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Battery life on nrf52840 using meshing.

I have developed a ble5 long range and meshing product but my life is way to short. using 2-3.6v batteries in parallel and only getting 2 months life in my battery calculations and I know I should be getting a lot more can anyone help me ? 

Battery Lifetime Report

 

 

For a week

Function

Description

Current consumption

Unit

Duration

Periodic

BLE Radio

GDM Open Alarm

10.8

mA

24 hours

24 * 7 hours

 

Close Alarm

 

 

280 s

 

Sleep mode

Wake on GPIOTE input

2.36

uA

Rest

 

- Battery

3.6V 1.2 Ah * 2

- Current consumption for a week

Sum = 10.8 * (24 + 280 / 3600) + 2.36 / 1000 * ( 24 * 7 – 24 – 280/3600) = 260.38 mAh

- Lifetime

Lifetime = 1200 * 2 / 260.38 * 7 = 64.5 days

 

 

 

Therefore, battery life time is about 2 months

Parents
  • Could you describe your mesh network ? Which nodes are relay node, what is the communication between them ? 

    As mentioned by Marciano, relay nodes and normal mesh nodes require main power. You can run a low power node on a battery. But this node can't relay mesh message. 

    You mentioned that with Bluetooth 5 you have longer range, which feature of Bluetooth 5 you used that improve the range ?  

  • Ok I have a transmitter mounted to a garage door using 2-3.6v batteries in paraelle when door is closed transmitter is in sleep mode when door opens transmitter awakens and send signal to receiver (nodes) . the receiver starts to blink LED lights and make a beeping noise. the distance in range with just one node is about 90 feet indoors then another node further. the receiver nodes are plugged into a usb wall charger and have full power supply at all times.  but battery life is way to short. I am not sure what you mean by what feature of bee long range I am using ? we are using the blue nrf52840 chip with long range and meshing. the nodes are not running on battery only the transmitter. and it is in beacon mode. 

  • Could you clarify are you really using mesh or you are just using Bluetooth Low Energy (start network, point to point, one central node and multiple peripheral node) ?

    If you are using mesh, which technology are you using ? How many node in the network ?

    Could you explain what is the "Open Alarm" and "Close Alarm" ? Why the duration is 24 hours and 280s ? Even if the duration of the alarm is 24 hours, you don't need to transmit data all the time, continuously for 24 hours, correct ? 

    Please describe in more detail the "Long Range" mode you are using, what radio configuration do you have ? Which output power ? 

Reply
  • Could you clarify are you really using mesh or you are just using Bluetooth Low Energy (start network, point to point, one central node and multiple peripheral node) ?

    If you are using mesh, which technology are you using ? How many node in the network ?

    Could you explain what is the "Open Alarm" and "Close Alarm" ? Why the duration is 24 hours and 280s ? Even if the duration of the alarm is 24 hours, you don't need to transmit data all the time, continuously for 24 hours, correct ? 

    Please describe in more detail the "Long Range" mode you are using, what radio configuration do you have ? Which output power ? 

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