How to instantly replace existing Raspberry Pis by the ESP8266

For my outdoor sensors I used an RaspberryPi with BMP180 + TSL2561 via I2C transferring the sensor data via MQTT messages. During an IoT Meetup Session at codecentric office in Frankfurt we discussed the usage of an esp8266 and I was thrilled to get one and play with it. Adafruit HUZAAH ESP8266 breakout highlights 80-MHz-Mikrocontroller Wi-Fi… Continue Reading How to instantly replace existing Raspberry Pis by the ESP8266

SweetHomeHub: Home Control with Raspberry Pi and MQTT – Part 1

Since quite a long time I am working on my universal Raspberry Pi based Intertechno-Remote (see former posts 1 2 3 4): I tried different approaches to trigger/control my remote control service via a custom HTTPServer/-Handler and a simple Vert.x verticle. Since MQTT v3.1.1 turns out as on of the de-facto standard protocols for the… Continue Reading SweetHomeHub: Home Control with Raspberry Pi and MQTT – Part 1

MQTT.fx 0.0.10 released

MQTT.fx 0.0.10 was released. Download latest binaries in all flavours at mqttfx.org. Bugs and feature requests can be reported via the issue tracker. New in this version: MQTT-Message Clipboard Option to copy the message payload to clipboard Service menus at publish and subscription panel: now you can clear received messages buffer and the recent topics… Continue Reading MQTT.fx 0.0.10 released

MQTT.fx 0.0.9 released

A new version of MQTT.fx is available (probably the last release before JavaOne) Download latest binaries in all flavours: mqttfx.org. Bugs and feature requests can be reported via the issue tracker. This release comes with some new features: Message Font Size (in respect to Gerrit Grunwald @hansolo_) To improve ledibility of large message bodies now… Continue Reading MQTT.fx 0.0.9 released

“PiMac unibody” or a new home for my touch screen

In preparation for the JavaOne 2014 Session my 7″ touch screen from Chalk-Elec finally found a new home. I bought a 1 mm sheet of aluminium and treated it with my jig saw and a rasp and folded a triangle stand for the screen. Basically there would be room enough for e.g. a Rapsberry Pi… Continue Reading “PiMac unibody” or a new home for my touch screen

MQTT.fx 0.0.3 released

Download latest binaries HERE. Most significant change: I have added a pane to show some status values of the broker: In v0.0.3 these $SYS topics are recognised (Tooltips are showing the descriptions): Version: $SYS/broker/version Build: $SYS/broker/timestamp Uptime: $SYS/broker/uptime Subscriptions Count: $SYS/broker/subscriptions/count Changeset: $SYS/broker/changeset Clients Connected: $SYS/broker/clients/active Clients Expired: $SYS/broker/clients/expired Clients Disconnected: $SYS/broker/clients/inactive Clients Maximum: $SYS/broker/clients/maximum… Continue Reading MQTT.fx 0.0.3 released

NetBeans 8 – Shortcut to Remote Platforms

The recently released NetBeans 8 holds a great gift for all Java Embedded Developers: Build-in support for Remote Java Standard Edition platform. To introduce this great and handy feature I created some screencasts: Part1: headless Part2: JavaFX on Pi Part 3 – Remote Platform Debugging José Pereda has also blogged about this feature in action:… Continue Reading NetBeans 8 – Shortcut to Remote Platforms

Between 0 and 1 – PWM with Raspberry Pi

Between 0 and 1 – PWM with Raspberry Pi

Switch on and off an LED and let run a motor at one speed and direction is easy, but what if I want to e.g. control the brightness of an LED or control motor-speed? A kind of analog signal is needed: This is done with Pulse-width modulation (PWM). PWM is a “modulation technique that conforms… Continue Reading Between 0 and 1 – PWM with Raspberry Pi


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