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    Igor Katkov

    @Igor Katkov

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    Best posts made by Igor Katkov

    • RE: NRF24L01+ range of only few meters

      [Update for future generation]
      I think I found my issue. It was the large transceiver see image below, with power amplifier and external antenna.
      Once I replaced both receiver and transmitter with identical units, range got significantly better.
      60m clear sight and almost whole house through multiple walls.

      For whatever reason small unit can't hear ACK from the PA unit. I tried to reduce power on the PA end to

       radio.setPALevel(RF24_PA_MIN); 
      

      but it did not seem to have any effect. My best guess now is that oscillator on the PA unit is slightly off. PCB antenna unit is battery powered.
      Power source to arduino UNO that drives PA unit is good, 5V less that 2mV ripple. The transceiver is powered via 3V3 output (onboard regulator) of UNO though, could it be the problem?

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: Which Lab Power Supply?

      Some ppl suggest - DIY.
      The problem with DIY is that you need to know well what are you doing and you also need tools to debug your power supply when it does not work. Non of that applies to a typical novice.
      I suggest getting one of the low-end bench grade power supplies ~$100 on amazon.
      Example: http://www.amazon.com/gp/product/B00FPU6G4E

      Make sure you don't try to save $20 and buy the cheapest possible with low precision pots.
      Hi precision pots a re like $10+ a piece alone so you are likely to save nothing if decided to upgrade yourself. I did that and I regret it.

      One bench power supply is not enough so you can DIY your second one.

      posted in Hardware
      Igor Katkov
      Igor Katkov

    Latest posts made by Igor Katkov

    • RE: NRF24L01+ range of only few meters

      One might think that to measure ripple noise of $2 Chinese power supply ~$70 unit is an overkill 🙂

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: Which Lab Power Supply?

      What are the benefits of software controlled PSU versus turn-knob style?

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: NRF24L01+ range of only few meters

      @Oitzu DSO138 scope is like $25 from aliexpress

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: Which Lab Power Supply?

      Some ppl suggest - DIY.
      The problem with DIY is that you need to know well what are you doing and you also need tools to debug your power supply when it does not work. Non of that applies to a typical novice.
      I suggest getting one of the low-end bench grade power supplies ~$100 on amazon.
      Example: http://www.amazon.com/gp/product/B00FPU6G4E

      Make sure you don't try to save $20 and buy the cheapest possible with low precision pots.
      Hi precision pots a re like $10+ a piece alone so you are likely to save nothing if decided to upgrade yourself. I did that and I regret it.

      One bench power supply is not enough so you can DIY your second one.

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: NRF24L01+ range of only few meters

      @Oitzu
      I though antenna ground and MCU ground is the same thing

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: NRF24L01+ range of only few meters

      Typically you point it up. It gives you vertical polarization.
      You point both transmitter and received wire antennas same directions.
      It's possible that your chips are at fault, if non of other tricks worked (capacitors, clear power, enough current, short wires, lo-noise rf spectrum channel) try other transceivers.

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: radio init fail !!!

      It must be something very dumb. Check that you have a solid galvanic connection to nrf modules on all lines.

      posted in Troubleshooting
      Igor Katkov
      Igor Katkov
    • RE: Removing pro mini led bricked the board

      I think @carlierd means that resistor '102' (1kOmh) is serially connected with led. It's also on the side so removing it much easier - you just heat one side and push then another side and push away. In the reference design I think this 102 is actually R11.
      Correct me if I'm wrong.

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: Raspberry Pi 3 with 64-bit quad-core SoC, built-in Wi-Fi and Bluetooth announced for $35

      @hek Speech recognition is a fantastic idea, I've added it to my list of may be projects!

      posted in Hardware
      Igor Katkov
      Igor Katkov
    • RE: Raspberry Pi 3 with 64-bit quad-core SoC, built-in Wi-Fi and Bluetooth announced for $35

      Is there any use for all this CPU power in home automation scope?
      I struggle to find any use for them.

      posted in Hardware
      Igor Katkov
      Igor Katkov