« first day (14 days earlier)      last day (48 days later) » 

tlfong01
tlfong01
2:21 AM
I am casually googling around to see what other experts talking about nRF24. I noticed one expert saying that "... it is not easy to tune the signal strength ...". I was wondering that should I set the transmitting power to maximum to ensure max reception? Reference: (1) [Cheap COTS (Commercial Off The Self) transceivers that work with Raspberry Pi? - Asked 2015 Viewed 924 times]:
https://raspberrypi.stackexchange.com/questions/15908/cheap-cots-transceivers-that-work-with-raspberry-pi.
I also noticed that the nRF24 module is a 5+ year old product, and so should be mature and reliable, worth spending time on it (though the library is not perfect, and no longer supported by the original developer, but then it is more challenging than using a BettyFruit library and everything goes smoothly, spoiling you too lazy to learn.
 
 
7 hours later…
tlfong01
tlfong01
9:26 AM
I am testing two nrf24 modules at the same time, using the following /boot/config.txt, with 2 SPI buses and 5 Chip Selects. The following record is for your reference, in case you wish to use later. Cheers.
 
 
3 hours later…
tlfong01
tlfong01
12:00 PM
Now I am testing the SPI two and three bytes loopback functions, which are used later to read and write nRF24 registers. You can search this forum using keywords "SPI", "loopback" for newbie friendly Rpi3+ stretch test programs for both SPI1 and SPI2. I am using Rpi4B buster version now. I am using low SPI frequency of 100kHz, so I can use long wiring. Later I might increase to 1MHz. The is the waveform capture: imgur.com/gallery/aFVfLg2.
 
tlfong01
tlfong01
12:19 PM
 
 
4 hours later…
StevenCellist
StevenCellist
4:14 PM
Of what I know, the signal strength shouldn't be set to max when the radios are close to each other. The signal can be too strong, and minimum power should be able to work perfectly fine
 

« first day (14 days earlier)      last day (48 days later) »