I ordered a couple RFM69HW modules to use for my sensor gateway (433MHz -> MQTT) but selected the wrong version accidentally. I needed 433MHz but bought 915MHz instead. I see on the back that there is a mark indicating the version, so I'm wondering if I can somehow reprogram them to be 433 or if it has a crystal. Everything is so small I can't tell what's what nor would I want to try to change components.
If I need to reorder, I do have one other question. I initially read that the HW version was superior for range. However, recent reading suggests that using the HW is more complicated than using the standard version with an Arduino. I'm going to be linking this to a NodeMCU v3 (ESP-12E) but will be programming via the Arduino IDE. If I have to order new modules, I'd like to make sure I don't make the same mistake again (if HW is a mistake).
It seems that the RFM69HW support both four frequencies, but only one range per hardware subtype :-\
The RFM69HW is a transceiver module capable of operation over a wide frequency range, including the
315,433,868 and 915MHz license-free ISM (Industry Scientific and Medical) frequency bands. All major RF
communication parameters are programmable and most of them can be dynamically set. The RFM69HW offers
the unique advantage of programmable narrow-band and wide- band communication modes.
Technically, you /could/ reprogram them using the right tools, but i'm sure that the matching components for the antenna connection would be incorrect for the new frequency, and RF-performance would be bad.
Based on the suggestion by Whandall, I looked at the library I was planning on using. It looks like there is code to change the frequency, but I don't know if that's all that's needed.
I ordered a couple new ones in 433MHz. It would be nice to have the old ones changed to 433, but it sounds like that might not be possible after reading the documentation from hoperf.
To close this topic out, I spoke to the vendor of my modules and he suggested that there is no way to change them from one frequency to another as there are components onboard that would not be tuned properly (same as what Zapro said). Since I have 2 @ 915MHz, I guess I can play around with communication at that frequency between the two (some day) and just use the 433MHz variant for my current project.
Im trying to capture a 916.8mhz signal from a Honeywell wireless doorbell with an RFM69. Given that the RFM69 listens at 915mhz, would it be possible to capture this?
ilans1:
Im trying to capture a 916.8mhz signal from a Honeywell wireless doorbell with an RFM69. Given that the RFM69 listens at 915mhz, would it be possible to capture this?
No.
And stop hijacking other threads! - it's very bad practice!