WeatherDuino Forum

Good evening,

To excuse, if my question is stupid…

On the PCB, I see a site (place) for a module TX-RF.
Does this PCB work directly with a RX+?
Does this PCB work only with one TX?
This PCB can work with a RX+ or a TX (with the choice).

I hope that you understand what I want to say.

Thank you, good weekend

(25-08-2017, 19:31)tobyportugal Wrote: [ -> ]Good evening,

To excuse, if my question is stupid…

On the PCB, I see a site (place) for a module TX-RF.

There are no silly questions 

The AQI is designed so that it can simply work by itself and not send data anywhere other than its LCD screen.
It can be setup to display on the LCD if one wants to, and transmit data to a Rx2 Plus receiver; and into the future.
With transmission there is no need for LCD, but is a personal choice.

From testing versions, the transmitter was setup to work alongside Tx 1, so set to the same ID as Tx 1 in the receiver. The AQI is a physical transmitter in its own right.
If this is different now, Werk or another of the development and testing team will correct 

Hope this helps in the meantime.

(25-08-2017, 21:32)qldbureau Wrote: [ -> ]With transmission there is no need for LCD, but is a personal choice.

From testing versions, the transmitter was setup to work alongside Tx 1, so set to the same ID as Tx 1 in the receiver. The AQI is a physical transmitter in its own right.
If this is different now, Werk or another of the development and testing team will correct 

Hope this helps in the meantime.

Hello,

Thank you for your explanations.
I have just seen the PARTS LIST, maintaining it is clearer.

Good weekend

Hello everyone,

Here a very complete link on the sensor CO2 MH-Z19
https://revspace.nl/MHZ19

Excel Sunday.

PS: Sorry… I am a chatterer

Good evening,

It is still me...  with my questions ...   
I do not understand the utility very well to put on the PCB a temperature gauge.

With a sensor like this: 


[Image: Industrial-High-Precision-Si7021-Humidit...rduino.jpg]

This sensor assembled on the PCB in a case (box) goes given measurements rather unreal (overheating, excess or lack of moisture)
On the weather level, it is not very representative.

1/ Why one does this sensor mount?
2/ Is it used to compensate measurements AQI?
3/ Are these t°/HUM measurements transmitted to the RX+?
4/ Is its assembly obligatory?

I am sorry to annoy you, but I like to know what I do and why.
Sorry for my very approximate English.

Thank you, good night.

A got a couple of questions to, so thanks Toby for starting this thread
I take it it the AQM can display the data on the LCD as well as transmit it to the RX unit simultaneously ?
Does the unit have to be located out in the open in free space?
What is the current required to run this? Could it be powered off an existing RX unit?

Toby and uncle_bob, I will try to answer to both at the same time.

The dust sensor, no mater if it the PMS7003 or the Sharp should be installed outside the house, in a well ventilated place, far from some "human influences". These sensors are so sensitive, that if you are just smoking a cigar at some meters from them, the readings can go very high quickly.

I believe that the Zdeneck assembling can be one of the best possible solutions. Everything installed inside a structure similar to a radiation shield. This approach also have the advantage of providing good conditions for the Temperature / Humidity sensor.

[Image: DSC_7444-upr-sm.jpg]

Why does we need a Temp / Hum sensor in the Air Quality Monitor?
- It is a requirement to everyone that eventually will want to use the Sharp sensor, as it needs to know the relative air moisture to make compensation for high humidity conditions (above 50%). The specifications of the PMS7003 don't refer the need to do any compensation in function of the air moisture, however, if in the future, we discover that doing some kind of compensation, will improve the readings, we already have the hardware for it.

Are these t°/HUM measurements transmitted to the RX+?
- Yes, the readings from the sensor are also transmitted to the RX unit, acting like a Davis extra sensor. By default its mapped to extra sensor 6. So, we get an extra sensor for free.

Could we dispense the use of the Temperature / Humidity sensor?
- No.

Can the AQM display the data on the LCD as well as transmit it to the RX unit simultaneously?
- Yes it can. However the usefulness of the LCD will be most for the cases where someone want to use the AQM as a stand alone unit, per example to monitor the air quality in their workplace, etc. For this cases the installation could be made in a small plastic case, with some large venting holes.
For those who also intend to use the CO2 sensor, it should be installed avoiding direct sunlight. One more time, a structure similar to a radiation shield will be perfect to house both the PMS7003 and the CO2 sensor, as also the Temp / Hum sensor.

What are the power requirements?
- It depends on the building options and on the dust sensor used (due to the included powerful fan, the Sharp needs a lot of power). A standard 9V 1A power supply, covers all the possibilities.
Please note, that during most of the time the consumption of the AQM is less than 70mA, slightly increases each 37 seconds for less than a second during signal transmition, and also when reading the sensors, which happens only at each 15 minutes. So, the overall power consumption of the AQM is very low, but iT should be available for when the system needs it.
In the future we can even improve the power consumption, by put the Arduino Nano in sleep mode during the idle time.

Hello,

Thank you for the very useful information.
In my reasoning, I often refer to my experiment in electricity/electronic car (it is my trade).
Thus… do not fall from your chair.

I think of making an off-set assembly of the sensor, with this for example:




I put myself the question length of the cables.
For SHTxx, I believe that one can have +/- 1m wire without problem.
For the PMS7003/MH-Z19, I did not find information. With is your opinion 1 m of wire good?

Good afternoon

(28-08-2017, 23:28)Werk_AG Wrote: [ -> ]The dust sensor, no mater if it the PMS7003 or the Sharp should be installed outside the house, in a well ventilated place, far from some "human influences". These sensors are so sensitive, that if you are just smoking a cigar at some meters from them, the readings can go very high quickly.

 
Outside no cigar: 



Inside +cigar:

Hello Werk_AG,

I need some infomations about parts not mentioned in your part list :

1. C1 and R1 also the fan control D1, R2 and T1 are only needed if you use a Sharp sensor.
2. R12 (value 0R on the shematics 5K?), C4, C5 and IC3 for AREF.

Pierrelux