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Articles from Martin Harizanov

Visit harizanov.com, subscribe and follow @mharizanov

Meet the PS Thermo

From harizanov.com 3 years ago in BlogsFeatured

PS Thermo is a control hub I developed for proSmart, it is designed to control/act as a gateway for various sub-GHz RF wireless sensors/actuators. In essence, it is a much more advanced version of the BBoilRF thermostat project. The PS…

Embeddica

From harizanov.com 3 years ago in BlogsFeatured

It was roughly a year ago when I decided to spinoff the embedded software/hardware R&D activities I was heading at proSmart to a separate entity. This is how Embeddica was created, a team of highly skilled embedded software/hardware development professionals…

Thoughts on structuring a productive software development team

From harizanov.com 3 years ago in BlogsFeatured

I recently spoke with a friend of mine, who is now a software development team manager in a Fortune 500 listed company. He shared with me that his managed teams work using agile methodologies and consist only of software developers.…

Using mTLS to secure IoT solutions

From harizanov.com 3 years ago in BlogsFeatured

While delivering on the promise of streamlined efficiencies and operational insights, smart IoT devices also present a new and more widespread threat to users and personal data. No one really needs reminding of the security implications of IoT. Think of…

IoT sliding door opener

From harizanov.com 3 years ago in BlogsFeatured

My front gate has joined the Internet of Things and is now controllable from my phone. The sliding door opener is a Beninca BULL 5M. The project is DIY, based on ESP8266 + MQTT and I can now open/close/read the…

Human-Machine Interface (HMI) modeling and implementation using event-driven finite-state machines

From harizanov.com 3 years ago in BlogsFeatured

Modern HMIs are built as graphical user interfaces (GUI) with touch-based user interaction. Complex HMI development is always challenging because of the dynamic nature of the required behavior, underlying functions, and graphical design. Building a PoC prototype through code is time-consuming,…

Experimenting with a 3.5″ TFT

From harizanov.com 3 years ago in BlogsFeatured

I decided to test a 3.5″ TFT version of the TFT32 project as the original version’s 2.4″ 320×240 TFT is a bit small-ish. The TFT I chose is an ILI9488 480×320 3.5″ with resistive touch. The upgrade was pretty straightforward,...

People-Tools-Processes

From harizanov.com 3 years ago in BlogsFeatured

As an IT team manager, I am responsible for forming highly engaged and efficient teams. Building an agile team requires a fine balance of skilled and motivated people, fine-tuned processes and proper tool selection.Put too much focus on people and...

DEV.BG tech talk #3

From harizanov.com 4 years ago in BlogsFeatured

I did a tech talk about the TFT32 project on Feb 5th 2019, here is my presentation, if interested. Some photos from the event: Page views: 8

ESP32 OTA firmware update using compressed firmware image over HTTP (s) / MQTT (s)

From harizanov.com 4 years ago in BlogsFeatured

Performing OTA firmware update over a slow/unreliable connection may be challenging. I have had many cases, where the nodes to be updated are in a remote rural area with a 2G modem internet connection, and pushing a 1.1MB firmware file...

ESP32 OTA using MQTT over SSL as transport and Node-Red as the bin image provider

From harizanov.com 4 years ago in BlogsFeatured

Page views: 9

Thoughts on time/date management on IoT nodes

From harizanov.com 4 years ago in BlogsFeatured

Accurate time/date information is crucial for the correct operation of IoT nodes. From a security perspective, time/date information is necessary to perform SSL certificate validations. If your embedded device’s clock isn’t accurate, you can’t ensure the presented server certificate hasn’t...

TFT32 Wi-Fi configuration GUI

From harizanov.com 4 years ago in BlogsFeatured

I am working on a thermostat control project using the TFT32 hardware, let me share a video of the Wi-Fi configuration GUI (still work in progress). The Wi-Fi provisioning via GUI addresses one of the significant challenges when setting up...

TFT32 – ESP32 based IoT control hub/gateway with TFT, RFM69 and more

From harizanov.com 4 years ago in BlogsFeatured

Those of you that follow me on Twitter might already know that I’ve been working on an ESP32 based IoT control hub/gateway project with touch TFT lately. Let me describe what problems I am trying to address with this project....

DIY swimming pool solar heater

From harizanov.com 4 years ago in BlogsFeatured

We have a 4.88m x 2.74m x 1.22m (13m³) Bestway swimming pool in the backyard. We only use the pool when the pool water temperature is > 25°C, but it only happens if there are intensive sunshine and high ambient...

Enhancing my ordinary IP security cameras with AI

From harizanov.com 4 years ago in BlogsFeatured

Artificial Intelligence is quickly becoming an important ingredient for IoT projects’ success, a requirement for unlocking its full potential and providing a competitive edge to those that embrace it. AI naturally integrates into existing connected sensor/actuator networks and immediately adds...

DEV.BG tech talk

From harizanov.com 4 years ago in BlogsFeatured

I will be doing a tech talk on topic “Hardware and firmware considerations when designing low power battery operated wireless edge nodes for Internet of Things applications” at an event organized by DEV.BG. Join me on April 18th, starting 19:15...

Where are the IT jobs in Sofia located?

From harizanov.com 4 years ago in BlogsFeatured

I had a chat with a colleague the other day, discussing his property purchasing plans. He shared that the proximity to workplace is important for him. Planning in the long term, he asked me what districts of Sofia would be...

Upgrading my fan coil thermostats

From harizanov.com 4 years ago in BlogsFeatured

We use DIY air-to-water heat pump for climate control (heating/cooling) of our house with a combination of water underfloor heating and fan coils in the rooms. The fan coils are equipped with basic thermostats that allow for heat/cool mode setting, desired...

Internet connected fire/smoke alarm project

From harizanov.com 4 years ago in BlogsFeatured

This project is an upgrade to a previous project of mine – the DIY IoT smoke alarm. It is a more advanced version that uses dedicated hardware rather than the generic “Funky” project + external components. In essence the module...

High security keyfob project

From harizanov.com 5 years ago in BlogsFeatured

This project is about creating a high security keyfob using Atmel’s ATSHA204 hardware authentication device. It was inspired by this post about security and signing. Many modern keyfobs use various security techniques to prevent replay attacks, yet it turns out it is...

BBoilRF

From harizanov.com 5 years ago in BlogsFeatured

This blog post is about a project I have been working on lately, the BBoilRF. It is a general purpose internet-connected relay actuator/gateway with support for low power, battery operated remote wireless sensor nodes. It was designed primary for use...

proSmart

From harizanov.com 6 years ago in BlogsFeatured

I have been busy starting up an exciting new project the last few months, a joint effort with a team of highly enthusiastic, hands-on, broad skilled contributors with the goal to design and develop IoT home/industrial automation solutions. Together, we established...

Auto DST adjustment

From harizanov.com 6 years ago in BlogsFeatured

We are close to that time of the year, when Daylight Saving Time (DST) starts.  It is intended to save on energy use, however studies have found this to be questionable, even contrary – energy use increases in some cases. The change itself...

FOTA update without external flash for Atmega32U4 + RFM69

From harizanov.com 6 years ago in BlogsFeatured

I’ve blogged before why firmware-over-the-air (FOTA) updates are a must-have nowadays, however my old AVR+RFM based projects were incapable of that due to the lack of external flash to temporary store the new firmware before it is flashed on chip. The...

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