7040	Sub-GHz wireless transceiver	1	📄 Download
2	AU6020	RTD-to-digital converter	1	📄 Download
3	CR2032	Coin cell battery	1	📄 Download
4	Pt1000	Temperature sensor	1	📄 Download
5	PCB Antenna	Integrated PCB antenna	1	📄 Download

Applications

Smart agriculture monitoring

Industrial sensor networks

Environmental monitoring

Smart building automation

Asset tracking systems

Technical Specifications

Wireless Range

2km+ line-of-sight

Frequency Band

433/868/915MHz

Battery Life

5+ years (CR2032)

Measurement Accuracy

±0.1°C (temperature)

Network Topology

Star or mesh

Max Nodes

1000+ in mesh

Customer Success Stories

Agricultural Technology Company

Smart Agriculture | Soil Monitoring Network

Challenge

Needed wireless soil temperature and moisture monitoring across large farm

Solution

Deployed 50 AU7040-based sensor nodes with AU6020 for soil temperature

Results

Industrial Equipment Manufacturer

Manufacturing | Equipment Health Monitoring

Challenge

Required wireless vibration and temperature monitoring on factory floor

Solution

Implemented AU7040 wireless nodes with various sensors

Results

FAE Expert Insights

Senior FAE

Applications Engineer

10+ years

Professional Insights

I've helped deploy many IoT sensor networks using the AU7040. The key to long battery life is aggressive power management: keep the radio in sleep mode as much as possible, use short transmission bursts, and optimize the duty cycle. For sensor measurements, the AU6020 provides excellent accuracy while consuming minimal power. Network architecture matters - star topology is simpler but mesh provides better coverage. For agricultural applications, consider environmental sealing as moisture is the enemy of electronics. Always do range testing in the actual deployment environment before finalizing the design.

Key Takeaways

Minimize radio on-time to extend battery life
Test range in actual deployment environment
Use mesh topology for better coverage
Implement environmental protection for outdoor use

Decision Framework

Steps:

Define sensor requirements and measurement frequency
Calculate power budget for target battery life
Determine wireless range and network topology
Design PCB with proper antenna matching
Test and optimize power consumption

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Frequently Asked Questions

What is the actual battery life?

Battery life depends on duty cycle: (1) 1 transmission/hour - 5+ years on CR2032

(2) 1 transmission/minute - 2-3 years

(3) Continuous RX - 1-2 weeks. Optimize by minimizing TX power, using short packets, and maximizing sleep time. The AU7040's 0.5μA sleep current is key to long battery life.

5+ years at 1 TX/hour; 2-3 years at 1 TX/minute.

Should I use star or mesh topology?

Topology selection depends on your application: (1) Star - simpler, lower latency, requires central gateway within range of all nodes

(2) Mesh - better coverage, self-healing, higher complexity and latency. For small deployments (<50 nodes) with good gateway placement, star is preferred. For large areas or many obstacles, mesh provides better coverage.

Use star for simple small networks; mesh for large area coverage.

How many nodes can I have?

Network capacity depends on topology and traffic: (1) Star - limited by channel capacity, typically 100-200 nodes

(2) Mesh - 1000+ nodes possible with proper routing. Limiting factors: channel bandwidth, collision avoidance, gateway processing capacity. For large networks, implement time-division or frequency-division multiplexing.

100-200 nodes in star; 1000+ in mesh with proper planning.

What frequency band should I use?

Frequency band selection depends on regional regulations and application requirements: (1) 433MHz - longest range, good penetration, most crowded in Europe

(2) 868MHz - good range, less crowded in Europe, regional restrictions apply

(3) 915MHz - good range, primarily for Americas, different regulations. Lower frequencies provide longer range and better penetration through obstacles. Consider: (1) Regional regulations - check local frequency allocations

(2) Range requirements - use 433MHz for maximum range

(3) Interference - check local spectrum usage

(4) Antenna size - lower frequencies require larger antennas. The AU7040 supports all three bands with software configuration.

Use 433MHz for max range; check regional regulations for 868/915MHz.

How do I optimize power consumption for battery life?

Power optimization strategies for IoT sensor nodes: (1) Minimize radio on-time - use short transmission bursts and low duty cycle

(2) Optimize TX power - use lowest power that maintains reliable communication

(3) Sleep mode - put MCU and radio in deep sleep between transmissions

(4) Sensor duty cycling - only power sensors during measurement

(5) Data aggregation - collect multiple readings before transmission

(6) Adaptive data rate - lower rate for better range, reducing retransmissions. The AU7040's 0.5μA sleep current and fast wake-up time enable aggressive power saving. With proper optimization, 5+ year battery life is achievable on a single CR2032 coin cell.

Minimize radio on-time, use sleep modes, and optimize TX power for best battery life.