Kategorie: Technology

ESP8266 and C1101 433 MHz KERUI Receiver

I wanted to include a cheap magnetic window sensor into my MQTT system using ESP8266 connected to WIFI. I came across this nice sensor which emits 433 MHz signals for OPEN, CLOSE, TAMPER and LOW BATTERY. It costs around 6-7 € per piece which is rather low compared to other sensors. KERUI D026 on BangGood […]

MQTT based Leinwand Remote Control

I wanted to make my motorized canvas MQTT-enabled so that it can be embedded into greater automation scenes.  For this I have taken an ESP8266 controller and attached some (left over) relais to it. The yellow cables attach them to the original wireless sender board which talks to the motorized canvas. After connecting to my […]

MQTT brightness device using Alexa Echo Dot

In contrast to my previous posting this code announces an IoT device supporting a brightness slider, basically a lamp using Espalexa. #include <PubSubClient.h> #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <WiFiClientSecure.h> #include <WiFiServer.h> #include <WiFiUdp.h> #include <Espalexa.h> #include „ESP8266HTTPClient.h“ #include „ESP8266httpUpdate.h“ const char* FIRMWARE_VERSION = „1.0“; const char* ssid = „_REMOVED_“; const char* password = „_REMOVED_“; const char* mqtt_server […]

MQTT switch using Alexa Echo Dot

Ever wanted to control your ESP8266’s through Alexa and Echo Dot and build fancy shit? fauxmoESP emulates the protocol used by Wemo IoT devices. Later versions emulate Philips Hue protocol and allow numeric values and allow something like „set value to 42“. Unfortunately 3.0.0 is not compatible with Echo Dot 2nd and 3rd generation. Add ESP8266WiFi, PubSubClient […]

MQTT-enabled (unintelligent) IoT Speaker using Amazon Polly

My home is full of ESPs and pieces of serverside MQTT-enabled bridges. I wanted to enable the network of sensors and nodes to produce intelligent and rich TTS output. Use cases were: Motion detection when blinds are closed should lead to a decent message Summary of door bells during the day including the timestamp TTS […]

A Home for the Printer

I have mounted an Ikea Stuva (35€) on the wall, where my A8 perfectly fits in. Below I have a 10cm room for electronics and stuff. The front is made of 4mm plexi glass. On the left and right side wall a warm white LED bar illuminates the printing room. Of course all plastic parts were printed […]

Maker: Anet A8 MOSFET protection

A8’s mainboard provides no strong MOSFET for controlling the heat-bed and the nozzle. Both components draw easily 15 A through the mainboard and the bed is limited to around 50°. It is important to get these 15 A away from the mainboard, otherwise it will surely burn down some day. I got those 30 A […]

Maker: My Anet A8 3D printer parts arrived

My Anet A8 finally arrived from HongKong. The build time was around 4 hours (parts 120 €) and it is no problem at all if you bring in some patience and tools. There is numerous open source enhancements available on Thingiverse to produce even better quality. Especially belt tensioner, cooler and bearings, the rest is more […]

Remote Packet Capture on iPhone

Step 1: Plug your iOS device into the USB port of your Mac Step 2: Use the Xcode organizer to obtain the UDID of the device # Mount virtuel network interface: $ rvictl -s <UDID> # List active devices: $ rvictl -l # Use wireshark or tcpdump: $ tcpdump -n -i rvi0 # Unmount virtuel […]

OSX Keyboard Shortcuts

For all you mouse-using maccies .. use this: ⌘+i Shows information about selected object in finder ⌘+⌥+i Shows an static information window which always shows information about the selected object in finder ⌘+⌥+h Hide other windows (except the mot top one) ⌘+shift+3 Save full screenshot to desktop ⌘+shift+4 Save selection screenshot to desktop ⌘+⌥+eject Sleep […]

IPv6 Day

You may reach my blog via the IPv6 internet for sure :-) It has been a long time since the mid 90’s when IPv6 was first initiated. Since then, not much happened. Almost no MNO uses IPv6 on a productive basis, except very very few ones. Even less landline providers make their beta tests available […]

Ministry Of Finance BlackBerry PlayBook App

Last winter holiday I participated the RIM App Developer competition where RIM handed out free BlackBerry PlayBooks to people who developed an app for the new platform. To make the story short, finally I got such a tablet from RIM by publishing the following app … Ministry Of Finance is an intuitive and lean BlackBerry […]

My new BlackBerry PlayBook !!!

Finally I got my BlackBerry PlayBook. I participated at the „Free PlayBook Offer“ program and handed in an personal expense tracking application. And my app got approved, so I am the proud owner of a PlayBook now :-)

Software Suppliers Vocabulary

Today I found something really funny on the web … Software Suppliers Vocabulary: ALL NEW Software is not compatible with previous versions. ADVANCED DESIGN Upper management doesn’t understand it. BREAKTHROUGH It finally booted on the first try. NEW Different colors from previous version. DESIGN SIMPLICITY Developed on a shoe string budget. EXCLUSIVE We’re the only […]