Freelancer logo How It Works Browse Jobs Log In Sign Up Post a Project Profile cover photoundefined
You're now following .
Error following user.
This user does not allow users to follow them.
You are already following this user.
Your membership plan only allows 0 follows. Upgrade here.
Successfully unfollowed user.
Error unfollowing user.
You have successfully recommended
Error recommending user.
Something went wrong. Please refresh the page and try again.
Email successfully verified.
User Avatar
$50 USD / hour
Flag of PHILIPPINES
$50 USD / hour
It's currently 5:45 AM here
Joined March 15, 2017
3 Recommendations

Stephan L.

@yourapiexpert

monthly-level-three.svgpreferred-freelancer-v2.svgverified.svg
5.0 (17 reviews)
5.8
5.8
$50 USD / hour
Flag of PHILIPPINES
$50 USD / hour
100%
Jobs Completed
92%
On Budget
92%
On Time
14%
Repeat Hire Rate

Certified IoT and LoRaWAN Specialist

Hi, I'm Stephen, your IoT expert. I have a career spanning some 28 years in the telecommunications industry solving complex integration and automation problems which have enabled me to be a highly acclaimed and awarded innovative thinker. Today I take on a variety of challenges blending hardware and software to bring to life innovative solutions in the IoT (Internet of Things) space. Some of the challenges I can help with are: ✅ LoRa and LoRaWAN solutions (I am LoRa and TTN certified) ✅ Hardware solutions with microcontrollers such as Arduino, ESP32, STM32, RP2040 (Raspberry Pi Pico), NordicRF, ATMEL, Microchip, and others ✅ Embedded development using Linux, FreeRTOS, and other tools on Raspberry Pi, x86, and other development platforms. ✅ Edge computing solutions using Docker or balenaOS ✅ Firmware development of Arduino using Arduino IDE or Platform IO in C++ ✅ Low-level device and driver development for the Linux kernel as well as microcontrollers ✅Full-stack software solutions using technologies such as PHP Laravel, NuXT, and Python ✅ Schematic and PCB development using KiCAD, Eagle, Altium or Orcad ✅APIs in any of the 13 programming languages I know ✅API gateways such as Apigee (I am certified), Mulesoft, Kong, and others ✅ Microservices such as AWS Lambda, Google Cloud Functions, and others ✅ Automation with technologies such as Ansible, Terraform, or good old manual code I am a sum of my experiences and all those who came before me. Experience gained through sleepless nights, lost weekends, and holidays finding innovative and permanent solutions to challenges. Other experience has been gained through the skills, advice, and leadership of experts in this field over many years. I am instinctively drawn to interesting and unique projects so if you have a challenge that requires out-of-the-box thinking please do not hesitate to consider me.
Freelancer Linux Developers Philippines

Contact Stephan L. about your job

Log in to discuss any details over chat.

Portfolio Items

For this project, the client required an API-driven solution to use with their industrial monitoring devices. Based upon the API call the device was to either send an SMS text message or make use of text-to-speech software to originate a voice call.

The project made use of a Raspberry Pi 4 and WaveShare GSM HAT (SIM868) as hardware components. Bespoke software was developed in PHP Laravel with which to drive the TTS, text, and modem interfaces.  To prevent modem overload and provide job control a FIFO queuing mechanism was also implemented.

Whilst out of scope the solution was delivered with a full Web UI for future-proofing and to create a more compelling commercial product.

Need something similar?  Feel free to contact me to discuss your requirements.
Automated SMS and Voice Call Solution
This project was to develop custom firmware for the RAK4630 (Nordic nRF52840 + Semtech SX1262) that would allow the customer to provide rapid prototyping.

To achieve this all low-level functions for hardware, peripherals, power, and LoraWAN management were abstracted and provided to the customer as an easy-to-use API for Arduino and PlatformIO.

Additionally a rich AT command set was made available via BLE UART and a specific characteristic and service designed with which to configure the module via the customer's own mobile app.

Need something similar?  Feel free to contact me to discuss your requirements.
RAK4630 Custom Firmware
This project was to create a low-power LoRaWAN GPS tracker. It makes use of the nordic nRF52840 MCU with BLE5.0 and Semtech SX1262 LoRa module.  Additionally, it uses the excellent MAX-7Q GNSS module from U-blox to provide high-accuracy GPS information.

