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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
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epierre Hero Member 25 Nov 2014, 16:10 last edited by

this is a HopeRf chipset, there is a post on supporting RFM12b already
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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.
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Hardware • mysensors interrupt nano interrupts esp • 6 Jan 2024, 19:39 • OldSurferDude 11 Jan 2024, 04:39

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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; }
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Semtech SX1276 long range tranceiver

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Semtech SX1276 long range tranceiver

Suggested Topics

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

Arduino Nano Every problem Hardware • 1 Feb 2020, 09:18 • hakha4 5 Dec 2023, 02:21

hlk-pm01 are to noisy for rfm69? Hardware • 5 Aug 2023, 21:16 • Tmaster 9 Aug 2023, 16:28

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

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

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1Online

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