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dparson55 / NRFLite

nRF24L01+ library with AVR 2 pin support, requiring very little code along with YouTube videos showing all available features.
MIT License
161 stars 27 forks source link

How to set the Output power? #80

Closed vkvark closed 2 years ago

vkvark commented 2 years ago

Hi,

I'm aware that the library will always set the output power to the maximum (0 dBm) level. This is not always convenient. For example, in my project the module will be located on a headband, so I'd like to set the output power to -12 dBm to avoid negative impact on health caused by the 2.4G radiation. Can you please add an output power setting to the library?

dparson55 commented 2 years ago

Please see #12 for why the output power isn't exposed and how the library controls it. If you'd still like to use this library instead of a more full featured library then you can just edit your local copy and change the RF_SETUP register.

https://www.sparkfun.com/datasheets/Components/SMD/nRF24L01Pluss_Preliminary_Product_Specification_v1_0.pdf image

vkvark commented 2 years ago

Well, I guess one additional setting wouldn't make the library too complex. Anyway, thanks for the clarification.

richardHnewmark commented 1 year ago

Hi, I'm using two 1.2V AA batteries to power a 3.3V Arduino Pro / NRF24l01 (with step-up converter to get 3.3V) and 1 in 6 transmissions fail. Powering the setup directly from the computer I get 100% successful transmissions. So I'm guessing that the default max power from the NRF24l01 is exceeding the current output capabilities of the step-up converter. I'm really keen on powering the NRF24l01/Arduino on just two rechargeable AA batteries, and thought I could try reducing the transmission power of the NRF24l01 to see if that makes a difference.... so could I add my voice to a function that does this! At the moment I'm too much of a novice to "edit your local copy and change the RF_SETUP register." But thanks for a great library... I too am an advocate of simplicity..!

vkvark commented 1 year ago

Hi, I'm using two 1.2V AA batteries to power a 3.3V Arduino Pro / NRF24l01 (with step-up converter to get 3.3V) and 1 in 6 transmissions fail. Powering the setup directly from the computer I get 100% successful transmissions. So I'm guessing that the default max power from the NRF24l01 is exceeding the current output capabilities of the step-up converter. I'm really keen on powering the NRF24l01/Arduino on just two rechargeable AA batteries, and thought I could try reducing the transmission power of the NRF24l01 to see if that makes a difference.... so could I add my voice to a function that does this! At the moment I'm too much of a novice to "edit your local copy and change the RF_SETUP register." But thanks for a great library... I too am an advocate of simplicity..!

Which step-up converter are you using? Did you try to add an additional capacitor to the converter's output?

richardHnewmark commented 1 year ago

https://www.ebay.co.uk/itm/253164825504 is the step-up converter I'm using. I have a 10uF capacitor across the grd/Vcc of the nrf24l01, but that didn't make any improvement.

vkvark commented 1 year ago

Try a 33 to 47 uF ceramic capacitor.

richardHnewmark commented 1 year ago

500 transmissions at 5 sec intervals, only 1 failure. Excellent. I used a 470uF capacitor, as that was the closest I had. One happy customer. So nothing to do with transmitter power levels. Thanks!! Richard