💬 Button size radionode with sensors swarm extension

[Koresh]

@Miroslav-Kadaně I've just uploaded latest gerbers (rfm reset pin was connected to controller, connection of si1132 was fixed, reverse battery polarity protection was added). You can place PCB order at any factory. :wink:

[chbla]

Maybe a stupid question but how do you connect the FTDI adapter? I only know the ISP pins

[getlarge]

@yury @koresh

Few months ago, I've ordered some of your nodes, which work perfectly by the way, but I needed something that could speed up testing of any sensors.
So following our conversation on Github with Yury, I've created a PCB based on your Button size node, with a field for an extension board. The aim is to have a versatile board, and extensions that could handle virtually any sensors, like NodeManager project, but for hardware ;)
And it's also a first time experiment in the land of PCBs

Apart 2 errors ( maybe more in the future !), it seems to be well routed, as tests been proving, but i still not tried the FOTA function.
Errors was a badly routed button and it seems that, after the RFM chip is soldered, communication with USBasp gets bad! Is it because SCK and MISO route ( from pin headers to atmega328 ) goes through the RFM chip before atmega ?

You were mentioning some mods in dualoptiboot in order to flash M25P40, https://forum.mysensors.org/topic/3160/ota-flash-types-for-mysensors/43.
Would it be possible to share these ?

And just out of curiosity, how did you manage to solder SI7021 and TSL2561 ?
By now, it seems like a mystery for me...

[Koresh]

@getlarge said in 💬 Button size radionode with sensors swarm extension:

after the RFM chip is soldered, communication with USBasp gets bad

Did you solder R4 (from your schematic https://github.com/getlarge/Cosmonode/blob/master/Cosmonode_sch.pdf)? I can't find it on the boards photo.
PS
Will share compiled bootloader and sources soon.

[getlarge]

@Koresh said in 💬 Button size radionode with sensors swarm extension:

Sorry, picture's quality is not too good!
R4 ( 10Kohm) is soldered. I read about that pullup resistor that is needed to sync with atmega SCK. Any other hint on what could cause that ?
Maybe, that was a mistake when i changed the fuse? but I didn't have problem before with these settings.

So I'll have to be patient to use M25P40!

[chbla]

@chbla said in 💬 Button size radionode with sensors swarm extension:

Maybe a stupid question but how do you connect the FTDI adapter? I only know the ISP pins

Can anyone quickly tell me how to do it correctly? I thought it didn't work but I'm unsure.

[Koresh]

@chbla This board has standard FTDI header (see attached screenshot).

But it also has all of ISP pins (mosi, miso, sck, rst)

[hiddenuser]

@Koresh Might be a dumb question I am planning to work on this board, where do I find the complete part list.

[hiddenuser]

Does any one have links to dirty pcb or OSH Park? Thanks a lot

[NeverDie]

^^^warning: it's an infiltration bot.

[Miroslav Kadaně]

This post is deleted!

[hiddenuser]

@NeverDie Not sure if you are referring to me?

[hiddenuser]

@Miroslav-Kadaně Thanks!!

[hiddenuser]

I do not have an electronics background. I wend through the pdf files and order the parts and looks like I got the wrong resistor and capacitor or wrong part. Looks like I have to wait for an expert to comment let me know which resistor/capacitor goes where what part size. I would love to hear from someone ;)

[Miroslav Kadaně]

@koresh it is possible to buy this adapter (RFM69HCW -> RFM69CW) or download pcb files ?
Thx

[NeverDie]

@miroslav-kadaně said in 💬 Button size radionode with sensors swarm extension:

@koresh it is possible to buy this adapter or download pcb files ?
Thx

Go to this link and press the download button: https://www.openhardware.io/view/299/Button-size-radionode-with-sensors-swarm-extension

[Miroslav Kadaně]

@neverdie thx, but i need adapter from RFM69HCW to RFM69CW

[yury]

Re: 💬 Button size radionode with sensors swarm extension

2 cr2032 winter upgrade - works nice

Keep working at -20 Celsius in a fridge. voltage dropped from 6 Volts to 5V and keeps pretty stable while sending temperature reading every 2 minutes for 2 days now.

[Koresh]

There are so many reasons to use two CR2032 batteries in series with power converter instead of one lager battery like 2450
-CR2032 are much more widespread batteries
-Wider temperature range
-Stable voltage during all battery lifetime (using voltage converter)
-Stable radio power during battery lifetime
-Batteries give less current during transmitting so they are not "shocked" by high current.

So I plan to create version with two CR2032 batteries holder (like on the Yury's photo) and the ultra high efficiency DC-DC converter based on the tps62745 (400 nA quiescent current, 90% efficiency)

:wink:

[NeverDie]

The main problem is finding a button holder that can hold two CR2032's in series. So far I've only found two. One is made by Linx, but it's definitely not ideal:

The other works fine, but it has a larger footprint, so I'm not presently using it. It may work well on your board, though, because your board is square, so you can use the diagonal:


On the other hand, maybe you could bend down the tabs and use it as a through-hole?
I did one where I simply cut-off the tabs and then soldered it to the board. That works, but it leaves me with an uneasy feeling as to how long it might last in that configuration. Maybe it's worth re-visiting.