Sensors local to Pi?

Question/suggestion:

Could sensors be attached directly to the Pi's gpio interface but be treated by EasyIot the same as any other remote sensor?

This would allow, for example, barrometric pressure sensor (e.g. BMP085) to be attached directly to the Pi instead of a remote Arduino-based sensor. This would help to maximise the battery life of the remote sensors. Pressure would be the same at both the location of the Pi and the remote sensor.

Paul

PaulRB wrote: Question/suggestion:

Could sensors be attached directly to the Pi's gpio interface but be treated by EasyIot the same as any other remote sensor?
Paul

That's a good idea and I like it!

PaulRB wrote: Pressure would be the same at both the location of the Pi and the remote sensor.

Paul

I am not so sure of this as the BMP180 (and BMP085) both need the current temperatue to figure out the air pressure. A sensor indoors will be inaccurate compared to one outdoors (unless the temperatures at both the pi and remote are identical).

Skywatch..

Temperature is needed to compensate pressure. So it doesn't matter if the sensor is outside or inside. It will show the same pressure. Can be used in a temperature range from -40 to 85 (Celsius). Google for the datasheet.

HarryDutch wrote: Temperature is needed to compensate pressure. So it doesn't matter if the sensor is outside or inside. It will show the same pressure. Can be used in a temperature range from -40 to 85 (Celsius). Google for the datasheet.

Absolutely right. The temperature reading is uses to calibrate the pressure reading. the BMP sensors are pretty neat because of how they work. The tutorials kind of hint at what you can do, but they always use a constant for the altitude. I have written Arduino code based on the SFE library that takes are reading, computes the current altitude and then outputs a compensated barometric pressure for weather readings.

It's not totally finished code, but the ides is to be able to build a small portable weather station to take hiking/camping to gives temp, barometric pressure, but can also show current elevation. I wan thinking of adding a button to lock a base altitude, allowing you to compute difference in altitude as you hiked, or add a data logger to see altitude changes.

Before I started playing with Easy-IOT, I had a BMP set up on an indoor Arduino Ethernet to do what the OP is asking. I was planning on porting that code to a board with my indoor humidity sensor, but adding it to GPIO might not be a bad idea (other than figuring out how to code everything in Python)