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Water Level Logger – voltage level conversion

Posted on 2014/03/31 by andy

Digital subsystems with different supply voltages have to align their logical states if they want to talk to each other. It can be done with variety of discreet components as well as dedicated integrated circuits. It is simple task these days with google. Things get trickier if one side needs to be powered off, to save energy for a start. Testing each case scenario with breadboards gives early warnings if something is wrong. I was just too… Continue reading →

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One wireless device to rule them all

Posted on 2012/10/26 by andy

Staying at the hotels too much, sometimes I am facing penny-pitching network policies like “pay for each device separately” or having just a cable network. With the advent of smartphones and tablets such policy is smart move as we think of sucking down clients’ wallets. If you are traveling in business, chances are you have a laptop with WiFi and Windows 7 or newer; with that equipment and without additional software you can… Continue reading →

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Water Level Transmitter – digitization

Posted on 2013/10/09 by andy

It was a long and bumpy way from taking pressure transducer hardware in my hands to having stable digitized values. Most of the time I spent learning instrumentation circuitry from app notes and books, just to make sure the solution meets assumed precision despite budgetary approach. Finally constant current bridge driver, precision operational amplifier and sensitive analog-to-digital converter did a job. For non budgetary approach… Continue reading →

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Custom container with SPARK UI toolkit

Posted on 2016/11/12 by andy

Salientprocess acquisition by IBM will make SPARK toolkit core part of IBM BPM in future release. SPARK introduces some nice new concepts, one of it is addressing that keeps SPARK containers invisible. Its public API promises to make your own coach view a container and I needed it on my code. So I tried and it did not work. Few hours of experiments with debugging SPARK code led me to workaround and defect report. SPARK UI toolkit is built on… Continue reading →

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3D printed rain gauge

Posted on 2016/02/08 by andy

Water level monitoring on river basin under observation was completed mid 2015. From rainfall-rainoff modelling perspective rainfall capturing was missing. Low budget, 3d printer at home and some spare time pushed me to design my own rain gauge. Before autumn rains all required stations received tipping bucket pluviometers upgrade. Mechanics of tipping bucket gauge I use in test station for last 2 years is based on simple concept of magnet… Continue reading →

Posted in 3D printer, Electronics | Tagged | 8 Comments

Water Level Transmitter – RS-485

Posted on 2013/11/05 by andy

Serial transmission over long line was the last stage of first iteration in prototyping. Local communication between microcontroller’s USART and PC was already working with MODBUS thus adding RS-485 driver and couple passive elements meant to be piece of cake. Murphy’s law got me down as I should have expected. The idea is simple – from MCU perspective USART’s transmission lines RX/TX are connected to RS485 driver. Using s… Continue reading →

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Water Level Station – field tests

Posted on 2014/12/29 by andy

Solar panel, probe and main unit is part of my balcony landscape for over a year now. This setup is running from many weeks to several months uninterruptedly depending purely on firmware upgrades. Field tests being final proof are needed though mainly to simulate shallow running water in freezing weather conditions. This is why two stations were deployed before this winter. Main unit box survived last winter with weeks of cloudy weather and… Continue reading →

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New skates on the block

Posted on 2011/07/28 by andy

My Salomon Crossmax skates are history. For a long time I could not decide which skates would replace them well. Finally I got Powerslide Metro freeride skates, because they receive positive comments, because I checked them personally and because… I got discount. Last year, when original liners have just torn apart after washing, I fit in used Seba liners as I bought new liners for Seba shells. I was quite happy since urban skating was… Continue reading →

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rammod-prep

Posted on 2011/03/17 by andy

Unsoldering preparation Continue reading →

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FreeRTOS on Atmega8?

Posted on 2013/07/22 by andy

How to compile FreeRTOS real-time operating system on 8-bit AVR microcontroller Atmega8? It is not supported out of the box as well as google hardly helps with that issue. I did some experiments and understood why people are not doing this. I have posed this rhetoric question some time ago while finishing winter decor e-snowflake toy based on Atmega8. Lately during my much more complex project I returned to this idea as I planned to use… Continue reading →

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