https://nantipov.org/posts/ Recent content in Posts on Engineer's notes Hugo -- gohugo.io en ©{year}, All Rights Reserved Wed, 21 Oct 2020 11:52:50 +0200 https://nantipov.org/2020/10/job-looking-situation/ Wed, 21 Oct 2020 11:52:50 +0200 Wed, 21 Oct 2020 11:52:50 +0200 https://nantipov.org/2020/10/job-looking-situation/ English Hello everyone, Hello Welcome to the special landing page for recruiters and creative people interested in contacting me. I am writing this to bring some information in regard of my current situation. First of all, thank you for visiting my profile and being in contact with me. I am always open for communication and glad to help. Not looking for a job for now At the moment I am not looking for a job. Nikolai Antipov en de ru recruiting en de ru recruiting https://nantipov.org/2020/09/hunter-secretary/ Mon, 21 Sep 2020 11:52:50 +0200 Mon, 21 Sep 2020 11:52:50 +0200 https://nantipov.org/2020/09/hunter-secretary/ Problem statement I have quite a number of unprocessed mails and messages in variety of communication platforms from recruiters. I respect people, but unfortunately cannot respond everyone in a fast manner. It takes time and therefore creates a back-pressure problem in a condition of consumption performance is lower than producing one. Number of incoming messages is growing every week. Solution I want to read a message, review it and put a label or mark it somehow indicating appropriate type of response: Nikolai Antipov featured image en recruiting java hunter-secretary gmail google-auth markdown html templates en recruiting tech https://nantipov.org/2020/02/mono-motor-driver/ Sun, 09 Feb 2020 13:05:34 +0100 Wed, 12 Feb 2020 00:00:00 +0000 https://nantipov.org/2020/02/mono-motor-driver/ Goal The goal of this Mono iteration is replacing the motor driver. In the earlier published post it was mentioned that L298N motor driver creates a significant voltage drop. Well, I decided to go with the TB6612FNG chip as of the Pololu motor driver. Pololu motor driver TB6612FNG Designing the Mono driving module Requirements Okay, we have four motors and two motor drivers with the following pinout. Pololu motor driver TB6612FNG pinout Pin on the left Description I Description Pin of the right GND Logic ground I PWM for the engine A PWMA VCC Logic VCC 2. Nikolai Antipov featured image tech tinker en mono robot rover tb6612fng motor-driver pca9685 raspberry-pi tech tinker en Mono https://nantipov.org/2020/02/mono-power-supply/ Sat, 01 Feb 2020 13:05:13 +0100 Wed, 12 Feb 2020 00:00:00 +0000 https://nantipov.org/2020/02/mono-power-supply/ Goal The goal of this Mono iteration is improvement of the power supply setup. In the previous post it was mentioned that the Raspberry Pi and other infrastructure would be supported with two separated sources. Single battery with huge capacity and 7.4V voltage I came up into solution with Li-Po battery which is known as long lasting power supply. This is a battery up to 5200 mAh capacity and 7.4V voltage. Nikolai Antipov featured image tech tinker en mono robot rover power-supply lipo raspberry-pi tech tinker en Mono https://nantipov.org/2020/01/mono-first-steps/ Sun, 26 Jan 2020 15:27:19 +0100 Mon, 24 Feb 2020 00:00:00 +0000 https://nantipov.org/2020/01/mono-first-steps/ Introduction Let me introduce Mono. It is a small rover which I am going to build using simple set of existing modules. As a base the ready chassis has been taken. And here is the initial version for further experiments. Mono view #1 Mono view #2 Components Let’s start with the following things: Chassis with four motors; Motor drivers L298N (2x); Controller for generating PWM impulses PCA9685 (speed control); Brain as Raspberry PI Zero with WiFi; Batteries and power bank. Nikolai Antipov featured image tech tinker en mono robot rover raspberry-pi pca9685 l298n tech tinker en mono mono https://nantipov.org/2019/12/converting-site-from-wordpress-into-hugo/ Sat, 14 Dec 2019 12:34:57 +0100 Sat, 14 Dec 2019 00:00:00 +0000 https://nantipov.org/2019/12/converting-site-from-wordpress-into-hugo/ What actually happened? My wife owns a web-site which was powered by WordPress. Some time ago we decided to switch into static solution without databases and constantly running page generating / rendering process. Idea was great, but I came to it quite late - just a day before hosting contract should be prolonged. Trick was in switching also into another environment where only static files can be served. Having this, the Nikolai Antipov featured image tech en ru wordpress hugo java spring-batch converter freemarker jsoup tech en ru fix java https://nantipov.org/2019/07/fixing-samsung-led-ue49mu6179/ Sat, 27 Jul 2019 23:37:41 +0200 Sat, 27 Jul 2019 00:00:00 +0000 https://nantipov.org/2019/07/fixing-samsung-led-ue49mu6179/ What actually happened? My TV stop working at some point in time. The red dot does not light up and nothing happens. Checking what is inside Hope to have fuse problem which could be simply fixable. Disassembly Start with two holes on the bottom for getting cover off and then pull it step by step, latch by latch. Left Disassembly hole Right Disassembly hole Ah, it is not a fuse issue Here is what I saw. Nikolai Antipov featured image tech en tv led samsung ue49mu6179 bn94-12439c tech en fix https://nantipov.org/2019/03/gsm-7bit-pdu-encoding-algorithm-in-java/ Fri, 01 Mar 2019 11:58:21 +0100 Fri, 01 Mar 2019 00:00:00 +0000 https://nantipov.org/2019/03/gsm-7bit-pdu-encoding-algorithm-in-java/ Text to 7-bit PDU string converter Being honest I forgot why I had written this code some time ago. I put it here from my another small blog page hosted on blogpost (engnick.blogpost.com). Now I remember how was it and decided to bring this piece of code, as maybe it might be useful for somebody. I wrote this code when I was working in MegaFon as part of automated testing tool for Nikolai Antipov tech en java gsm pdu 7bit converted sms ussd msisdn tech en java https://nantipov.org/2019/02/recovering-of-data-from-damaged-and-quickly-formatted-hdd/ Mon, 18 Feb 2019 14:07:13 +0100 Mon, 18 Feb 2019 00:00:00 +0000 https://nantipov.org/2019/02/recovering-of-data-from-damaged-and-quickly-formatted-hdd/ What actually happened? Friends asked me to check what can be done for “fixing” some “broken” hard-drive. So, what we have? Hard-drive 2.5" 500 Gi SATA; Correctly detected by Windows machine in 3 over 10 times; There are lots of pictures, images, songs, videos very important for owner and his wife in particular; Should be NTFS partition. Quick remark: I am not a professional data recovery guru, so here is just Nikolai Antipov featured image tech en hdd recover quick-format raspberry-pi raspbian testdisk photorec ddrescue organizemusic tech en fix