Need something similar?  Feel free to contact me to discuss your requirements.
LoraWAN GPS Tracker
This project was to design interactive RGB LEDs that would change color, intensity, and variance based on incoming audio.

To achieve this an ESP32 and signal processing ICs were used to split the stereo audio into 7 bands (14 bands total). Based on the relative energy in each of the bands, several interesting LED animations were conceived.

Sample videos can be found at:
https://drive.google.com/file/d/1AlmEH94HM50ZXXEP0LAKl747-MTo8JQm/view?usp=sharing
https://drive.google.com/file/d/1ftFI7UTuMgrXMLAGYgRqiEnHWUaY5kog/view?usp=sharing
https://drive.google.com/file/d/1cwmPebnSSsOqX1wMH3wPDZ_FV41O-I21/view?usp=sharing
https://drive.google.com/file/d/1tiYvLzjVGLabY09JB8gDOKmgjBYp-JDc/view?usp=sharing

Need something similar?  Feel free to contact me to discuss your requirements.
Interactive RGB LEDs
This was a project to create a training device for expectant parents on the tender nature and requirements of infants. The device would randomly select between the need for 'attention' or 'affection' making a signal at completely random times during the day.

The parent is to guess the needs of the device and where affection was required would need to stroke a sensor a random number of times.  If the strokes were insufficient the device would 'cry' until the correct amount of affection was required.

For attention, the parent would need to enter the room of the device and stand for a random amount of time in close proximity of the device. If the time was insufficient the device would 'cry' until appeased.

Need something similar?  Feel free to contact me to discuss your requirements.
Arduino Virtual Baby
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway
Full produce development of a coin operated internet access gateway with captive portal, electronic and paper voucher generation as well as incentive and loyalty-based access.
Coin Operated Internet Access Gateway

Reviews

Changes saved
Showing 1 - 5 out of 17 reviews
Filter reviews by: 5.0
€250.00 EUR
Excelent professional. More than just delivering, he tries to understand the why and help with his expertise to improve our projects! Very good documention and explanation of everything he does! Will definatly work with him again!
Linux UNIX IMAP POP / POP3 SMTP
J
Flag of Sebastião C. @jamalrichardsevo
3 months ago
5.0
$999.00 AUD
Stephan is proactive in exploring possible solutions and asks thought provoking questions that changed the anticipated direction of the work and arrived at an even better outcome than I'd envisaged going in to the project. He's professional, personable and completely capable. He spent his own funds on procuring hardware to accelerate the work and I learned a great deal through his open communication as the task progressed. I'm very grateful to have had Stephen's assistance.
User Avatar
Flag of James W. @TechFabrications
4 months ago
5.0
$3,193.75 AUD
Stephen was a godsend for our project. He is very knowledgeable and generous with his advice and opinions. We couldn't have completed it without him. I look forward to working with him again.
Linux Software Architecture Amazon Web Services Internet of Things (IoT) Microsoft Azure
W
Flag of Violeta A. @WHITECATVA09
5 months ago
5.0
$250.00 AUD
Goes above and beyond to make sure everything works as you want, definitely give him a go!
Linux Embedded Software Ubuntu Network Administration Bash Scripting
R
Flag of Ron C. @Ronchapci
8 months ago
5.0
$600.00 USD
Stephen knows his stuff - period.
Linux Electronics Microcontroller Raspberry Pi
V
Flag of Virgar P. @virgarp
9 months ago

Contact Stephan L. about your job

Log in to discuss any details over chat.

Verifications

Preferred Freelancer
Identity Verified
Payment Verified
Phone Verified
Email Verified
Facebook Connected

Certifications

preferredfreelancer-1.png Preferred Freelancer Program SLA 1 87% us_eng_1.png US English 1 82%

Top Skills

Linux 7 PHP 5 Python 5 Software Development 5 Software Architecture 4

Browse Similar Freelancers

Linux Developers in Philippines
Linux Developers
PHP Developers
Python Developers

Browse Similar Showcases

Linux
PHP
Python
Software Development
Previous User
Next User
Invite sent successfully!
Registered Users Total Jobs Posted
Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)
Copyright © 2022 Freelancer Technology Pty Limited (ACN 142 189 759)
There is no internet connection
Loading preview
Permission granted for Geolocation.