@mfalkvidd I was looking to your sketch and could not quite understand this piece of line

result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.110231000

How will this above line change if I use 4 AA battery ?.

Thanks in advance

@iotcrazy I understood the voltage divider part by googling. So this is the only option to find the battery percentage right ? We cannot determine by connecting directly to Raw when input if more than 3.3 v.

@mfalkvidd sorry if questions seems like a dump . What do you mean by passive ? every sensors needs some voltage to perform a task right ?

I tried connecting a DHt11 Temp and humidity sensor using a arduino pro min(with led and voltage divider removed). It is connected to 2 AA battery. Unfortunate the node sends out value(proper value) only when I power on the Mini. It never sends the data again. However if I disconnect power supply and re attach it , it again sends the data. any idea what I am doing wrong ?

Also , whats the best way to create a Node which needs to monitor a sensor which uses 5 V . Arduino Mini is 3.3 V which.

Thanks

@mfalkvidd since you are using 2 AA battery(3V max) with a sensor , how are you powering the sensors ? What sensors are you using ?.Most of the sensors need 5V right ? how are you providing the required voltage for sensor ?. If possible can you share a circuit diagram or close up picture for your sensor node with connection to NRF , Sensor and battery ?

Appreciate it .

Is it possible to send the data from gateway to Azure Iot Hub ?

I am looking into this link https://www.mysensors.org/build/battery to modify my mini so that I can save the poer consumption.

I bought A mini from Aliexpress which looks like this
http://www.aliexpress.com/item-img/10pcs-lot-Pro-Mini-328-Mini-3-3V-8M-ATMEGA328-3-3V-8MHz-for-arduino/1967122432.html?spm=2114.10010108.100005.10.R6Hobi

This looks different from what is shown on mysensors page. Now per mysensor I need to

1. Disconnect the Arduino's power indicator LED by cutting the track between the LED and the resistor in series. Saves about 1.5 mA
2. Disconnect the 3.3 VDC regulator because it is not needed. Cut the Vout pin with a sharp fine wire cutter. See images to the right on how to locate regulator. Saves about 220 uA

since my Mini looks different , I am having problems trying to cut the required components. Can anyone help how to modify the Mini I bought from aliexpress.

Thanks

@iotcrazy I understood the voltage divider part by googling. So this is the only option to find the battery percentage right ? We cannot determine by connecting directly to Raw when input if more than 3.3 v.

@mfalkvidd Yes I am connecting to RAW input. My 4 battery holder for some reason does not work with 2 or 3 batteries so connecting 6V to RAW.

"...you'll have to use a voltage divider to one of the pins..." Can you elaborate this part ? Can you share a link which wherein Arduino Pro Mini is powered through RAW input and battery percentage is calculated. I very new to hardware but loving the mysensors projects. Kindly bear with my stupid questions.

Appreciate your patience..

@mfalkvidd I was looking to your sketch and could not quite understand this piece of line

result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.110231000

How will this above line change if I use 4 AA battery ?.

Thanks in advance

I have seen instructions on mysensors (https://www.mysensors.org/build/battery)to get the battery percentage , but having trouble creating it.
Does anyone have links or video for implementing the same ?. I am looking for a sample code along with instructions with circuits to test the remaining power in terms of percentage.

Thanks

@Pierre-P you controller image looks great . What controller is it ?

@mfalkvidd Great project. Had few questions...Is it OK to provide 6V to Arduio Mini ? Can you show /explain how you have provided power supply to Mini and Moisture Controller ? In the set up you have , how long does the battery last ?

Thanks