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Panel Instruments. The Dupla CO2 System. Tropical waters, especially flowing waters, exhibit a surprising degree of stability, independent of the season, water level and light conditions.

The Dupla CO2 System

Factors such as pH value, CO2 content, degree of hardness etc. show only a slight fluctuation in range. Therefore, stability of all parameters is of great importance for the aquarium as well. The Dupla CO2 system ensures stability in the aquarium: 1. Constant pH value. In the optimum community aquarium where tropical fish from geographically and chemically differing waters can be cared for, a neutral pH value is recommended. The CO2 system also offers great advantages for the specialised aquarium in which special fish species, such as discus fish, can be cared for or bred. 2. If an aquarium suffers from CO2 deficiency, the following will occur: Carbon is chemically bound in carbonates. 3.

Submerged water plants obtain their carbon requirements preferably from dissolved gaseous carbon dioxide in the water. Telecomenzi, difuzoare, amplificatoare, componente electronice, cabluri si mufe. Untitled. Forumul electronistilor. CadSoft Eagle Professional 5.11.0 - FULL! - Sonsivri. Preparation of pH buffer solutions. Controller pentru acvariu. De ceva timp sunt si eu pasionat de lumea acvaristicii, dar in acelasi timp lucrez si in domeniul IT avand si ca pasiuni electronica si radioamatorismul.

Controller pentru acvariu

Pentru cei care sunt interesati va atasez o schema de principiu care functioneaza la mine in prezent care a fost modificata de mai multe ori pana s-a ajuns la o forma optima. Ideea este sa poata masura temperatura PH-ul si concentratia sarurilor din apa, apoi funtie de ora sa aprinda si sa stinga lumina sa alimenteze cu hrana pestii iar in momentull hranirii pompa de apa sa se opreasca 10 min pentru a nu creea curenti si sa imprastie mancarea respectiv sa o absoarba. Toate datele sunt afisate pe un display LCD 2x16 caractere si acum lucrez la interfatarea cu un calculator pe rs232. Petntru cei pasionati si cu cunostinte de programare nu va fi o problema majora punerea in functiune precizez ca eu am folosit limbajul c++ si sa potrivit de minune. A tiny and accurate pH-meter: from schematic to calibration. This tiny pH-meter is very tiny: 11cm2 including the PSU circuit!

A tiny and accurate pH-meter: from schematic to calibration

I built it for the College Saint Pierre a few years ago. It is based on a circuit developped at the Facultes Notre-Dame de la Paix, Namur, Belgium. I modified several components to allow a smaller power supply (+/-5V instead of +/-12V) which could be used to power the display unit. I also spent 'some time' fitting everything on a very small PCB, just for the fun of it (and also because PCBs are sold per cm2 of surface). At this time about 30 have been built and used for several years during college classes, demonstrating their reliability.

Juste because it's damn small does not mean that you have to settle down for second best when it comes to performance. Schematic The schematic is shown below. The circuit input is pin 15 of K1. Once the signal has been amplified it enters an offset circuit built around IC2. Note that both P1 and P2 are on the front panel, not on the PCB. Components Construction Photos. CreativeCOW. pH Measurement & Control Circuit - Intro and Getting Started. DIY CO2 Fertilization in Aquarium Tanks - Jim Hurley. Jim Hurley (hurleyj-at-arachnut.org), July 20 1993 [Editor's note: Here are some comments by others who've built controllers based on this design.]

DIY CO2 Fertilization in Aquarium Tanks - Jim Hurley

A posting I made. I have a scanned GIF file of the schematics for this project here. I started fishkeeping a little over 3 years ago and didn't know very much. I bought some books, followed the Internet aquaria newsgroups and made some friends with knowledgeable fish-folk. So one weekend I bought the pH probe from a local scientific supply house along with some calibration pH buffers and cleaning solutions.

I had forgotten all the high school chemistry I ever knew and I am basically self-taught in electronics, but what the heck, I'm ambitious. I looked in the Yellow Pages for some Welding Gas suppliers and found one nearby who sold tanks of CO2. I also bought the tank regulator at that place. I next looked through the Yellow Pages for metal plumbing fitting suppliers and found a local supplier who was very helpful. So now I had this idea. OZ REEF - DIY Plans. How-to: USB remote control receiver. Implementation USB into microcontroller.

Purpose of this article is to inform readers about implementation USB interface into singlechip microcontroller, which this interface directly not supports.

Implementation USB into microcontroller

Simply: implementation USB interface on firmware level (similar as emulation of RS232 interface in microcontrollers, which not have RS232 support). This project includes development of firmware on microcontroller side, driver development on computer side (for Windows operating system) , development of DLL library for functions calling from another programs (programmers level) and development of demo program (users level), which shows all functions of this device. Device is named IgorPlug-USB (AVR) (as successor of my previous device for computer remote control IgorPlug - serial port version). Introduction: At present time is USB interface very popular especially within end user. Construction: My solution offer very simple and cheap hardware (cca 3,-US$). Automation Software - Downloads.