CO2 doser and things out of my league - The Planted Tank Forum
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post #1 of 2 (permalink) Old 01-11-2018, 09:34 PM Thread Starter
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CO2 doser and things out of my league

In the real world they sell a "carbon doser" based primarily on a 555 timing chip and a Clippard mouse solenoid.
Like the concept and Theatrus has attempted (probably succeeded but proj appears dormant) to duplicate it here:
Micro solenoids for CO2 regulators - Reef Central Online Community

It dawned on me that using PWM and a MOSFET seems a somewhat similar concept but not the same...
Being mostly electronic basics idiot.. that may, in effect be what the 555 chip does but looking for alternates to skin a catfish..

Basic concept would be to control the PWM "duration" as usual. (bubble size)
Change the PWM dwell (on time) using a change in frequency. (bps)
All fed to a MOSFET to run a Clippard.
Advantage is w/ the right chip I believe one could eliminate the MOSFET
The above chip could output up to a 6w coil (?) giving one a one chip board..

excuse the ignorance of this but a Thurs thought

Addendum: Looking at the output waveforms.. seems one could "log" the output.. i.e like a slow ramp up in CO2.. ramp down..

does any of this make sense to anyone?

"A man with a watch knows what time it is. A man with two watches is never sure"

Last edited by jeffkrol; 01-11-2018 at 09:52 PM. Reason: edit
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post #2 of 2 (permalink) Old 01-12-2018, 12:36 AM
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Originally Posted by jeffkrol View Post
does any of this make sense to anyone?
Control valves @ my work are operated in similar fashion, high PSI(540) to control a blow-off operation.
All coils require correct polarity on this equipment though!
Specialized valves from MAC & Festo in facility.

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