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Increasing reliability of MySensors network hardware

Alexander Ivanov last edited by
Hi Everyone,

I'm building MySensors network and really care about overall network stability and reliability. In this topic I don't want to touch software topic and focus only on hardware environment. Can somebody help to answer questions below to finally create FAQ on MySensors hardware?
1. What is the best Arduino Pro Mini for nodes powered with power supply - is it 3.3V or 5V version, or it doesn't matter at all ?
2. If we take 3.3V version - does internal power regulator have really enough power (with capacitor) for radio module in worst case? Or it's better to use LE33A (even if I use radio module with extended range)?
  BTW, LE33A is 100mA only, I'm not sure it's enough for worst cases, probably it's better to use L4931CZ33 (250mA versions)?
3. I plan to use one power supply in basement and many (~20-30pcs) long (10-30 meters) power wires to Arduino nodes. What kind of capacitors it's better to use at the end of power wires? And what kind of capacitors are the best to use on radio power?
4. Which voltage range is the best for powering Arduino Pro Mini? I planned to use 12V but it's upper limit and it's probably better to use something like 6V?
5. I plan to use resettable fuses for nodes, could you recommend proper value for them. Is 100mA too low?
6. Does anybody care about node PCB coating to additionally protect them against humidity?
Thanks in advance
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@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.
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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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