💬 Stamp size MySensor node

[GertSanders]

@alexsh1

And here is a ZIP file with my complete atmega328p definitions

0_1465854396475_atmega328p.zip

[alexsh1]

@GertSanders Many thanks for your help. This is probably my bad luck, but I have mixed up C1 and R1 mounting them vertically (not horizontally). What a stupid mistake really given that I have checked it a few times. Anyway, now everything is working.

FYG, I looked at your pins_arduino.h - this is a standard one and it is not correct. I corrected the following entries:

static const uint8_t SS   = 14;
static const uint8_t MOSI = 15;
static const uint8_t MISO = 16;
static const uint8_t SCK  = 17;

static const uint8_t SDA = 27;
static const uint8_t SCL = 28;
#define LED_BUILTIN 8

static const uint8_t A0 = 23;
static const uint8_t A1 = 24;
static const uint8_t A2 = 25;
static const uint8_t A3 = 26;
static const uint8_t A4 = 27;
static const uint8_t A5 = 28;
static const uint8_t A6 = 19;
static const uint8_t A7 = 22;

[GertSanders]

@alexsh1
OK, I will check also on my side :-) Thanks for the feedback.

[alexsh1]

@GertSanders No worries! And signing works flawlessly on this node as well with ATSHA204A by the way :)

[alexsh1]

[GertSanders]

@alexsh1
Double plus good !
As I have no signing capability on my raspberry-turned-gateway I'm glad the hard work to simplify signing was done so well by @tbowmo and @Anticimex. Even without testing it I could assume it would work.

[Anticimex]

@GertSanders You are welcome :) Btw, if you just patch in support to generate random data for a nonce, you can use the soft signing backend on rPi.

[GertSanders]

@Anticimex
Well that sounds simple, but I'm more a hardware contributer, this is beyond my capabilities :-), especially in unix arena. I manage software developers for a living, so I know how much I do not know.

[macieiks]

Hello guys,

I am about to solder first PCB of this version. Just to be 100% sure, regarding C4 - what is the best value to use 1uF or 10uF, because I can see we can choose.

Regards,
Maciek

[GertSanders]

@macieiks

Better to use 10uF. The schematic needs to be updated (still shows 1uF, I use 10uF now).

[macieiks]

@GertSanders

Thank you for the update,
Last part what I am missing is battery holder. I was trying to search it in many stores located in my country however I was not able to get it. Is there any internet shop when I can buy online? I have one workaround to soldier different CR battery holder and connect via wires.

[alexsh1]

@macieiks I bought the battery holder on http://www.ebay.co.uk/

[AWI]

@alexsh1 The link directs me to ebay home page... (possibly a country issue) can you give the name of the item so I can search?

[alexsh1]

@AWI I just put a link to an eBay. You put "Keystone 3013" in the search and hit search :-)

http://www.ebay.co.uk/itm/KEYSTONE-3013-BATTERY-THM-RETAINER-16MM-/271911714571?hash=item3f4f337f0b:g:PsQAAOxyx-BSa7y-

[AWI]

@alexsh1 :+1: (although pretty expensive...) building on your reference I found this
Should do the job..

[scalz]

@alexsh1 do you plan to use this so small coincell with rfm69? very curious to see results regarding internal res during RX-Tx times...1.8V brownout should not be far i think..or maybe not :) because the voltage won't stay at 3v ;) but to counter effect, a nice capa at input with a current limiting resistor could help. reading/waiting voltage stabilize before transmitting can help too (I'm doing this with some CR2032 based nodes)

[alexsh1]

@AWI I only needed one or two and ordering 30 despite it is cheaper per unit, was probably too much for me.

[alexsh1]

@scalz Yes, that's the plan, but I think I'll come across many difficulties. For now I have the nrf24l01+ version fully working. And started scratching the surface with RFM69. This is nrf24l01+ SMD version and swapping it for RFM69 is not going to be easy. So far I have not seen any adapters for the SMD version.

[alexsh1]

I have just updated a stamp size node to MySensors 2.1.1 and had to include the following into the sketch:

#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10
#define MY_SOFTSPI
#define MY_SOFT_SPI_SCK_PIN 13
#define MY_SOFT_SPI_MISO_PIN 12
#define MY_SOFT_SPI_MOSI_PIN 11

The fist two lines are not required (it is in the MyConfig.h), but for me to understand how nrf24l01+ is connected.
I hope it helps

Regards
Alex

[henninne]

Hi @GertSanders, @alexsh1

I'm considering to build a few nodes with this design, could anyone that have done and tested these give some feedback on how it work? Battery life etc. In my case I will mostly use it as window/door sensor and water leakage sensor so it would not send data to frequently.

Thanks for any input.