Reef-pi computer and settings

[carbondave]

Hey all, I recently came across the reef pi controller and am super interested in it, particularly the robo tank implementation (mostly so I don't have to learn how to build electrical circuits/solder, buy all of the tools, etc.) One question I have is which model Raspberry Pi to get. General consensus seems to be either zero or 3 B+. Given the low price point of each I may be overthinking things, but I'm curious to hear others' experience with each, in particular understanding what equipment you have hooked up, sampling frequency, and performance. To start I'm planning to have the following sensors and sampling intervals, although I'm sure I will add devices over time:
Temp probe: 1s
Optical level sensor: 1s
pH: 60s

Would appreciate any insight you all have into these frequencies and the performance of the Raspberry Pi computers.
@Ranjib
@robsworld78

 

[nuxx]

Seems fun, wish they were around when I had my tank.

The Apex was great, and I'd probably try a smaller less critical tank with the Pi...

Did mess around with a Pi building a monitor for the cooler at our brewpub...

 

[ColoredRock]

I use a RP 4 ( I all ready had it) with Rob's hat (RoboTank) monitors temp and pH I also use it to control non critical things like the ability to turn off my skimmer, ATO, flow pumps and return for when I do maintenance with a simple macro using Rob's power AC power-bar.

I also use the sensors as a backup.. ie I have a temp controller plugged into the power bar.. so the ref-pi backs up the temp controller which backs up the heater.

The ATO is plugged into it as well and the water level sensor backs up my ato sensor.

I dont have any experience with the other pi's so i will let others chime in.

 

[carbondave]

Thanks for the feedback so far. Would love to hear from others about their experience.

 

[ColoredRock]

You can look thru .. this and find peoples "builds"

reef-pi

www.reef2reef.com

 

[Someshmuk]

I've been looking into it as well, whitebox makes a 5 port ezo circuitboard with 2 isolated circuits and 2 ports for standalone isolated ezo circuits. From what i've seen, the ezo circuits are highly sensitive and will give inaccurate results if handled improperly.