A tiny, barebones Arduino for interfacing with 3.3V sensors
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I built this project so that I could interface with 3.3V sensors/radios easily because few Arduino Pro Mini clones are 3.3V or have a small form factor.
The costs are about $6 per board, the major cost factors being OSHPark ($2.30) and the ATMEGA328P ($2). Other significant components are the resonator and reset button, coming in at around $1.50.
Full Schematics and layout have been uploaded!
minimal.schd10 is the LEDx-eagle-schematic - 188.83 kB - 03/27/2018 at 13:23 |
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minimal.brdx-eagle-board - 86.09 kB - 03/27/2018 at 13:23 |
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Whoops! Forgot to add in the schematic and layout files! The next step is to add in a CP2102N chip so that it has onboard USB! How cool will that be?
This is a tiny run so the cost is high per board. If there is a way to keep the overall cost low as well as reduce the price per board, I would love to hear the breakdown! :D
Nice work but I like Kevin Darrahs 328 Board better. http://mklec.com/project-kits/kd-circuits/DIY-328-board-ATMEGA328P-microcontroller-board
Why not 2mm pitch? Would save even more space probably
Connectors for the 2mm pitch are not common, so I opted for the more common 0.1" standard.
You could reduce the cost of this a lot. Get around 160 boards for $11 from jlcpcb with shipping, change the resonator to a cheaper crystal and (given they're likely just reset switches without a huge amount of usage) source your switches from ebay:
I agree for the boards! However they take a while to ship and the shipping costs outweigh usually double the price.
I wanted to keep the component count low, and SMDs, so I opted for a resonator instead.
Thanks for the link on the switches! That will certainly drop the cost by a lot!
Why do you need an external resonator when you have an 8 MHz RC oscillator inside of ATmega328 ? I recently converted an Arduino Nano clone for full 1.8 to 5V operation with internal oscillator. Is the resonator more stable than RC oscillator ? Hope so..
Typically resonators are more stable than internal oscillators. I believe this is true for the ATMEGA328P as well.
Do you have a datasheet of the resonator you're using ? I've never used the kind you're using.
This is the datasheet: http://datasheet.octopart.com/PBRC8.00MR50X000-AVX-datasheet-2504.pdf
Nice! Which regulator are you using, and do you know if it comes in a 3.0V version? I have similar needs, but for 3V devices.
3.3 or 3V? I was using a 3V battery so I didn't need a regulator. I think the SPX3819 is a suitable regulator, it comes as an adjustable as well as 3V and 3.3V regulator. If you want USB -> Serial, the CP2102N has an internal 3.3V regulator that can supply up to 100mA!
Ben Lim
Saimon
arief ibrahim adha
Manuel Bl.
Alex
as my estimation, the production cost should be half of your cost....$3 totally :)