Nextion screens make HMI development simpler

800px-Nextion makes nice little TFT screens (up to 7″) that make the HMI (Human Machine Interface) a lot simpler. Instead of having to program a TFT screen just about for each pixel, this lets you design the screen separately and interface through rs232 ttl levels. So far I have tested these screens with ESP8266 and Arduino. But since the protocol is quite simpel any ttl level rs232 device should work. I have tested sofar with baudrates up to 115200 on both hard- and software serial interfaces. more…….

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Cube project into production

Received a very nice photo of the production panels of the Cube project.


for further info on the cube project check its page

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New class library for the 16 bit I2C IO Expander PCA9555

Just finished a simple class library for accessing the PCA9555 I2C IO-Expander using standard Arduino pinMode(), digitalRead() and digitalWrite() functionality.

Check it out on my webpage

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Fishing Rod Varnishing machine

Both my fishing rods needed to be repaired and varnished. However since I did not have a varnishing machine…. I built one with 3D printing techniques.

Motor holder_2

read more….

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Learning STM32 programming

Time changes and so do embedded chips. Having programmed numerous years on Atmel 8bits, PIC, 6502, Z80 and 80×86 I am now learning the 32 bit. Like probably many of us, you try to get a similar environment like my Arduino/Eclipse setup for all development platforms. Well I tried quite a few options on this one:

  • Great environment but only available online
  • MBED exported to Eclipse/gcc. Works fine but still needs quite some tuning
  • MBED generated from boards.txt & platform.txt. Actually got it working for the Nucleo L152RE. Downloading was done separately through the ST-Link utility. Downside was the rather large code footprint.
  • MBED generated for EM::Blocks. Now this is quite an efficient compiler. It works as expected
  • Eclipse. That got me nowhere

Eventually I guess I realized I was postponing the inevitable. I had to restart learning to program for the chip itself. I have a few boards at hand with the STM32F103xxxx and will start with these.

arm exp board Arm-cortex-m3-stm32f103c8t6-stm32-core-board-development-board

As expected, there is hardly any descent documentation available or even a schematic. So a lot of experimenting is required. Any I guess it is my lack of experience with these processors that definitely need an update. And time to leave Arduino style programming and get into the real deal.

My favourite environment currently is:

  • EM Blocks as compiler version 2.3
  • Doxygen is embedded
  • Version control is embedded
  • Use standard templates

I am making this a separate menu Item so I can share my experiences (and have a backup for tips and tricks myself).

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Create your own User commands in the AT demo for ESP8266

I made a small example of  how to create your own functions into the AT demo enabling you to extend the AT example. Of course there is always a risk that we might (probably) migrate soon to another new version of the SDK. To keep you code somewhat safe erasure, I will make a myFunctions.c and myFunctions.h where our functionality will be put in. The only adjustment to the original source code is the file at_cmd.h which contains an array containing all AT commands.

Just try it out. It is quite simple and straight forward. Have fun… and be imaginative!!!

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Installing ESP8266 under Ubuntu and using Eclipse to build projects

Since it seems that so far the SDK works fine in either the Virtual machine with Windows XP) or Ubuntu. I decided to get my own little ubuntu machine to enable me to build projects on a way I am used to. On this page I wil explain how I installed the SDK (following the excellent work of some of my fellow forum people (see ESP8266 forum) who have created the right environment and modified/created specific files), installed Eclipse and how to import the AT example.

For more information join us at . Now a very you forum with a lot of expertise.

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