Hi.. I'm posting here get advice (help) on how to proceed in low budget and efficient way to build a Wireless multi sensor Humidity & Temperature system.
My requirements are: - Low cost - Wireless system (no cables). - Sensors (battery powered ,~AA batts)
Something like this :
i have put the dth11 sensor because i already used one in the past with good results and cheap but not mandatory For the receiver i will use arduino uno with an LCD and usb connection the pc .
Main questions and worries:
What will i use for wireless ?
Options : *1- NRF24L01 2.4GHz Wireless Transceiver Module * What i like: - I read that i can use it on 6 members network - some libraries available. - Bidirectional
Don't like: Will this mess with 2.4ghz wifi network ?
2 RF Link Transmitter - 434MHz (laipac). What i like: - some libraries available (virtual wire) - Price
Don't like: Don't know if i can do a network with this
My first approach for remote sensor:
- Arduino mini pro
- RF Link Transmitter - 434MHz
- DTH11 sensor
- 4 AA batts 4.8v
i will read the dth11 info and send it to the receiver identifying the sensor something like a string "SzTxx.xxHyy" S=Sensor id T= temp H=hum
And i will send this information 5 in 5 minutes..
The receiver will be
- Arduino uno
- RF Link receiver - 434MHz (virtual wire)
I will be listening to radio and when a message arrives i will check the sensor who send it and then print to the serial console and to the lcd...
[u]makes sense ?[/u]
will these communication work ? how to reduce the sensor costs/equipment ? i don't need intelligence on the sensors some dumb wireless that has an ADC or way to read temp/hum sensor and pass the raw values to the receiver will be ok...
this will split in 3 floors :
floor 0 2 sensors
the distance will be lets say 20meters maximum between sensor module and receiver.
I would like to keep the sensors at 10€ but i'm already off
Arduino Pro Mini 168 - 5V/16MHz - 10€ Dth11 Sensor - 2€ Rf Link pair - 4€ batts 5€
So i'm at least a ~20€ per sensor.. i would need 5 making 100€...
Suggestions, new ideas, comments please (before i start to waste money ;)..