💬 Insulated Whole House Fan

[lis610]

In the beginning, I connected the DHT sensor to Pro Mini A0 and separate power supply (5V) and ran DHT Example sketch and eading was "nan". Want to mention that all other wires (FAN setup ) attached to Pro Mini as well. Then I disconnect Pro Mini from setup and connect DHT to it (GND, VCC, and A0) got numbers by running DHT Example. Connect everything together (motor, display, radio) and connect DHT to Pro Mini (GND, VCC, and A0) turn on and got zeros for Temp and Hum. Got frustrated and left for a walk. When I come back, Temp: 85 and Hum 52. I was not patient enough. It takes 5 to 6 min for Temp to show on display. I also tried to connect DHT VCC to the external power supply 3.3 and 5 V, but leave GND connected to Pro Mini and it works.

[lis610]

Finish! Thank you for all your help!


[petewill]

@lis610 Awesome! Congratulations and great job for not giving up. That was a lot to tackle for a first project! Nice enclosure to house everything. Looks way cleaner than mine :)

[lis610]

Can you add additional code; Close the cover if Fan does not start and display error that fan has no power. Thank you.

[lis610]

Display. I used old case from iPod. Sprayed a little red paint and top it with black. Push button at the bottom of the case.

[chisight]

Looks great @lis610 !

[lis610]

I am using RCWL-0516 Microwave Radar Sensor for on/off the display. This sensor is very sensitive. I just want to activate the display in a close range. Any suggestions?

[chisight]

@lis610 said in 💬 Insulated Whole House Fan:

RCWL-0516

https://www.rogerclark.net/investigating-a-rcwl-9196-rcwl-0516-radar-motion-detector-modules/ shows some possible ways to read something other than a digital output of motion at 5 to 7 meters.

It doesn't look like there is a simple way to just make it less sensitive.

[tsjoender]

@lis610 said in 💬 Insulated Whole House Fan:

I am using RCWL-0516 Microwave Radar Sensor for on/off the display. This sensor is very sensitive. I just want to activate the display in a close range. Any suggestions?

You could try the XYC-WB-DC radar sensor. This one allows the sensitivity to be adjusted by changing a resitor value. Here's a Youtube video about it:

https://www.youtube.com/watch?v=41rf6NbuhBs

I'm waiting for mine to come in from China, so no first hand experience yet on how these sensors work.

[hard-shovel]

@lis610 I have found with a 499K resistor the range is reduced to about 1.2m in a ABS box.
With a 1Mohm it was about 3m, I do not have many high value SMD resistors to experiment with but the lower the value the lower the range.

Just tried with a 333K and it operates about 0.8m in free air.