sx127x 20dBm support 2 #153
Conversation
|
This is working pretty good. I've checked it with this power meter: power setting 17 = 36mW (50mW) It is a bit lower than theory (in parentheses) because the tx pulse is so short. When would this be merged to the master? @sandeepmistry |
src/LoRa.h
Outdated
| @@ -54,6 +54,8 @@ class LoRaClass : public Stream { | |||
| void setSyncWord(int sw); | |||
| void enableCrc(); | |||
| void disableCrc(); | |||
| // Over Current Protection control (Semtech SX1276/77/78/79 5.4.4.) | |||
| void setOCP_sx127x(uint8_t mA); | |||
There was a problem hiding this comment.
I don't think this needs to be a public API anymore. Maybe the name can also be changed to setOCP as well?
There was a problem hiding this comment.
No problem!
If your library doesn't support another chips it's not needed.
As I preferred commented code, I think to save comment is better.
There was a problem hiding this comment.
Only supports Semtech SX1276/77/78/79 as per the read me.
There was a problem hiding this comment.
uh.. i don't read read.me. wait a minute, I'll correct pull request.
|
API.md also needs to be updated accordingly for the new supported values. |
|
Check, please =) |
|
@dontsovcmc what is command for get the value? |
|
who needs to get over current protection value?! =) |
minor code styling
properly map TX power levels 18 and 19
|
Note that Semtech specifies a maximum duty cycle of 1% at +20dBm. |
|
After speaking with Semtech they seem to think that as long as local regulations have no issue with your duty cycle, transmitting long duration payloads at +20dBm will be fine. This is obviously some mixed information. I asked if I can send 30 second long payloads at +20dBm and they said that will be fine. Which leads to the question, duty cycle relative to what? 1% of the year? 1% of an hour? |
|
I am a little surprised if regulatory limits made it into the physical limits part of the Semtech datasheet, but I can understand it happening. If 30 seconds transmit is OK at +20dBm, that's 1% of 5 minutes. I don't recall off the top of my head what the Part 15 conditions are for 1% but I believe this is well within the legal limits. Thank you for following-up with Semtech. |
|
Regulatory limits in a Datasheet is certainly odd to me, in my country, at 900MHz there is no Duty Cycle requirement provided that the signal is Digitally Modulated. So the note about 1% really does not apply to me; unless it is for power dissipation concerns, such as transmitting continuously in high ambient temperature? I didn't get any more information from Semtech other than them saying that 30 second transmissions at +20dBm should not damage the device. So that's what I'll do :) |
#79 (comment)
check current with BSFrance Lora 32u4 (HPD13) modules:
17 dBm - 59 mA
20 dBm - 80 mA