Do you have devices for your inputs like CO2 sensor.
They are having some issues with their input conversions right now if that is what your issue is.
I wrote a conversion function that works pretty good.
10 REM RETURNS Y INTERCEPT BASED ON XVALUE
20 REM FIT: Y = MX + B ----------------------------------------------------
30 “Your variable” = ( 2000 - 0 ) / ( 20 - 4 ) * ( “Your Input” - 4 ) + 0
40 IF “Your Input” <= 4 THEN “Your Variable” = 0
50 IF " Your Input" >= 20 THEN Your Variable" = 2000
This is for a 4-20 CO2 Sensor with a 0-2000 range. Jjust swap the 4 and 20 for 0-10 or 2-10 depending on your sensor.
Jim, I’m at Rosedale Technical College in Pittsburgh. 215 Beecham Drive Pittsburgh PA 15205. I’d really appreciate some controls stuff I could use for my controls class. It would help so much. I’d like to pay shipping.
What do you need?
A Co2 sensor, a couple of 10k thermistors, outdoor temp/humidity sensor, current switch, couple of 24vac relay and relay bases, 0-10vdc damper actuator with feedback, duct pressure sensor,0-10vdc valve actuator with feedback, room temp sensor? a couple of bacnet thermostats (viconics) you can try when maurice gets the bacnet subnet working. Ill see if I have a 24vdc power supply for some 4-20 sensors but not too likely. Anything else?
Jim, yes, some room temp/sliders, co2 and humidity stuff would really help, and anything you send will go to good use… It is really swell of you to help a non profit HVAC school. If you give me your paypal I’d like to pay shipping.
As ioware.io suggested, you can load the 2heat/2cool program as a starting point. There may be some shuffling of the IO around required since it was programmed on a Tstat10.
There’s no easy way to move IO around other than renaming them. You can save a bit of time with the programing though, before doing any renaming of IO you can save the program as a .txt file first. After you have shuffled the around by renaming them you reload the original .txt file back into the control basic editor and send to the controller.
Here’s our first crack at the demo board. I will get a sample off to you for some closeup feedback. I know we need more space for some labels & graphics. Maybe a stand of some sort.
When you have something to share on the lesson document that goes with this I have a friend in Korea who is keen to get started.
Step one of any project to enter a name and range for each of the sensors wired into the system. Give each input a long 20 char name at Tab1 and a short name used for the programming at Tab2. Then set the range for each of the sensors. Since this project uses pots to simulate the readings, and your pots are probably different that what we used here you will need to tweak the range using custom tables. You can read how to do that here:
I haven’t figured out which potentiometer to use with 10v to do 0-10v input yet but to simulate 10k thermistor, a 100k pot in series with 5k resistor works perfect for a range somewhere around 0-100degF
Here are 2 videos I made at school with the T3000 Demo. I can use everyone’s feedback so I can get better at programming and my projects can get more elaborate. The idea of these projects is for students to start simple and learn the inputs and outputs as well as basic programming.
