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    yd kim

    @yd kim

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    Best posts made by yd kim

    • NRF24L01+PA+LNA distance problem

      Hi All,

      My project has 1 gateway + 5 node with temperature sensor and it is installed in orchard.
      All node is within 20meter from gateway but seems there are a lot of packet loss.
      I bought module from aliexpress which is mysensors link (https://www.aliexpress.com/item/1sets-Special-promotions-1100-meter-long-distance-NRF24L01-PA-LNA-wireless-modules-with-antenna/32341792715.html)

      Communication was fine in the office but when I install in the orchard it loose some data.

      I did try a lot of things on the web.
      Here is the list I have been try to solve the problem but no luck yet.

      1. 800mA 3.3V LDO saperate Power to the module
      2. 2x 10uF LDO in/out
      3. 100UF Al Cap, 2x 10UF ceramic Capacitor on base board
      4. 100uF , 2x 10uf On the module
      5. warp the module with tinfoil
      6. bigger antenna ( a little bit improved)
      7. 3M corded antenaa ( no difference)
      8. change mysensors config to MY_RF24_PA_LEVEL RF24_PA_MAX ( no difference)

      Is there any other option?
      It's really strange, the module specification is 1km but even not working properly within 20meter..
      I don't think there is interference because it is installed rural area..

      Sorry for bad English;;

      posted in Troubleshooting
      yd kim
      yd kim

    Latest posts made by yd kim

    • RE: MYSBootloader 1.3 pre-release & MYSController 1.0.0beta

      I did success with MySBootloader 1.3 beta 3 (https://github.com/mysensors/MySensorsBootloaderRF24 )
      It works both arduino and OTA firmware upgrade however it takes longer to boot up (means switch to firmware) about 3-5seconds.
      I'm using MYSensors 2.1.0 and MYController (http://www.mycontroller.org) on arduino pro mini 8Mhz 3.3V.

      How many sensor you try at the same time?
      From memory When I do firmware update for 3-4 sensors, I have to change "Tx message processing delay" to 300ms.
      If it's shorter than 300ms, keep rebooting some stage.

      I didn't use MYScontroller but probably it has similar setting.

      posted in Development
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @gloob
      Arduino doesn't matter up to 5V so I don't mind for arduino.
      If I feed same power to arduino, I need bigger LDO and also less efficiency.

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @fleinze

      I keep reading the article.. interesting
      The module which on the link is too expensive for my project;;

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @gloob
      nRF module should not use over 3.6V and Li-Ion battery is 4.2V when it is full charged.

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @flopp
      Gateway : ESP8266 ( use 3A switching step down power module)
      Node : Arduino pro mini 3V ( Arduino use battery power directly and nRF24L01 use 3.3V LDO 800mA one with 0.3V drop down )

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @MiKa
      Device is installed in rural area. There is only one wifi. I don't think there is jamming or interference..
      I don't have RF scanner. If I couldn't find any other solution , probably I need to build RF scanner to check it..

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @flopp

      Whole system is Li-Ion battery powered system with solar.
      Gateway has 3S2P Li-Ion battery with proper solar panel. Battery voltage never go under 11V.
      Node has 1x18650 Li-Ion battery with small solar panel.
      Node goes sleep mode for 10 minutes then wake up and send data within 10 second.

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @flopp
      At the first time I use default antenna but it was same issue so I bought exactly same long antenna. It make a little bit better but not perfect..
      I knew what you are talking about. It wasn't normal so a little bit expensive compare to normal wifi antenna.

      Thank for your concern.

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @flopp
      I use nRF+LNA+PA on both.

      posted in Troubleshooting
      yd kim
      yd kim
    • RE: NRF24L01+PA+LNA distance problem

      @fleinze
      Thank you for your quick response. Well I use custom PCB which has plenty of GND area on the board.
      Anyway will keep think how to make better ground for the module.

      posted in Troubleshooting
      yd kim
      yd kim