Sensebender Micro
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It was measured by @blacey to 0.05 mA while sleeping and 0.95 mA during transmit. @tbowmo got some higher figures but they were most probably related to running a NRF24L01+ clone.
@jeylites
Yes, have a look at the bootloader here:
https://github.com/mysensors/Arduino/tree/master/MYSBootloader
You can test OTA updates using the MYSController. It overwrites program memory in-place during boot. If communication goes down or fails during this process the node won't boot up again (you have to upload a new sketch while connected to you computer).The sensbender has a external flash which means we can safely store the OTA firmware while normal sketch is running. When everything has been downloaded the DualOptiboot moves new firmware from flash to program memory during bootup. The code for this has been written (in development branch) but has not been tested yet (I failed handsoldering them :() .
@hek I computed that sending a value every minute with a 10 seconds of communication every minute (wakeup), the autonomy for a single 3V 1500mA CR123 lithium battery is around 1 year (312 Days). Around 2 year for a dual Lithium AA, I guess.
If there is 5 second of wakeup every minute, it's 500 days for a single cell CR123.
Purely theorical... but it gives an order of magnetude. -
I posted some measurements above. Hard to say a definite battery life expectation. Depends on many factors such as battery quality, send frequency and what external sensors you attach.
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absolute maximum voltage is 3.6V, above that you'll let the magic smoke out of the following components:
- Si7021
- external flash
- radio module.
Only the atmega328 and atsha204 will survive.
@Hausner said:
Would this work with a 3,7V Li-Ion 18650 cell? Because I've got a S... load from old laptops
@tbowmo said:
absolute maximum voltage is 3.6V, above that you'll let the magic smoke out of the following components:
- Si7021
- external flash
- radio module.
Only the atmega328 and atsha204 will survive.
Refering to what @tbowmo said and if you measure your batteries you will find that they will give more than 4V when fully charged I came to the conclusion that this is not a good idea.
However if someone has a good proposal for how these kind of batteries are best used with the Sensebender Micro I would like to know also.
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Really nice board!
I think it would be good to have ( ver 2? ) a space for a voltage reg. Perhaps as an option, just put the pads on the pcb and user can add regulator if they need to.
This way larger batteries such as the 18650 cells could be used. -
Really nice board!
I think it would be good to have ( ver 2? ) a space for a voltage reg. Perhaps as an option, just put the pads on the pcb and user can add regulator if they need to.
This way larger batteries such as the 18650 cells could be used. -
It's designed to be a simple, minimal, small sensor node.. Operating from 2xAA batteries. So there is no need for voltage regulator onboard, I know this both simpilfies the circuit, but also makes some limitations on the powersource.
What you are asking for, is an Arduino Nano, this has voltage regulator, and the number of IOs that you want :)
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It's designed to be a simple, minimal, small sensor node.. Operating from 2xAA batteries. So there is no need for voltage regulator onboard, I know this both simpilfies the circuit, but also makes some limitations on the powersource.
What you are asking for, is an Arduino Nano, this has voltage regulator, and the number of IOs that you want :)
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So the shipment will start today for the preorders? I'm really excited to receive the new sensors.
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I must ask one thing.
Which Radiochannel are there as default in the code in the sensebender Micro??
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@korttoma said:
It would be nice to know how many devices has been preordered.
see the post above your latest? ;) I have just written it ther :)
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Well, first batch was 200 units (180 sold). Guess they want a few spare once if they have failures during test.
They are preparing for batch two but the Si7021-A20-GM humidity sensor was a bit hard to source at the moment. Will be solved soon. Not sure why preorders was disabled though, will check.
