Schlagwort-Archive: arduino

nodemcu and arduino

having such small device, with wifi and many analog and digital i/o ports by hand, is somehow nice. that general purpose input output connectors are known as GPIO….. the loveley mr. wang from hongkong, tower 4, building c had send me that esp8266 v3 (340) board within the second week, directly from china, by airmail.

device ports with addresses

that device ( nowerdays called „iot device“ ) can be used as serial bridge, for incomming / outgoing signals. a little more sophisticated is the idea, to send all the data by http with tcp/ip or as udp paket. a lot of traffic can be estimated, beside failure correction , missing paket and other crapy errors, that are common.

pushing a json string that way, triggered, when the value changes, could be more gentle to the chip. the unknown state of the receiver is the pitfall there. using websockets on the nodemcu will work with some message client, like mqtt, is the next climbing. the client subscribes to a master ( tomcat / rabbit mq or pure servlet with extras )  and  delivers the information straight there. the server will handshake the  request with a response, directly to a open port, on the client ip.

should be all, will see, when the code is working as expected. 20 sensors with 50 samples/second could mean 1000 requests per second – commonly. if nodemcu/raspberrypi3 is able to feature all that, is the question for the comming days. the arduino is something one have to learn, how to use  that efficiently is the first step. the next is, to have some java ide, like eclipse ready with java, then tomcat and a dbms or storage engine, like mariadb installed within a virtual machine, with the same debian, that is used for raspberrypi, that is called raspian. then the code delivery or the binaries should work on both enviroments, even if the architecture will differ between amd and arm.

a related story was some years ago, the teensy to get into the mac


what to to, when a dude smashes a harddrive from a mac? the new drive dosnt have a clue about the ingredients of the machine, the firmware/bios is like a sissy to not let the owner accessing the system. several ways to get into the mac osx, but over the years, the rules went harder and one should explain the story to the support at some point.

top view


apple puts a lot of energy into their politics, to seal the borders of that system and to save the mac from other influences, except theirselfs. icloud is nowadays a default package, the most services, like imessage, is backed up in the cloud. no way to use such devices without such id for that storage and control of puzzlepiece. the mac is locked until the code of consumption is entered or penalty is payed to apples money-machine via customer care. fucking with assemblercode, to tweak the bios with u/efi and all that shit, is not even a plan. the firmware to restart the system is hidden within some hashes from the mainboard and the password itself, reverse engineering was not my plan for today.

windows programmer
ready or not, depends on the configuration of buttons and lights. this picture indicates a working chip.

if the mac is hanging on the four number code, to get back to live, one could call the customer care to get a scbo file or try typing the nearly 9999 combinations by hand. others are lazy to do so, a small processor, based on arm with 64kb ram, can do the same, much more gently. the tiny pcb ( printed circuit board ) with a size of 35 x 17mm holds a usb-connector, the cpu with 256kb rom and a lot of connectors to participate with others.

the firmware tells its a v.1.03, flashed with the customized arduino ide   ( integrated desktop enviroment { development tool } ) within seconds on the freescale MK20DX256, but with some difficulties. arduino is not just a misswritten word, they could be seen as major pusher behind that uprising developer-board-scene. that teensy is a clon in some way, but in fact, arm or atmel had a product line over the past years, so one can find several configurations, sources and dealerprices, to get into the rush of diy, for a fistful flies. another eclipse plugin should be named, but i had so-so results on the download site, all files were incomplete,  i guess the traffic limit is taken, on the end of the month. the project should move to the next level then.

chip is ready to reboot
update cycle finished

as i hadnt much experience with avr/atmel chips at all, i decided, to put everything in a virtual box, on windows 7 for some reasons. but suprise suprise, the winavr-toolkit wants to lay inside the default folder ( ${winDrive/winavr } ) instead of being sorted with others in the standard folder for program files (x86). anyhow, the masterpiece of microsoft is, that the usb port and parameter is buffered/saved within the registry and due to other lacks of their understanding of software design, the programer wont flash the hex.code from the arduino software into the chip. excellent, couple of hours later i gave up on this, as i wanted to use eclipse for larger developments.

so, burning the working code to the chip was only possible, with a direct connect to the host-system.  some years ago, i played with a atmega ( think was …32 ) for a laser-tester, that one had started with basic-code. the arduino enviroment has its own syntax and file-extension.ino and with gnu, c/c++ software the architecture could be cascaded.

happy hour for the chip
upgrade sucessfullly, the new code is flashed to the soc

so, the chip is now ready to stupidly check each number, from 0000->9999 until the mac agrees to work again, when the correct passcode is clearly analyzed, by try& error. oh yeah, the soc could do much more then this, but the case was just there, to check the stuff with a goal to reach. some dozen projects and use-cases for that little machine is visible on the web: dj-controller, measurement boxes with lcd displays or game-engines are out there and many other ideas are just eyeblinks away.

bigger or larger projects will clearly need some more attention and notes to be realized, but with a sd-card-slot in dollar-distance, the bugs for a unique or genuine solution is definitly no high steak or far away. things can be made and grown with developer kits, analog or digital interfaces, up to the samplerate of a oscilloscope or analyzer by mean.

windows programmer
ready or not, depends on the usb connection and windows is a sissy in that area, after 15 years of existance, a unhappy programmer with no chance to pump new bytes into the chip.