ATM, I only have the Ethermega, relays, RTC, dosing pumps and DHTs. The Atlas stuff is on my wish list. The dosing pumps cost about as much as the rest combined. I get that the EC and PH circuits and probes can be DIYed, however, this goes well beyond my understanding of circuitry and IMO, I need to leave that depth of involvement to engineers. TBH, I’m surprised I was able to produce a functional 8 channel motor controller in only 3 tries, but those circuits are small in nature, and there is plenty of well documented tutorials on the web to build a typical TIP120 circuit. That aside, I am learning new things everyday in code and in circuitry. I’d definitely like to elevate to that skill level one day, but I’m nowhere near there yet. Also, it will be months before I can begin to invest in any Atlas stuff, so who knows, maybe I’ll advance before then.
As far as the topic of this thread is concerned, I have the dosing pumps part covered in both hardware and code. The only changes that remain to be made are changing constant variable values in the code. I spent roughly $135 to acquire all 8 pumps, and maybe an additional $50 on components and 3 solderable breadboards, (I ruined two of them). But with all things I build from an idea, I always vastly overspend due to not having the best knowledge of what to buy and what not to buy. That said, I think the 8 dosing pumps thing could’ve been built for est $80 excluding power supply. All that’s needed are any 12 volt motor and a peristaltic dosing pump head. These heads merely press onto the motor shaft and the 3 little drums in each pump simply press against the motor shaft so the pump is passively driven by the motor. The Peristaltic Heads are only $4, and last I checked 12 volt motors are relatively cheap. Have you begun building your doser, or are you still doing research?