HVAC board

[mikeym]

Just hooked up the new HVAC board to a Senscomp ultrasonic sensor. The HVAC board is outputting a reading that is only about 10% of the input voltage. I also hooked up a bench power supply and right now I'm inputting 3.0 volts and it's reading .25 volts on all 4 channels. Anyone have any suggestions. This is a brand new board that I just received.

Thanks

MikeyM

 

[sda]

That's correct. Search the forum for details, but in summary ... The HVAC monitor board does not indicate the actual voltage, it only indicates if the heat/cool/fan is "on" or "off". The 24vac is massaged so it falls within the range of the DS2450 chip, which ends up being about 10% of the original voltage. Just check for >2v and you'll be fine.

 

[mikeym]

OK, thanks. Well that makes it pretty useless for my application. I needed something that would read an analog voltage. Guess it's back to Plan A or Plan C. I think I have a solar sensor laying around someplace and I know I can use the Vad input on that to measure the voltage output of the sensor.

Thanks for the info and Merry Christmas

MikeyM

 

[mikeym]

OK, got it. I went directly to on of the A/D inputs on the DS2450 and it's working fine. Thanks again for the info on how the board works.





MikeyM

 

[mikeym]

Also Eric advised me that he would replace the board with a modified board to measure the A/D voltage. GREAT CUSTOMER SUPPORT !!

MikeyM

 

[weylan]

I have ordered the HVAC and I ordered the box, but only got the hvac unit. How do I get the box it goes in that was not shipped?

I also saw on the forum that you might have some DOCS that were not on the website?

Do you have those docs?

This is exactly what I want to do. I also saw that there was a way to get it to read from 0-28V. did you have a modification that can be done, or how do I get that modification?

Also Eric advised me that he would replace the board with a modified board to measure the A/D voltage. GREAT CUSTOMER SUPPORT !!

MikeyM

 

[ericvic]

I have ordered the HVAC and I ordered the box, but only got the hvac unit. How do I get the box it goes in that was not shipped?

Did you get the email I sent directly to you.

Eric

 

[weylan]

I got this working using the formula (Vi *10) +2 Seems to get me a 12-15V reading that seems to be matching what I need. Thanks all for you help.

I do have some strange readings though. For no apparent reason I seem to have voltage spike readings of 54V and dip readings of 7V. any idea. I am sure these are bogus readings. But don't know where to go looking next.

Is it a change I might need to make to the 1-wire network? Suggestions?

 

[smalenfant]

I'm having similar issues here... I know my AC is "ON". I turned it down to 65F for testing. I get random reading when the AC/Fan are ON, but the reading are fine when they are off.

A is the FAN
B is the AC

I have a script that goes over and over again :
HVAC Monitor : 20.D12806000000
DS2450 Volt1 A=1.3440724 B=1.5039178
DS2450 Volt2 A=1.1822725 B=0.97473

DS2450 Volt1 A=35.56058 B=9.393956
DS2450 Volt2 A=0.75 B=0.75

DS2450 Volt1 A=1.3105565 B=1.7789222
DS2450 Volt2 A=1.1225447 B=9.285868

DS2450 Volt1 A=5.109049 B=1.5082155
DS2450 Volt2 A=26.99182 B=13.54839

DS2450 Volt1 A=5.587736 B=1.2890713
DS2450 Volt2 A=1.1418805 B=1.2179367

DS2450 Volt1 A=1.4257144 B=35.41285
DS2450 Volt2 A=13.39076 B=17.11921

DS2450 Volt1 A=21.49763 B=1.198835
DS2450 Volt2 A=1.2080543 B=1.0757078

DS2450 Volt1 A=1.2521179 B=32.16598
DS2450 Volt2 A=21.81148 B=0.75

DS2450 Volt1 A=24.44871 B=1.3174315
DS2450 Volt2 A=13.57248 B=1.240281

DS2450 Volt1 A=1.2005543 B=21.20536
DS2450 Volt2 A=1.0997714 B=0.75


If I use a multi-meter, I'm getting the right 24V reading.

I use (11 * reading) + 0.750.