💬 Sensebender Micro

[Dominic Amann]

I assume there is no exposure to the SPI bus on this board?

[sundberg84]

@Dominic-Amann from the hardware site:

MYSx 2.6 with
Dedicated UART
Dedicated SPI
Dedicated Interrupts
I2C bus (shared with onboard eeprom)

[Dominic Amann]

Ah - right, the radio connector uses SPI.

[tbowmo]

@Dominic-Amann

There are multiple SPI ports in use, one of them is dedicated to the expansion header (which follows MYSx 2.6 standard)

[RWoerz]

Can somebody please post what this boards current draw is at 8Mz w/wo a radio. Because it will live in a crawl space It's going to be plugged in. I've also added a very simple water detector.

[tbowmo]

@RWoerz

normal operating frequency is 48Mhz (if I remember right).. If I remember right, then there is no options in arduino to switch the frequency to 8Mhz..

[sburlot]

Beware that the Si7021 can return a RH value < 0 or > 100, and Domoticz will not store it. Clamp the humidity to a valid range to avoid losing values.

Lately, my Sensebender reported values of 101-104 during the night. Took me some time to understand why Domoticz complained it didnt receive any values.
It received these values, but didnt like them.

See section 5.1.1 of the Si7021 datasheet says:
Due to normal variations in RH accuracy of the device as described in Table 4, it is possible for the measured value of %RH to be slightly less than 0 when the actual RH level is close to or equal to 0. Similarly, the measured value of %RH may be slightly greater than 100 when the actual RH level is close to or equal to 100. This is expected behavior, and it is acceptable to limit the range of RH results to 0 to 100%RH in the host software by truncating values that are slightly outside of this range.

[dklinkman]

So cool that the micro as a node reports its battery level to the UI (I'm still on the FTDI power, hence > 100%)

-d

[stefaanv]

Is there a board definition for sensebender micro for PlatformIO available ?

[martinhjelmare]

@stefaanv

https://forum.mysensors.org/topic/2725/sensebender-micro/29

[mvader]

Am I able to remote reboot the sensebender micro? I can send an OTA firmware if i manually press the reset button.
but can i use the reboot command in MYScontroller? it doesn't seem to do anything when issued.

[tbowmo]

@mvader

Is it the default dualoptiboot bootloader? Then the bootloader itself does not support OTA FW. You need to put a sketch on it, that supports OTA. (Default sensebender micro sketches doesn't)

[mvader]

@tbowmo said in 💬 Sensebender Micro:

@mvader

Is it the default dualoptiboot bootloader? Then the bootloader itself does not support OTA FW. You need to put a sketch on it, that supports OTA. (Default sensebender micro sketches doesn't)

yes it's the default bootloader. yes i have OTA added to the sketch. it works if i reset the device via manual reset. but what i'd like to do is send the reboot command from myscontroller. but it seems to do nothing ever. does the bootloader support reboot? or is that something i also have to add to the sketch?

situation: i have about 15 sensors all over the house. if i update, i'd like to be able to assign the firmware, and then issue the reboot command. so upon reboot, they take the assigned firmware. what i don't want to do is have to go to each one and manually press the reset button to get it to take the firmware. i'm sure it's healthier to run up and down 3 flights of stairs. but i'm lazy :)

[tbowmo]

@mvader

The sketch should support reboot, try sending I_REBOOT to one of your nodes (info can be found here, look under internal messages)

I haven't tried it myself yet, as I haven't touched my sensebender micros for ages..

[joaoabs]

Hi,
Three questions regarding SenseBender Micro:

• What board should I configure in Arduino IDE in order to upload sketches? Would it be equivalent to Arduino mini pro, or is there any "board library" to load ?(Didn't find it, Woudn't it make sense to be included in the examples/Libraries pack?)...
  (Found it: https://github.com/mysensors/ArduinoBoards . If you look between the photos above there is a simple link lost in the between)
  MySensors Admins: Just a small suggestion: As it is now, - a simple link between photos is easily overlooked. Can't you place it near the specs where it should be more visible?

• It has an I2C bus for the SI7021, but it seems the ATSHA204A (which I believe its I2C also) is connected to another pin (a3). Does this mean it has two I2C buses?

• Can anyone confirm that the port that measures the battery voltage is A0?

Thanks,
Joaoabs

[Anticimex]

@joaoabs we do not support I2C variant of atsha204a. Only single wire variant.

[tbowmo]

@joaoabs

It uses the internal vref to measure the battery voltage. Some of the theory is described here https://www.sciencetronics.com/greenphotons/?p=1521

[joaoabs]

For the battery powering voltage measuring do you mean that this is not needed after all? (https://www.mysensors.org/build/battery#measuring-and-reporting-battery-level)
It would be just a matter of enabling the flag "#define BATT_SENSOR 199 " and no resistors needed?

[tbowmo]

@joaoabs

Yes, when you power it directly of f.ex. two AA batteries, then you can use the secret trick mentioned in that article that I linked to, for measuring battery voltage without external resistors.

[joaoabs]

Sorry for the dummy question, but my SenseBender Micros came with a small white sticker on top of the Si7021 sensor (like in the pictures above). Is it supposed to be removed or to stay like that?