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 communicates with the hardware via the Blynk server and you can use the mobile interface for displaying sensor data from the hardware nodes or control […]Read More Blynk, PlatformIO and ESP32
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 sensor data (like temperatures or other events) that one or several MQTT subscribers can act on. For an overview of MQTT, Mosquitto and paho-mqtt, see […]Read More A self-hosted MQTT environment for Internet of Things – Part 2
Adafruit hosts a cloud service, io.adafruit.com, where you can upload data from your devices and also subscribe to data from other devices. The service is currently in beta, but you can sign up for a free account to test it. The data is stored in “feeds” and you can configure your own dashboards for viewing […]Read More Exploring Adafruit IO
ESP8266 is a very popular and inexpensive WiFi-chip that can be a real contributor for taking small gadgets to the Internet. I recently bought an Adafruit Feather Huzzah ($18). It is build around ESP8266 which means WiFi-connectivity, but has some additional features compared to the simpler ESP8266 modules available: A USB-port for serial transfer and programming […]Read More Meet the Huzzah!
With an Arduino and some servos lying around, I find it hard not to try out something robot-like. An obstacle-avoiding mini car is probably one of the easiest projects to get started with and as our house is abundant with Lego, the building blocks for the construction are readily available.Read More A Lego robot car with Arduino and servo motors
In my previous post, I experimented with sending measurements values from an Arduino UNO to a Raspberry Pi via a 433 MHz radio protocol. After testing the setup for a few days, I decided to make some improvements: Add an additional sensor for measuring outdoor temperatures. Now there will be four different sensor values transmitted […]Read More Arduino to Raspberry wireless communication – some improvements
The Arduino computers are excellent for reading sensor data, and they are so inexpensive and consume very little power that you can use plenty of them in your home without breaking your wallet. The Raspberry on the other hand, is more powerful, a bit pricier, but can easily be programmed to perform more challenging tasks […]Read More Major Tom to Ground Control – simple radio communication between Arduino and Raspberry