Help getting my first sensor working please

6 years 8 months ago #949 by HarryDutch
I assume you have checked that the chip is a NRF24L01+ and not a NRF24L01?

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6 years 8 months ago #951 by EasyIoT

PaulRB wrote: I'm using 100uF on one and 470uF on the other. They were pretty close to the power pins of the radio modules, but I have moved them as close up to the radio modules as I can. I have also added small caps, 0.1uF, also as close as poss to the component's power pins. Absolutely no change, I'm afraid.

I wonder if I have particularly poor quality radio modules. Unfortunately almost all the other ones on eBay look exactly the same as mine! I have seen some with metal covers, but they are much more expensive.

One of the 3 modules I have is a high-power one with a detacheable antenna. I've tried swapping that for each of the two smaller modules (the ones with antenna on the pcb) but this also has not helped.

Another possible source of interference is my 3G dongle. Having no DSL available at the property, I use this as my internet connection. It is plugged into the wifi router, also less than a metre away. I might try disconnecting that temporarily later.


It is possible, that you are using busy channel. There is demo program called scanner for NRF24l01 and it shows traffic on each channel. I've tested this program there where I live and channels between 1-90 are pretty busy. This are allowed frequencies in EU. Above this channel there is no traffic. I'm using channel 95 and all works great. Try to change channel.

Also if you are using NRF24L01+PA module (with detachable antenna) the current consumption is bigger - I'm using AMS1117 for 3.3V power supply and 1000uF capacitor. If you do not provide enough current it won't work.

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6 years 8 months ago #955 by PaulRB

HarryDutch wrote: I assume you have checked that the chip is a NRF24L01+ and not a NRF24L01?

Yes, I can see a tiny "+" on the chip under a magnifying glass! I bought a couple of the 24l01 non-plus a while back, they have 10 pins not 8. Still in a box somewhere...

EasyIoT wrote: It is possible, that you are using busy channel. There is demo program called scanner for NRF24l01 and it shows traffic on each channel.


I'll google for that and try it.

EasyIoT wrote: Also if you are using NRF24L01+PA module ... If you do not provide enough current it won't work.

I'm using that on the 3.3V supply from the Pi, with the 470uF cap. Do you think that will be enough?

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6 years 8 months ago - 6 years 8 months ago #956 by PaulRB
Here is the output from scanner. What does this tell me? Are these channels quiet or busy?
RF24/examples/scanner/

