Single Layer Through Hole Arduino 328 & NRF24 PCB

Updated layout and format

After using this in one of my other projects (wireless tank gauge) , ive come to find something i overlooked and did not notice in my initial use. While the 328p (1.8v-5.5v) will happily run off 2xAA (or AAA) batteries either Alkaline or NIMH the NRF24 is a little more fussy, and is rated for 3v3, apparently though it can handle 5v logic connections but the vcc must be 3v3. So as my 2xAA NIMH started to discharge it cut out at 2.6v, so its more suited to the upper charge states of 2 alkalines (2.6v-3v), or 3 nimh (2.8v-3.6v).

I have quite a few of the V1 PCB's printed that i did not use, as the project scope they where part of changed. If any one is interested in some for free let me know .

At this point im marking this project complete. It was part of a larger project i may document here to one day as well as a coulpe of other older and new projects.

Here is Version 2, all IO pins are brought out for easy re-purposing, the vcc ripple cap as a spot (C2) and the reed switch spacing is wider.

Here you can see the 2 changes i made to version one to use it, a 100nF ceramic capacitor between 328 vcc/gnd to smooth power ripple, and a new entry hole for the wider magnetic reed switch i was supplied.

This is the fuse & boot loader settings for arduino boards.txt :

atmega328bb.name=ATmega328 8MHZ 1.8V BOD

atmega328bb.upload.protocol=stk500
atmega328bb.upload.maximum_size=30720
atmega328bb.upload.speed=57600

atmega328bb.bootloader.low_fuses=0xE2
atmega328bb.bootloader.high_fuses=0xDA
atmega328bb.bootloader.extended_fuses=0x06
atmega328bb.bootloader.path=arduino:atmega
atmega328bb.bootloader.file=ATmegaBOOT_168_atmega328_pro_8MHz.hex
atmega328bb.bootloader.unlock_bits=0x3F
atmega328bb.bootloader.lock_bits=0x0F

atmega328bb.build.mcu=atmega328p
atmega328bb.build.f_cpu=8000000L
atmega328bb.build.core=arduino:arduino
atmega328bb.build.variant=arduino:standard

And a photo of my home made ISP burner, with interchangeable crystal: