Solved the problem. (doh). I needed to change the sub-band for 915Mhz operation to sub-band 2, which turned out to be a single change. Was a good learning exercise.
I’m looking at how to minimise the bom as best i can now, and it seems to me that i should be able to remove the filter components in the 868Mhz path… ( see rthe highlighted parts for removal )
The 915Mhz path is what is connected to port J1, so i was’tn planning on taking it out… The 868 port is whats on the side i marked off to remove. The RF switch chooses which side…
for regions with +14dBm max output power (868…), the PA_BOOST path is not needed.
for regions with +20dBm max output power (915…), the RFO path is not needed (but it is recommended because it is very efficient in low power transmissions).
in both cases you can save some bom cost removing pasives and changing SP3T to SPDT.
I added all the project files to my Github (TinyLoRa). Please feel free to check it out. I’d really appreciate any feedback you guys can give on bugs and future improvements.
Once you move past the basic examples ( which work quite well ) unorutanty things get pretty rough pretty quickly… The ASF wizard for the R34 is very incomplete. For example i’m just doing some work with generating some PWM. Its just not there. The workaround is to use some L21 code, but then you have to give up on ASF…
I’ve project code for LoRaMac-node and SAMR34 with Keil. But need found it from previous year. I’ll add to my github if found. If TinyLora owner can connect it via debugger to computer - i can debug over internet.
What type of plans / use cases do you have for this platform ? Your choice of feather form factor is a great selection.
One item you might consider is to allow controlling the power to the RF switch in the design.
today you have it directly connected to VDDA ( like the Microchip eval board ) but this RF switch will draw between 5 and 7 microamps by itself when the SAMR34 is in any of the deep sleep modes, so it is the controlling factor for ultra low power vs the modes of the SAMR34.
Since your breakout/feather board will also add extra currents, maybe this is not a problem for you. Just be aware of this added current. Maybe the power to this device could be carefully controlled by an IO pin.
Depending upon your region, a shield might be required over the module circuitry if it was to go thru regulatory certifications.
Will these be available assembled or semi assembled somewhere ( BGA is hard to handle)
Hi All,
Anybody know Lora alliance certification process for SAMR34 Device. As per my understanding we need to do certification for loraWAN stack. Please correct me if I am wrong here. What will be the Lora Alliance certification process for SAMR34 module (custom module)?