💬 Button size radionode with sensors swarm extension

[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.

[yury]

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

worth

uh... apparently, yes. dual dip cr2032 is hard to find item on ali.

[Miroslav Kadaně]

@koresh Hello,
can you please update pcbdoc and schdoc files ?
And add a pcb adapter from RFM69HCW to RFM69CW ?
Thx Mirek

[Koresh]

@miroslav-kadaně
Hello Mirek. All source files are actual, I used exactly the same files to produce latest stable version. I never share source files until I test the board. So I will share updated files (like on the latest screenshot or better) after the board will be checked and tested :wink:
PS
I've added rfm converter board.

[chbla]

With the default sensor and sketch I only get integer values - shouldn't this be decimals with 2 digits after the . ?
Not sure if I have a different lib or missed something

[chbla]

This post is deleted!

[chbla]

What's the typical time you get with the default node, coin cell and the sketch on github?
https://gist.github.com/solars/6116b78ea7ee581ecfafddb8da4a9610

It drained within only 1 day for me

[gohan]

is it sleeping 5 seconds only?

[chbla]

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

is it sleeping 5 seconds only?

You are right, that was my mistake after testing it. However, the consumption still seems high.
For example I'm right now testing a BME280 which I want to use in the future, with the following sketch:
https://gist.github.com/solars/a5302f1cb60d90f89d7e37d5e23f8c4d

It's connected to SDA/SCL and GND/V - somehow the voltage it receives with a fresh battery is already quite low, and it also doesn't last very long.

[gohan]

you need to try to measure current while the sensor is sleeping as it should be a few uA maximum

[chbla]

@gohan I only have a normal multimeter - what's the best way to do this?
I came across https://www.eevblog.com/projects/ucurrent/ a while ago, is it worth it?

[gohan]

There is a project in openhardware for a current meter if you want to build one, or you could buy a newer multimeter if the one you have can not measure uA

[yury]

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

multimeter

You should be fine even with a cheap multi-meter as long as it has uA scale.

should be around 7-10 uA and if you do not send JDEC to sleep it is 17 -19 uA.

to send JDEC to sleep\wakeup I use
_flash.wakeup();
_flash.sleep();

light sensor should be sent to sleep explicitly also.

[gohan]

@yury not really, I have bought an Aneng cheap multimeter, but if I connect it with uA scale selected it will go out of range during node boot and cut the circuit making measurement impossible (unless you do something fancy that would make it unpractical)

[yury]

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

selected it will go out of range during node boot and cut the circuit making measurement impossible

my cheap one survives 20mA surge (RFM69 CW version) of initial communications and displays good reading afterwards. if you burned fuse inside, try replacing it temporarily with some thin wire for this uA tests.

[gohan]

I have another cheap one that works. I didn't blow the fuse since turning it off and on it works again, it must be a software limitation