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Wilko Vehreke
Works at Freelancer
Lives in Frankfurt am Main
59 followers|270,384 views
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Wilko Vehreke

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As a small side project I've built a tiny circuit which transfers a freezer into a fridge. Why? My father bought a small freezer for his camper because it was cheap. But what he really wanted was a fridge. So I grepped an Arduino pro min, a DHT22 sensor and a SSR (solid state relay) and spent some time with testing...
TransformFreezerIntoRefrigerator - My father has a tiny camper with a freezer but without a refrigerator. This sketch uses an Arduino Mini Pro, a DHT22 and a solid state relay to switch the freezer...
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Wilko Vehreke

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The ESP8266 is a little powerful microcontroller with nice specs (https://en.wikipedia.org/wiki/ESP8266). Wouldn't it nice to execute your Arduino sketches directly on it? Check this side out: https://github.com/esp8266/Arduino.

The only downside is, that not all libriaries out there are 100% compatible with it. But with some effort you can make more or less everything work.
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Wilko Vehreke

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Current state of work: I can configure the ESP8266 to act as a station or an access point. The power supply is currently a simple 5V / 3V3 breadboard adapter. This makes it easy to test, but must be reworked for the final circuit. 
I've added to USB/FT232 adapters. One connects to the hardware serial port and enables me to upload sketches, the second serves a software serial connections to export debug messages. 
I've to disconnect the first adapter during tests (ESP8266 needs a hardware serial connection and the arduino pro min has only one serial port) I needed a 2nd port.

Next step is to enhance the android app to connect to the ESP8266 (in access point mode), send network credentials that the ESP8266 can connect to the home network.
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Wilko Vehreke

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Set of useful AT commands to control the ESP8266
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Wilko Vehreke

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Perfect tutorial with a simple circuit and a step by step description how to upload new firmware versions. 
Updating the firmware in an ESP8266 Wi-Fi module can be frustrating! Here's a procedure to reduce the pain.
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Wilko Vehreke

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why are so many rights are needed by the app?
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Alexander Diana's profile photoWilko Vehreke's profile photoFleksy's profile photo
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Fleksy
 
Unfortunately, these are standard permission requests for all keyboards. You can rest assured, Fleksy does not collect any personal data without your explicit consent. You can read all about this voluntary program, under Settings/Improve Fleksy. Thank you for installing Fleksy Beta!
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Wilko Vehreke

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Your LCD display (Liquid Crystal) does not know all the characters you want to print. The reason is, that the HD44780 (https://de.wikipedia.org/wiki/HD44780) does not have all of them. But you can solve this problem by defining / designing your own symbols by using the online tool: https://omerk.github.io/lcdchargen/.

But be aware. The attached code doesend work for me. What they do in the setup is:

// create a new custom character
lcd.createChar(0, customChar);

// set up number of columns and rows
lcd.begin(16, 2);

But that didn't work for me. Just flip the order:

// set up number of columns and rows
lcd.begin(16, 2);

// create a new custom character
lcd.createChar(0, customChar);
Example Arduino Sketch. (LiquidCrystal library reference) #include // initialize the library LiquidCrystal lcd(12, 11, 5, 4, 3, 2); byte customChar[8] = { 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000 }; void setup() { // create a new custom character ...
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Wilko Vehreke

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Looking for a working library for an I2C based LCD display (LiquidCrystal)? Check this out:
Arduino-LiquidCrystal-I2C-library - Library for the LiquidCrystal LCD display connected to an Arduino board.
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Wilko Vehreke

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List of ESP8266 AT commands with description and examples
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Wilko Vehreke

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Nice reference for c++ classes, functions and objects.
Description of the most important classes, functions and objects of the Standard Language Library, with descriptive fully-functional short programs as examples: C library: The popular C library, is also part of the of C++ language library. IOStream library. The standard C++ library for ...
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Wilko Vehreke

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This is my current state of work to connect an Arduino Pro Mini and an ESP8266 V1 Board. 
I'm not so happy with the power supply but to write the sketch it is okay for now
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Wilko's Collections
Story
Introduction
When I'm not working I am taking photos, improving my digital art skills or developing some LR or PS plug-ins. Perhaps developing android apps is something I could enjoy.

Definitely I enjoy seeing my niece grow up. 
Bragging rights
More and more I want to have my own 3D printer. The only "buts" I've in mind: "Are the desktop versions able to print smooth edges and surfaces" and "Is it a good idea to wait for colour 3D printers?"
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Currently
Frankfurt am Main
Previously
Leer - Hamburg
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Email
Work
Occupation
Software Architect and Developer
Skills
Developer, Architect, SOA, TIBCO
Employment
  • Freelancer
    Software Developer and Architect, 2006 - present
  • Reuters Group plc
    Consulting / Business Consulting, 1997 - 2005
  • System Soft
    Developer, 1997 - 1997
  • CAP debis MEB
    Developer, 1993 - 1996
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Male
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