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).

Simple deep discharge protection for battery operated sensors?

Maschler last edited by

Hello everybody,

I have a few mobile battery powered Ardruinos to measure the temperature. These are powered by 3 AA batteries. But always one of the three batteries is deeply discharged (0V!). To avoid this in the future, I wanted to ask if someone knows a simple circuit that prevents this? If it is possible, this circuit should not require much power.

Hope I am here in the right area of the forum
Reply Quote 1
1 Reply Last reply

1
Posts

439
Views

Suggested Topics

Over the air updates
General Discussion • • ToSa

87

1
Votes

87
Posts

50410
Views

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.
Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

2

0
Votes

2
Posts

21
Views

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; }
"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • • wrendral

10

0
Votes

10
Posts

42
Views

@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.
New user has questions
Hardware • • Doggie

7

0
Votes

7
Posts

50
Views

I am new in this forum and I have a question regarding mysensors and iobroker. I did not work with mysensors up to now. Since some weeks I use iobroker installed on a raspberrypi. Now I want to integrate my 433 Mhz doorbell in iobroker. I know, that there is an adapter for mysensors in iobroker. My question is: Is it possible to get a notification in iobroker if someone is pressing the button on my doorbell? As I understood, I have to connect the receiver to an arduino nano and connect the arduino to my rasberrypi on which iobroker is running.
Sensors and more
Hardware • • Robert Leverett

1

0
Votes

1
Posts

15
Views

No one has replied
Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

5

1
Votes

5
Posts

70
Views

It probably has to do with fewer people buying them once summer ends, so companies might lower prices to clear out stock before winter.

Simple deep discharge protection for battery operated sensors?

Suggested Topics

Over the air updates
General Discussion • • ToSa

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • • wrendral

New user has questions
Hardware • • Doggie

Sensors and more
Hardware • • Robert Leverett

Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

9
Online

11.4k
Users

11.1k
Topics

112.7k
Posts

Simple deep discharge protection for battery operated sensors?

Suggested Topics

Over the air updates General Discussion • • ToSa

Does MySensors require Arduino Timer 2? Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design" Hardware • • wrendral

New user has questions Hardware • • Doggie

Sensors and more Hardware • • Robert Leverett

Best time of year to buy higher quality small project solar panels? Hardware • • NeverDie

9Online

11.4kUsers

11.1kTopics

112.7kPosts

Over the air updates
General Discussion • • ToSa

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

"Remote Irrigation with LoRaWAN: LM27313 Challenges and PCB Design"
Hardware • • wrendral

New user has questions
Hardware • • Doggie

Sensors and more
Hardware • • Robert Leverett

Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

9
Online

11.4k
Users

11.1k
Topics

112.7k
Posts