Minimal design thoughts

[AWI]

@Roberto-Brunialti I am looking forward to this board also. I deployed a few Devduino V4's. These are really well built but lack the "minimal" size, have only a few connectors (enough in most cases as a good temp/hum sensor is on board).. And "restrict" you to the use of non-rechargable CR123 cells (3V,no regulator). I will love the very small footprint combined with the flexibility in power sources (and extra features) in the "Minimal design thoughts" design. :heart_eyes:

[tbowmo]

Think we should rename the thread to "Mysensors Micro" as this is the new name, since it's the first "official" board from mysensors.

Anyway, just got a couple of pictures from the factory in China, they have build the first batch of 5 pcb's that they are verifying at the moment, and then they should be shipped to us (either @hek or me?) and then we need to verify it, before giving a go on the production.

So we are comming closer to a "launch" of the device.

[hek]

@tbowmo

Yep, might also be good to create a new thread in Announcement when it has been launched (and is for sale) with a back-reference here for history/design decisions made by you.

I should probably start working on a more complete page on the main site with more details and illustrations.

[Tibus]

In your design, C3, the nrf 4u7 capacitor, is a classic ceramic capacitor. In the mysensors tutorial, they write a polarized capacitor is better for the NRF. I use tantalum capacitor wich are bigger but is there a difference with the ceramic one for the nrf. I would like to use a ceramic 0603 too if there is no difference for nrf.

Thank's

[tbowmo]

@Tibus

In theory ceramic capacitors should be better, it has a lower ESR, and are better suited to reduce ripple, or noise on the supply locally, as it has a faster response to power requirements, than equivalent electrolytic capacitors.

[Mickey]

will it be possible to use this board pcb without soldering the sensor , flash and security chip?

[tbowmo]

@Mickey

Yes, you can use it without those mounted. But I don't think that we are going to sell it without those components mounted

[Roberto Brunialti]

Any good news about the d-day (delivery day :smiley: ) ?

[hek]

Small production run of 200 units started this morning. :)

[Mickey]

@hek said:

Small production run of 200 units started this morning. :)

You would run-out of units very soon...

[Roberto Brunialti]

when preorders will be available ?

[hek]

@Roberto-Brunialti

I will check with Itead Studio if their shop can handle pre-orders.

[tbowmo]

@Mickey

Then we will make another 200 (or more, depending on requests) :)

[hautomate]

What's the expected price point for these?

[tbowmo]

@hautomate

They are going for 14$ plus shipping.. Expected shipping date is set to 20th of May.

(the project is receiving about 1$ for each unit sold)

/ Thomas

[gadu]

Oh! Where do I order?! Been waiting for this!

[tbowmo]

@gadu

An initial product page is up at iteadstudio : http://imall.iteadstudio.com/mysensors-micro.html

We are working on updating product description etc.

[Dwalt]

FYI - ITead is already taking preorders for the board.

[Roberto Brunialti]

Hi, I have ordered some boards from Itead. Just some doubts: is the board a 5v or a 3.3? what's about nrf24 decoupling capacitor? May I assume the nrf24 is correctly powered at 3.3 V by the board?
Sorry but i'm on the "soft" side more than the "hard" ...:-)

[Anticimex]

@Roberto-Brunialti The board is "2XAA" battery, in other words; 3V. Some components on the board won't survive 5V so it is important not to use that voltage. Decoupling for the radio is onboard.