Scanning all available frequencies...Scan completed.
028 (2428Mhz): 72 - ******************************************************
029 (2429Mhz): 152 - ******************************************************
030 (2430Mhz): 198 - ******************************************************
031 (2431Mhz): 252 - ******************************************************
032 (2432Mhz): 290 - ******************************************************
033 (2433Mhz): 331 - ******************************************************
034 (2434Mhz): 374 - ******************************************************
035 (2435Mhz): 412 - ******************************************************
036 (2436Mhz): 466 - ******************************************************
037 (2437Mhz): 548 - ******************************************************
038 (2438Mhz): 601 - ******************************************************
039 (2439Mhz): 601 - ******************************************************
040 (2440Mhz): 601 - ******************************************************
041 (2441Mhz): 601 - ******************************************************
042 (2442Mhz): 601 - ******************************************************
043 (2443Mhz): 601 - ******************************************************
044 (2444Mhz): 601 - ******************************************************
045 (2445Mhz): 601 - ******************************************************
046 (2446Mhz): 601 - ******************************************************
047 (2447Mhz): 601 - ******************************************************
048 (2448Mhz): 601 - ******************************************************
049 (2449Mhz): 601 - ******************************************************
050 (2450Mhz): 601 - ******************************************************
051 (2451Mhz): 601 - ******************************************************
052 (2452Mhz): 601 - ******************************************************
053 (2453Mhz): 601 - ******************************************************
054 (2454Mhz): 601 - ******************************************************
055 (2455Mhz): 601 - ******************************************************
056 (2456Mhz): 601 - ******************************************************
057 (2457Mhz): 601 - ******************************************************
058 (2458Mhz): 601 - ******************************************************
059 (2459Mhz): 601 - ******************************************************
060 (2460Mhz): 601 - ******************************************************
061 (2461Mhz): 601 - ******************************************************
062 (2462Mhz): 601 - ******************************************************
063 (2463Mhz): 601 - ******************************************************
064 (2464Mhz): 601 - ******************************************************
065 (2465Mhz): 601 - ******************************************************
066 (2466Mhz): 601 - ******************************************************
067 (2467Mhz): 601 - ******************************************************
068 (2468Mhz): 601 - ******************************************************
069 (2469Mhz): 601 - ******************************************************
070 (2470Mhz): 601 - ******************************************************
071 (2471Mhz): 601 - ******************************************************
072 (2472Mhz): 601 - ******************************************************
073 (2473Mhz): 601 - ******************************************************
074 (2474Mhz): 601 - ******************************************************
075 (2475Mhz): 601 - ******************************************************
076 (2476Mhz): 601 - ******************************************************
077 (2477Mhz): 601 - ******************************************************
078 (2478Mhz): 601 - ******************************************************
079 (2479Mhz): 601 - ******************************************************
080 (2480Mhz): 601 - ******************************************************
081 (2481Mhz): 601 - ******************************************************
082 (2482Mhz): 601 - ******************************************************
083 (2483Mhz): 601 - ******************************************************
084 (2484Mhz): 601 - ******************************************************
085 (2485Mhz): 601 - ******************************************************
086 (2486Mhz): 601 - ******************************************************
087 (2487Mhz): 601 - ******************************************************
088 (2488Mhz): 601 - ******************************************************
089 (2489Mhz): 601 - ******************************************************
090 (2490Mhz): 601 - ******************************************************
091 (2491Mhz): 601 - ******************************************************
092 (2492Mhz): 601 - ******************************************************
093 (2493Mhz): 601 - ******************************************************
094 (2494Mhz): 601 - ******************************************************
095 (2495Mhz): 601 - ******************************************************
096 (2496Mhz): 601 - ******************************************************
097 (2497Mhz): 601 - ******************************************************
098 (2498Mhz): 601 - ******************************************************
099 (2499Mhz): 601 - ******************************************************
100 (2500Mhz): 601 - ******************************************************
101 (2501Mhz): 601 - ******************************************************
102 (2502Mhz): 601 - ******************************************************
103 (2503Mhz): 601 - ******************************************************
104 (2504Mhz): 601 - ******************************************************
105 (2505Mhz): 601 - ******************************************************
106 (2506Mhz): 601 - ******************************************************
107 (2507Mhz): 601 - ******************************************************
108 (2508Mhz): 601 - ******************************************************
109 (2509Mhz): 601 - ******************************************************
110 (2510Mhz): 601 - ******************************************************
111 (2511Mhz): 601 - ******************************************************
112 (2512Mhz): 601 - ******************************************************
113 (2513Mhz): 601 - ******************************************************
114 (2514Mhz): 601 - ******************************************************
115 (2515Mhz): 601 - ******************************************************
116 (2516Mhz): 601 - ******************************************************
117 (2517Mhz): 601 - ******************************************************
118 (2518Mhz): 601 - ******************************************************
119 (2519Mhz): 601 - ******************************************************
120 (2520Mhz): 601 - ******************************************************
121 (2521Mhz): 601 - ******************************************************
122 (2522Mhz): 601 - ******************************************************
123 (2523Mhz): 601 - ******************************************************
124 (2524Mhz): 601 - ******************************************************
125 (2525Mhz): 601 - ******************************************************
126 (2526Mhz): 601 - ******************************************************
127 (2527Mhz): 601 - ******************************************************
Scanning all available frequencies...

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6 years 8 months ago #963 by HarryDutch
Have a look here:

forum.mysensors.org/topic/903/question-a...01-and-signal-issues

It's about signal issues and also an example of how the output of the NRF24 scanner should look like.

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6 years 8 months ago #965 by PaulRB
Thanks for that but it was of very limited help. The output from scanner shown on that thread looks very different from my output above. And I'm not sure the poster was any the wiser by the end of the thread - very confusing!
It almost looked as though they had baud rate set incorrectly on serial monitor, except that the first line was ok...

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