Sensebender Micro
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I have also ordered a couple of boards to be able to evaulate them as soon as possible.
Just a question:
- What is the expected lifetime of the batteries if you use 2 AA batteries, the default preloaded sketch and reports the temp and humidity values once per minute?
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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 :() .
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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 said:
@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).If the communication fails, the bootloader will remain "bootloading", i.e. will try to fetch a new firmware from the controller until the CRC matches - no need to upload a sketch via computer.
MYSBootloader 2.0 will have SHA signing implemented: for those nodes without ATSHA204 which need signed OTA updates :)
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@hek said:
@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).If the communication fails, the bootloader will remain "bootloading", i.e. will try to fetch a new firmware from the controller until the CRC matches - no need to upload a sketch via computer.
MYSBootloader 2.0 will have SHA signing implemented: for those nodes without ATSHA204 which need signed OTA updates :)
@tekka said:
Yes, have a look at the bootloader here:
https://github.com/mysensors/Arduino/tree/master/MYSBootloaderDo I have to include those files into my sketch or just install MYS on windows and it will auto detect? In other words, do I have to make any changes to the sketch?
Is there any tutorial on MYS implementation?
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@tekka said:
Yes, have a look at the bootloader here:
https://github.com/mysensors/Arduino/tree/master/MYSBootloaderDo I have to include those files into my sketch or just install MYS on windows and it will auto detect? In other words, do I have to make any changes to the sketch?
Is there any tutorial on MYS implementation?
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You should read up on what a bootloader is and how to install it.
http://www.arduino.cc/en/Hacking/Bootloader?from=Tutorial.Bootloader
Might be good to start another thread if you have more MYSController/bootloader questions, -
is 3V the absolute maximum or 3.3V is acceptable to power it? For non-battery operated sensors, it may be easier to find a 3.3V regulators instead 3V (at least in my country).
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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.
