Blynk, PlatformIO and ESP32
Blynk is an IoT-platform that consists of a Blynk server, custom projects within an iOS/Android mobile app and custom hardware IoT-nodes (Arduinos etc) using a Blynk library. The mobile app…
Category: Arduino
Using CH340 devices with OSX Sierra
I have several low-cost development boards that use the CH340/CH341 usb-to-serial chip for usb communication. Unfortunately, with OSX Sierra, the official CH340 driver cause a Kernel Panic (freeze + reboot)…
The Sensor433 library and Geeetech transmitters and receivers
As I use 433MHz transmitters for sending sensor data from many of my IoT-nodes, I have made a re-usable Arduino library for this purpose. The transmitted sensor data is picked…
Radio chirp data incorporated in an MQTT environment
Internet-of-things does not require that every device has to be directly connected to the Internet. The complexity and possible security issues with every sensor having its own IP address would in…
Processing and Arduino
Processing is an open-source IDE with a Java-based programming language that is aimed at lowering the learning threshold for interactive graphics creation. It can be used for teaching programming, making prototypes,…
A low energy open door detector with radio signals and MQTT
This blog post describes how I have set up a door-open detector at home. It uses a small ATtiny85 board that broadcasts a 433 MHz signal every time the door…
A self-hosted MQTT environment for Internet of Things – Part 2
In the second post in this series, I will setup two ESP8266 microcontrollers with MQTT publishing through a Raspberry Pi-hosted Mosquitto broker. The idea is that the microcontrollers will send…
RCSwitch revisited – control RC outlets with a web app
In two previous posts, I used the RCSwitch and pi-switch libraries for communication between an Arduino Uno and a Raspberry Pi. I touched briefly on the main purpose with these libraries…
Thingsmatic 