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nRF24L01+ long range, learn from my mistake

flopp 13 Apr 2016, 19:30 last edited by

If you would like to buy a new nRF24L01+ so you can get more range, don't do like I did. I will tell you what i did.
I bought this(link below) and was waiting and waiting and today finally it arrives, yeah. Kids had gone to bed and I was going around my house checking range before change.
Changed the nRF24L01+ with standard PCB antenna to new NRF(link), checked mA and the new NRF was 1 mA below!!!, I have heard that long range NRF should draw much more that you need external power source. Not this one!!!
PCB antenna ~13 mA, long range 60 mA maybe?
I walked around my house again and still same range like old NRF, strange. Went in to this forum and found my mistake.
I had bought a normal NRF but with an SMA antenna, WHAT??? Like always I am so excite to order quickly so I didn't see that this is NOT PA and NOT LNA.

So before you order check that the NRF is PA and LNA. Sometimes I order same item but from 2 different sellers and sometimes even from 2 different placed like ebay and aliexpress, if the item disappear or take extra long time to arrive. I checked my second order and that was a PA and LNA, yeah, so now i am back to wait until it arrives. Puhh

Good luck

http://www.ebay.com/itm/281962954019?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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I have success! (oops, that's suppose to be Timer1) I only sample for 1/60 of a second. What I did was to back up all the timer registered I used and then resorted them after I was done sampling. (As opposed to initializing the registers in setup and then starting the timer when needed.) Now I have a Nano sampling the data and sending it to a MySensors Gateway on an RPi3B+ which then sends it to an MQTT broker runing on an old laptop. Also running on the laptop is Home Assistant running inside of VirtualBox. If MySensors does use Timer1, it appears that restoring the registers allows it to be shared. //------------------------------------------------------ISR ISR(TIMER1_OVF_vect){ // interrupt service routine for overflow TCNT1 = TimerPreloadValue; // must be first line! starts the timer counting again digitalWrite(TRIGGER_START_SAMPLE_PIN,HIGH); samplesVolts[--sample]=analogRead(VOLTS_IN_PIN); // decrement before capturing samplesCurrent[sample]=analogRead(CURRENT_IN_PIN); digitalWrite(TRIGGER_START_SAMPLE_PIN,LOW); if (!sample){ // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,LOW); // indicate that sampling is complete samplingEnd = micros(); TCCR1B &= 248; // turns off timer } } //------------------------------------------------------sampleOneCycle void sampleOneCycle(){ // back up timer registers uint8_t TCNT1_b = TCNT1; uint8_t TCCR1B_b = TCCR1B; uint8_t TCCR1A_b = TCCR1A; uint8_t TIMSK1_b = TIMSK1; // configure timer which starts the sampling noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = TimerPreloadValue; // preload timer //TCCR1B |= (1 << CS10)|(1 << CS12); // 1024 prescaler TCCR1B &= 248; // turns off timer? TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt ISR // demark sampling sample = NUMBER_OF_SAMPLES; // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,HIGH); samplingStart = micros(); TCNT1 = 65535; // first trigger right away! TCCR1B |= 1; // turns on timer interrupts(); // enable all interrupts // wait for sampling to be complete while(digitalRead(TRIGGER_START_SAMPLE_PERIOD_PIN)){}; samplingEnd = micros(); // restore timer registers TCNT1 = TCNT1_b; TCCR1B = TCCR1B_b; TCCR1A = TCCR1A_b; TIMSK1 = TIMSK1_b; }

nRF24L01+ long range, learn from my mistake

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nRF24L01+ long range, learn from my mistake

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