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Some Nordic Dev Kits for offer.

Jokgi 26 Jan 2021, 05:00 last edited by

Hello,
I have a few offical Nordic Dev Kits available if anyone would like them. 2 nRF24L01P kits with RF modules and main boards and a few nRF51-DKs. I am in the Pasadena, CA area near JPL. If anyone would like to meet to do a hand off let me know.
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General Discussion • 23 Mar 2014, 21:38 • ToSa 1 Mar 2015, 11:21

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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.
"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • 24 Jan 2024, 23:06 • wrendral 3 Feb 2024, 07:13

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3 Feb 2024, 07:13

@wrendral said in "Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design": I will go with a Li-Po Battery type: 304048 3.7V 1200mAh Might work, but maybe the internal protection will trigger with the high current peaks. I'd suggest you plan a 0 Ohm, (2512/THT) resistor as R2 and then replace it with a 100Ohm/1Watt if the protection triggers.
Best VOC sensor for detecting a wide range of VOC's?
Hardware • 26 Oct 2023, 23:59 • NeverDie 18 Nov 2023, 01:41

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

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5 Dec 2023, 02:21

I bought the Every because it implied it was backward compatible with the nano. No, it's not, as we found out. Be that as it may, any word on a getting the Every working with mySensors?
Sleep mode for bmp280
Hardware • 20 Feb 2018, 13:24 • fishermans 5 Feb 2024, 18:30

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5 Feb 2024, 18:30

Just wanted to say thanks for this, it is still relevant and useful six years later !

Some Nordic Dev Kits for offer.

Suggested Topics

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

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • 24 Jan 2024, 23:06 • wrendral 3 Feb 2024, 07:13

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

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

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

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

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Some Nordic Dev Kits for offer.

Suggested Topics

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

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design" Hardware • 24 Jan 2024, 23:06 • wrendral 3 Feb 2024, 07:13

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

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

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

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

1Online

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

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • 24 Jan 2024, 23:06 • wrendral 3 Feb 2024, 07:13

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

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

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

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

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