inglewoodpete
Senior Member
Some members may have seen my comments and questions in the recent rfout and rfin thread.
While I am happy with the cheap ASK modules with rfout and NKM2401 for receiving (especially the >95% reliability with superhet receivers), for my purpose the loose wire 1/4 wave antennae for both send and receive modules are very untidy. In my search for alternative superhet ASK receivers, I found these HopeRF HM-TR on Futurlec's website. A transceiver with just one antenna: better still, a 'proper' one!
I see that the HopeRF HM-TR modules first appeared 7 or 8 years ago and know that technology moves fast. While not cutting-edge any more, do they still do a reasonable job compared to more modern units?
My project is to a create wireless link between my car and my house to report the locked/unlocked/absent status of the vehicle. The maximum range for the link would be about 20m from inside my house to my car.
The reason being that (very) occasionally, either my wife or I manage to leave the car unlocked in the driveway (we do not have the luxury of a lockable garage). We usually 'get away with it': discovering that we failed to lock the car on the following morning. We don't live in a bad area but a few months ago woke to find some of the doors open and a few items stolen. Fortunately no damage to the car but it cost a couple of hundred dollars to replace my tool kit etc. The wireless link would provide us with peace of mind that we have not left the vehicle unlocked.
While I am happy with the cheap ASK modules with rfout and NKM2401 for receiving (especially the >95% reliability with superhet receivers), for my purpose the loose wire 1/4 wave antennae for both send and receive modules are very untidy. In my search for alternative superhet ASK receivers, I found these HopeRF HM-TR on Futurlec's website. A transceiver with just one antenna: better still, a 'proper' one!
I see that the HopeRF HM-TR modules first appeared 7 or 8 years ago and know that technology moves fast. While not cutting-edge any more, do they still do a reasonable job compared to more modern units?
My project is to a create wireless link between my car and my house to report the locked/unlocked/absent status of the vehicle. The maximum range for the link would be about 20m from inside my house to my car.
The reason being that (very) occasionally, either my wife or I manage to leave the car unlocked in the driveway (we do not have the luxury of a lockable garage). We usually 'get away with it': discovering that we failed to lock the car on the following morning. We don't live in a bad area but a few months ago woke to find some of the doors open and a few items stolen. Fortunately no damage to the car but it cost a couple of hundred dollars to replace my tool kit etc. The wireless link would provide us with peace of mind that we have not left the vehicle unlocked.