Another possible board - ATMega328, nRF socket, DHT22 socket, MOSFET, Uno pinout

[AWI]

@obstler42 Oops... . Just tried again and found out that my uA meter was on "autorange". Only a factor 1000 off... I'm sorry for that, how can I compensate. for this stupid mistake..

[obstler42]

I've made so many mistakes myself trying to optimize for lowest power consumption battery deplyment...

BTW: another gotcha: don't leave the NRF24 on the board when connecting to a 5V FTDI... the FTDI connector voltage pin does NOT go through the voltage regulator but straight to VCC -- which means you'll be roasting the NRF24 with 5 V...

[AWI]

@ceech Since you are the creator of this board. I am interested in how you use it. Especially how to operate this board on battery power and the power consumption..

[ceech]

@AWI
I normally use a 12V car battery, for monitoring different values in the car. When the board is used in single cell battery applications, I go with a different type of voltage regulator. Normally I use TC2117 3.3V voltage regulator. Unfortunately those regulators are not available for purchase either form Farnell nor Microchip at the moment. They will be available on the 9th of March. So a bit of a set back. As for the enclosure, I use this:

And a little 5V solar cell, when appropriate:

there is also a matter of battery charging, which I leave to this fellow:

http://www.ebay.com/itm/221533778016?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I'm also preparing a new board, with integrated battery charger for LiPo, LiIon batteries and some other cool features.

[ceech]

@AWI Here is a graphical explanation of the socket connections:

SDA and SCL lines also have pull-up resistors. They are 10k.

[AWI]

@ceech Thanks!!

[rachmat aditiya27]

how to upload custom bootloader?maybe you should put additional icsp port

[ceech]

@rachmat-aditiya27 The board is kind of hardware oriented, so I ran out of space for the ICSP header. All the needed pins are available though. Either from remaining pins of the NRF24 socket, either from digital 11, 12 and 13 header pins.

[rachmat aditiya27]

oh, okay got it :)

[Raoul Hecky]

Hello,
I just got 2 boards and I'em trying to test them. For now I only plugged a usb/serial adapter with an ftdi to the JP3 connector to program the board. The program is simple as Serial.begin(9600); Serial.println("test");

But that's not working. The programming was done successfully, and when I open the Serial monitor in the arduino ide, all I got is garbage characters. I have setup the correct communication option in the ide of course. The power VCC comes from my USB and I tried with 3.3v or 5v, but it did not change anything.

When I do the with a standard arduino mini pro, it works correctly, but not with the @ceech boards...

Any idea why and whats wrong here?
thanks

[sharath krishna]

@Raoul-Hecky said:

9600
may be a baud rate setting error.... else its possible that there is a mismatch of frequency btw the controller HW and the software it is complied for..just a thought

[AWI]

@Raoul-Hecky Did you use the Arduino Pro or Pro mini (3.3v 8mHz) w/ ATmega328 setting?

[ceech]

@Raoul-Hecky If you can't make the board to work properly, let me know. I'll send you a replacement :)

[Raoul Hecky]

I finally made them work :)
I was not using the right clock for programming, 16MHz instead of 8MHz...
Thanks @AWI ;)