19-06-2015, 20:11
Hi Alan
The JT118 question, is about the transmitter module used on the WeatherDuino Pro2 TX units. Actually it is a FS1000A, as the one in the first link.
The TC units have an hardware circuit controled by the software, that turns OFF the power from the TX module, when there is nothing to send, this preserves power but also avoids the contant presence of the carrier.
The RX microcontroller only checks for a valid datapacket one time in the main loop, but it's true that some cares have been taken with the execution time of each routine in the main loop.
Despite using cheap radio modules, you can believe that the RF link is one of the strong points of the WeatherDuino Pro2 system. A lot more reliable than the majority of other weather stations. In 3 years I never get currupted data.
You are absolutely right. The receivers used on the WeatherDuino Pro2 system (RX and WD units) are superheterodyne type.
The receiver on the second link posted by JT118, is also a "SuperHet"
and if not equal is very similar to the RXB6 module, recomended for the WeatherDuino Pro2 system.
Here is another link for one of those modules:
http://www.ebay.com/itm/Pro-433Mhz-Super...20f8688a96
The TX module is this bundle can be used on the RX v4.0x board to allow the data relay function.
The JT118 question, is about the transmitter module used on the WeatherDuino Pro2 TX units. Actually it is a FS1000A, as the one in the first link.
(19-06-2015, 16:49)AllyCat Wrote: SuperRegens generally have much lower range, but their main problem is that they output "garbage" (noise) when there is no signal being transmitted. That means the microntroller has to spend much of its time checking if there is a "real" signal or just garbage (when there may be proper "work" to be done).
The TC units have an hardware circuit controled by the software, that turns OFF the power from the TX module, when there is nothing to send, this preserves power but also avoids the contant presence of the carrier.
The RX microcontroller only checks for a valid datapacket one time in the main loop, but it's true that some cares have been taken with the execution time of each routine in the main loop.
Despite using cheap radio modules, you can believe that the RF link is one of the strong points of the WeatherDuino Pro2 system. A lot more reliable than the majority of other weather stations. In 3 years I never get currupted data.
(19-06-2015, 16:49)AllyCat Wrote: A good type of radio receiver to look for is called a "SuperHet." (superheterodyne) which your third link mentions. The simple, low-cost type to avoid is called a "SuperRegen." (superregenerative) like your first link (but I don't think the listing actually mentions it).
You are absolutely right. The receivers used on the WeatherDuino Pro2 system (RX and WD units) are superheterodyne type.
The receiver on the second link posted by JT118, is also a "SuperHet"
and if not equal is very similar to the RXB6 module, recomended for the WeatherDuino Pro2 system.
Here is another link for one of those modules:
http://www.ebay.com/itm/Pro-433Mhz-Super...20f8688a96
The TX module is this bundle can be used on the RX v4.0x board to allow the data relay function.