Project Name: Asset GPS Tracking with Integrated Level Sensor V3
Objective: To design and manufacture a low-power asset tracking device with an integrated level sensor, utilizing the nRF9161 chipset for NB-IoT, LTE-M, and GPS connectivity. The device will be powered by a 3.6V Li-SOCl2 battery and must operate with ultra-low power consumption to ensure long battery life.

1. Hardware Requirements
1.1 Processor
Nordic Semiconductor nRF9161
Supports NB-IoT and LTE-M for network connectivity
Integrated GPS for location tracking
1.2 Power Supply
Powered by a 3.6V Li-SOCl2 battery
Ultra-low power consumption: <50µA in sleep mode
1.3 Level Sensor Interface
Provides a 3.3V output pin to power the level sensor
Supports both analog and TTL level sensors
Level sensor connection via cable
Level Sensor Specifications:
Measurement range: 0 to 5000mm
1-mm resolution
Long, narrow detection zone
Operating voltage: 2.7V - 5.5V
Low 2.9mA average current requirement
Small, lightweight module
Operational temperature: -40°C to +65°C
1.4 Antennas
Integrated SMD antennas for LTE and GPS to save space and improve durability
1.5 Connectivity & Interfaces
USB-C port for programming and debugging
UART/SPI/I2C interfaces for additional expansion if required

2. Mechanical & Design Considerations
Compact PCB design with SMD components
Ruggedized enclosure for industrial use
IP-rated enclosure for outdoor deployment (optional)
Secure and reliable cable connection for the level sensor

3. Power Management
Deep sleep mode with ultra-low power consumption (<50µA)
Efficient power management for prolonged battery life
Optimized wake-up logic to reduce unnecessary power drain

4. Firmware & Software
Zephyr RTOS-based firmware for flexibility and power efficiency
MQTT/CoAP support for data transmission
Configurable sensor reading and transmission intervals

5. Manufacturing Considerations
Low-cost, mass-production-friendly design
SMD-based compact PCB for efficient manufacturing
Cost-effective components without compromising reliability
6. Summary & Next Steps
This document outlines the core requirements and specifications for a GPS asset tracker with an integrated level sensor. We are looking for a manufacturing partner in China who can provide cost-effective solutions while maintaining quality and efficiency.
Interested manufacturers, please provide:
Estimated production cost for 100 - 1000 units
Lead time for prototyping and mass production
Recommendations for further optimizations to reduce cost and improve performance
For further discussions, please contact us.