My sensorboard MYS 1.0beta

[Mrlynx]

Original thread got lost in the forumcrash.

I have made a sensorboard that is under testing.

spec:
socket for arduino pro mini 5v/3,3V
socket for radio
3,3v regulator
4 AD input with voltage dividers
7 gpio availble with pullups on all pins

I have som small mods left to do in the voltage dividers.

Is there any interest in boards or kits (board + components) for just a few dollars?

[larky]

Sure, one or two for testing!

[Zeph]

Why external pullups for the pins?

Is there a ground plane beneath the radio's antenna?

[Mrlynx]

The external pullups are for humidity sensor and 1-wire.
Yes there is a power plane and a ground plane under the radio.

[Anticimex]

The ATmega has internal pull-ups on most IO. Is it not adequate to use those for pulls for I2C and sensors? Are they to weak?

[Mrlynx]

The internal pullups is about 50K but for 1-wire and humidity you need a 4,7K ohm resistor.

[djdworks]

@Mrlynx i'll be very happy to buy 10 of them

[p0lar]

Im in for a few. what do I need to provide you with?

[jendrush]

This is sensor board i've made 2 days ago :)

[Mrlynx]

I have updated the layout and added caps to the voltage dividers.
I am now going to order components for a batch of 100 boards.
what pull-up resistors and voltagedividers do you need?
I think that I will supply the kit with some 1K, 4,7k and 10K.
The price for a kit will probably be 7$ + shipping. Just add an Arduino pro mini, radio and sensor to make it a node.
@djdworks and @p0lar are first in line when they are ready.
@jendrush nice work.

[tjay4x4]

@Mrlynx I'm in your boat, wanna get 10 boards.

[jendrush]

@Mrlynx said:

nice work.

Thank you. This is only temperature board, but best part of this board is cost.

Piece of PCB ~30 cents,
pins ~30 cents,
power connector ~10 cents,
capacitor+resistor ~ 10 cents,
3.3V regulator ~ 10 cents
:) less than 1$ for complete board, and about 7$ for all parts including radio, arduino mini, wall usb charger, and cables:) This is power of MySensors!

Thank you @Hek, and rest of the team!

[Mrlynx]

Schematic for the updated MYS 1.1 mys11.pdf

[djdworks]

I had a look to PDF schematics and i have a request to include SDA and SCL pins since many sensors uses such pins if possibile. Thanks a lot.

[Mrlynx]

Only problem is SDA and SCL are located on separate pins on top of the pro mini module and not in the normal row of pins. (A4-A5)

[Zeph]

SDA and SCL seem to come in two places on APM's - inside the row of pins, and sometimes at the end opposite the serial programming pins. A host PCB could allow either.

[Mrlynx]

I have now added SDA/SCL(A4/A5) to MYS 1.1
Is there any more ideas to be added before I send it for production?

mys111.pdf

[p0lar]

cool on the full kit price but can we also get just plain boards? I have a few home-built sensors that I need to upgrade :)

[djdworks]

Well done I'm very happy for SDA and SCL added on the board thanks a lot.

Yesterday night I had a deeper look into the PCB and i was thinking that if you add 3 pins with MISO, MOSI and SCK your board will be good also to build ethernet gateway or connect additional SPI device.

[Mrlynx]

I have thought about the spi channel but I cant really understand why the ethernet gateway sketch uses different CE/CS pins for the radio.
Why cant the radio use pin 9/10 and the ethernet shield 5/6?
Maybe @hek can shed som light on the matter?