AquaticTechTank.net

So I'm moving on to the RPi from this previous , project for the Arduino.
I was running into a brink wall with turning the arduino into a responsive web server. The RPi lacks PWM (except 1) and analog input so adding multiple components are needed.

I then found a project where the arduino is used in conjunction with the RPi.
http://ni-c.github.io/heimcontrol.js/

It does pretty much I want with original arduino project. I'm installing it now on my RPi but 4gB of SD card space isn't enough. I'm ordering a 16gB card now but I think a 8gB card would be sufficient.
I might need to mod it to do what I want in the end but we'll see.

Actually you can output pwm on multiple GPIO pins on the Pi - see the "pi blaster" project:
https://github.com/sarfata/pi-blaster/

Don

I started installing software onto the PI. Mongo database took 8 hours! And when I can home to initialize the mongo build, it failed.
will have to find what's wrong. This can be tedious.

I got heimcontrol.js server up and running. There were issues with it starting up but you have to upload the sketch into the arduino and then connect the arduino to the pi to have the server run correctly.

So, it's basically a remote control lacking time control and dependencies on other devices like sensors, like if I need a relay to turn off when a temperature sensor hits 90F. I'll try to mod the existing heimcontrol code or start fresh. We'll see.

I am also trying to make controller for my aquarium. I wanted to use just RPi to keep it simple and control everything with it. I don't have a lot of programming experience so it will be a steep learning curve if i could get it done. I am following your thread now and some on TPT as well. Looking forward to see your progress.

I'm using a Pi to control a 75 gal planted Discus tank.
see viewtopic.php?f=35&t=152

I'm using Apache and PHP for the web pages, and C++ for the control algorithm.

If you are interested let me know and I'll try to find time to post an update - i've been tinkering with it and have made some additional progress... of course, there's always more to try/do. e.g. I got the Pi's HD camera module but need to get an extension cable so it can take pictures of more than just the inside of the cabinet under the tank .

Don

some screenshots
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File comment: chart parameters

chart1.tiff [ 150.99 KiB | Viewed 7937 times ]
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File comment: chart - temperature, nitrate filter flow, nitrate filter ORP

chart2.tiff [ 185.35 KiB | Viewed 7937 times ]
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File comment: allows you to change control parameters - loop times, setpoints, etc

control.tiff [ 205.6 KiB | Viewed 7937 times ]