Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

Semtech SX1276 long range tranceiver

korttoma Hero Member 25 Nov 2014, 07:32 last edited by

Stumbled upon an interesting transceiver chip from Semtech called LoRa SX1276. It is supposed to have very long range and low current consumption. Very expensive if compared to the NRF24L01 but maybe it could be useful for someone to know it exists.

http://forum.arduino.cc/index.php?topic=261859.0
Reply Quote 0
1 Reply Last reply
Loading More Posts
2
Posts

2.1k
Views
Reply

Reply as topic
Log in to reply
epierre Hero Member 25 Nov 2014, 16:10 last edited by

this is a HopeRf chipset, there is a post on supporting RFM12b already
Reply Quote 0
1 Reply Last reply

2
Posts

2.1k
Views

1 out of 2

Suggested Topics

Over the air updates
General Discussion • 23 Mar 2014, 21:38 • ToSa 1 Mar 2015, 11:21

87

1
Votes

87
Posts

50.4k
Views

1 Mar 2015, 11:21

I would really like to get OTA working here as it's freezing outside and I have to go there to update the software in the greenhouse control system. So please, can we have a 'how to' step-by-step guide to OTA? Please? S.
Best VOC sensor for detecting a wide range of VOC's?
Hardware • 26 Oct 2023, 23:59 • NeverDie 18 Nov 2023, 01:41

3

1
Votes

3
Posts

36
Views

18 Nov 2023, 01:41

@eiten I haven't yet made any progress on finding a good VOC sensor, but along the way I did find out something interesting regarding CO2: namely, if you sleep with your bedroom door closed at night, then the odds are good that the CO2 levels rise to surprisingly high and unhealthy levels. The better CO2 sensors are factory calibrated and never again need recalibration for the life of the sensor (usually around 10 years or so), because they are used in HVAC systems to control fresh air intake to guarantee indoor air quality. As a for instance, here is one such CO2 sensor: https://www.digikey.com/en/products/detail/senseair/006-0-0008/15790694 At around $50 for just the sensor element itself, it's not exactly cheap, but then again, I'd say it's worth it, because who wants to be burdened by remembering to calibrate their CO2 sensors? Ideally, I'd like to find a sensitive VOC sensor that also will never require calibration. Nearly all, and maybe all, of the off-the-shelf IAQ montoring stuff that you might buy for, say, $300 or less seems to require periodic calibration. For that reason, this might be one of those occasions where build is rather than buy.
Sensor to detect marijuana vape/smoke
Hardware • 21 Jan 2025, 06:36 • Hellmark 25 Feb 2025, 20:56

4

0
Votes

4
Posts

27
Views

25 Feb 2025, 20:56

There are air quality monitors that can detect VOCs (volatile organic compounds), and some that claim to pick up marijuana smoke specifically. Devices like the Airthings Wave Plus, uHoo Air Sensor, or Plume Labs Flow could help identify changes in air quality. Another option is checking with industrial-grade smoke detection companies that provide sensors for businesses and schools, and some of them may also have solutions suited for home use. If you want more information on vape-related products, including how they work and their components, check out Geek Bar Pulse X Platinum Edition. Understanding vape devices can help recognize patterns of use or detect scents earlier.
Sleep mode for bmp280
Hardware • 20 Feb 2018, 13:24 • fishermans 5 Feb 2024, 18:30

7

4
Votes

7
Posts

3.3k
Views

5 Feb 2024, 18:30

Just wanted to say thanks for this, it is still relevant and useful six years later !
Newbie questions
Hardware • 14 Feb 2025, 20:03 • magwas 14 Feb 2025, 20:03

1

0
Votes

1
Posts

4
Views

No one has replied
Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • 6 Jan 2024, 19:39 • OldSurferDude 11 Jan 2024, 04:39

2

0
Votes

2
Posts

21
Views

11 Jan 2024, 04:39

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; }

Semtech SX1276 long range tranceiver

Suggested Topics

Over the air updates
General Discussion • 23 Mar 2014, 21:38 • ToSa 1 Mar 2015, 11:21

Best VOC sensor for detecting a wide range of VOC's?
Hardware • 26 Oct 2023, 23:59 • NeverDie 18 Nov 2023, 01:41

Sensor to detect marijuana vape/smoke
Hardware • 21 Jan 2025, 06:36 • Hellmark 25 Feb 2025, 20:56

Sleep mode for bmp280
Hardware • 20 Feb 2018, 13:24 • fishermans 5 Feb 2024, 18:30

Newbie questions
Hardware • 14 Feb 2025, 20:03 • magwas 14 Feb 2025, 20:03

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • 6 Jan 2024, 19:39 • OldSurferDude 11 Jan 2024, 04:39

0
Online

11.5k
Users

11.1k
Topics

112.8k
Posts

Semtech SX1276 long range tranceiver

Suggested Topics

Over the air updates General Discussion • 23 Mar 2014, 21:38 • ToSa 1 Mar 2015, 11:21

Best VOC sensor for detecting a wide range of VOC's? Hardware • 26 Oct 2023, 23:59 • NeverDie 18 Nov 2023, 01:41

Sensor to detect marijuana vape/smoke Hardware • 21 Jan 2025, 06:36 • Hellmark 25 Feb 2025, 20:56

Sleep mode for bmp280 Hardware • 20 Feb 2018, 13:24 • fishermans 5 Feb 2024, 18:30

Newbie questions Hardware • 14 Feb 2025, 20:03 • magwas 14 Feb 2025, 20:03

Does MySensors require Arduino Timer 2? Hardware • mysensors interrupt nano interrupts esp • 6 Jan 2024, 19:39 • OldSurferDude 11 Jan 2024, 04:39

0Online

11.5kUsers

11.1kTopics

112.8kPosts

Over the air updates
General Discussion • 23 Mar 2014, 21:38 • ToSa 1 Mar 2015, 11:21

Best VOC sensor for detecting a wide range of VOC's?
Hardware • 26 Oct 2023, 23:59 • NeverDie 18 Nov 2023, 01:41

Sensor to detect marijuana vape/smoke
Hardware • 21 Jan 2025, 06:36 • Hellmark 25 Feb 2025, 20:56

Sleep mode for bmp280
Hardware • 20 Feb 2018, 13:24 • fishermans 5 Feb 2024, 18:30

Newbie questions
Hardware • 14 Feb 2025, 20:03 • magwas 14 Feb 2025, 20:03

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • 6 Jan 2024, 19:39 • OldSurferDude 11 Jan 2024, 04:39

0
Online

11.5k
Users

11.1k
Topics

112.8k
Posts