January 24, 2026
QR Codes That Can't Be Copied: Cryptographic Signatures and Time-Limited Tokens
Interactive demo of cryptographically signed QR codes with TOTP-style time limits and one-time use tokens. Scan to see anti-replication in action.
June 20, 2025
RFID vs Barcode vs QR vs BLE: Choosing the Right Technology
Not all tracking technologies are created equal. Learn when to use RFID, barcodes, QR codes, or BLE sensors.
October 24, 2024
How Do QR Codes Work? An Interactive Demo
An interactive dive into QR codes and their various features. Explore information density and error correction.
June 15, 2023
Store Inventory Management with RFID and QR
How to implement store inventory management using RFID and QR code technologies for accurate tracking and visibility.
March 15, 2023
How Your WMS Can Improve Order Picking Efficiency
Warehouse management systems have revolutionised inventory and supply chains.
January 25, 2022
Monitor Your Factory Floor Fleet of ESP Nodes with rsyslog
Track down problems and examine what your ESP32 devices have done on the factory floor.
January 15, 2022
Auto-ID For Asset Tracking
The tracking of various entities in a commercial enterprise, from capital equipment to inventory.
October 20, 2021
RFID manufacturer ? You really should know about GS1 / EPC standards.
In this article I will give you a brief introduction to these standards and show how our raw RFID data gets transformed as it moves through the business process hierarchy.
June 20, 2021
Using client and server certificate bundles to secure and mutually authenticate ESP32 connections
This article will show you some simple steps of how to use client and server certificate bundles to secure your communications and to achieve mutual authentication.
June 20, 2021
stamp_esp32 - a minimal form factor ESP32 development board
While the ESP32 has many development boards available on the market, sometimes you want a minimally sized version that can easily mount on your own pcb.
June 12, 2021
Using SPIFFS to Simplify AWS IoT Integration For ESP32
Manually preparing devices to connect to AWS IoT Core can be cumbersome, especially in large numbers. We present a script to help you prepare devices fast and reliably while storing certificates in the SPIFFS partition.
May 17, 2021
Automating your firmware upload, device-cloud configuration and monitoring for the IoT world
Designing a "smart" product should also include the vision of fast firmware uploading, configuring device with the cloud securely and automation to meet demands and keep important data pouring seamlessly into the cloud.
March 26, 2021
WiFi configuration on the ESP32 over Bluetooth
A simple pre-thought out plan to include this feature could save you huge hassles of re-deployment of your ESP32-enabled WiFi connected devices in the long run.
March 17, 2021
Easy To Use Building Blocks For EPS32 Applications - Network configuration.
Having shipped over 50000 ESP32 powered IoT devices, we have distilled our learnings into easy to use open source building blocks.
March 14, 2021
Hands On With AWS IoT, Timestream and Grafana
We integrate AWS IoT with the brand new AWS managed Grafana, compare it with ODFE and make a recommendation.
March 13, 2021
Selecting a Suitable RFID System For Your Operations
There are multiple RFID standards. we present a few simple rules to choose the right one for your application.
March 10, 2021
Excited by Machine Learning for intelligence at the edge? Make sure it's the right tool for your job.
IoT devices can generate a lot of data, and of course there is a natural interest to apply machine learning techniques to look for trends and patterns. Of course, we have plenty of tools up in the cloud, and it is certainly possible to build a solution this way for some use cases.
March 9, 2021
Easy to use GSM and GPS building blocks for mobile IoT devices
Among the numerous applications that IoT technology has been applied to, there is a large class of applications that need some unique capabilities from their underlying hardware platform in order to enable their construction.
February 18, 2021
Over-the-air (OTA) updating your IoT system? Plenty to think about before you sign up.
Among the more critical building blocks of an IoT solution, and one which should be thought about sooner than later is the concept of over-the-air (OTA) updates to your deployed fleet of devices.
February 17, 2021
Anomaly Detection For IoT Using Open Distro For ElasticSearch
Real time anomaly detection is now part of ODFE and allows applications such as predictive maintenance.
January 28, 2021
Server Side Time Series Plots With Elixir Using Contex
Contex makes creating server side plots easy with Elixir but the documentation could be better.
January 5, 2021
From Metal To Alerts With AWS IoT, ElasticSearch 7.9 and Kibana
AWS IoT and ElasticSearch with Kibana is a classic combination for quick, scalable visualisations, analytics and alerts. This stack has only gotten better in 2020.
December 23, 2020
From Metal To Alerts With AWS IoT, Timestream and QuickSight
AWS IoT and aligned PaaS offerings have come a long way since being launched in the early 2010s. They allow you to build robust, scalable workflows for cloud-connected IoT applications.
December 15, 2020
Websockets for Hardware Engineers - Part 1
Websockets are a communication protocol that allow the creation of persistent, bidirectional communication channels between client and server.
December 3, 2020
IoT's big dirty secret - It's the cloud!
It all arises because of the dependence of the vast majority of IoT solutions on a cloud back-end.
November 7, 2020
Weighty problems, Simple Solutions
When you are building IoT systems, one of the more difficult (and not yet satisfactorily solved) problems is the establishment of the semantics of a measurement that an IoT device reports up the food chain.
November 7, 2020
More from the X-Files... Weird ways to solve IoT measurement problems
No, not those X-Files. I am talking about those interesting measurement stories where we were, like Mulder and Scully desperately seeking a solution to a complicated problem.
October 30, 2020
The Internet of Things Lemon
This is a picture of a simple lemon that I bought in the grocery store the other day. This particular brand of lemon is really juicy. It's also an organic lemon which is important if you are going to use some of the rind for zest in your salad dressing recipe.