IoT (LTE) temperature and humidity sensor
Custom design temperature and humidity logger that collects temperature, humidity and location data and sends it to the cloud
Solution
Hardware
STM32L073 MCU
BG96 LTE module
Combo LTE/GPS antenna
sht30 humidity and temp sensor
3xAA batteries
SOFTWARE
C Programming
ENCLOSURE
IP54 rating
Custom shape plastic enclosure
TEAM
1 x Embedded Engineer
1 x Embedded Programmer
1 x Enclosure designer
Problem
Our client needed a custom solution for hardware and firmware of a device that would log temperature, humidity and location data and send it to the cloud.
Hardware requirements:
- LTE
- GPS
- USB for firmware updates
- Battery-powered (3xAA)
- Temperature measurements (±0.1°C)
- Humidity measurements (±1.5%RH)
Software requirements
- Sending the data to the Cloud
- Temperature, humidity, and location data logging
- Changing the frequency of data transfer to the cloud
General requirements
- The specific shape of the enclosure
- IP54 rating
- Minimum 6 months of battery life (for data transfer frequency of 1 time a day)
- Functional prototype ready for the process of certification
Solution
Through the development process of this device, we did our best to reduce the power consumption as the device required long running times on a single battery charge. We carefully picked all of the components to ensure that every mAh of energy is saved.
The device had a specific shape which we had to incorporate with the IP54 rating. This means that the device had to be waterproof while keeping the shape of the device and low manufacturing costs.
Result
The final device was able to last up to a 1 year with data transfers of once a day. W tested the device thoroughly and it was ready for the certification process.
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