Which Arduino for my project?

Projects General Guidance
1

Hello,

I need to find the smallest available Arduino in order to start my project. I need it be able to connect with:

Can you advise me on this? I found the TinyDuino project and was wondering if it could suit my needs (https://tiny-circuits.com/products/tinyduino/).

Bonus question: I wonder about how to provide an easy way to charge the battery, I would like to do it over RF, would this drastically change the size of the overall? Since it's to be embedded and space is a huge issue I might simply not do it.

Thank you very much.

2

I think all you need is a ProMini. Use a USB/Serial adapter to program it, remove when done.

Coin cell battery won't last long. Low current output capability, and not much capacity.

No experience with RF recharging.

3

You can also consider pro micro (all these confusing names, pro, mini, micro, nano). It's even smaller than pro mini and is compatible with Leonardo.

4

Thanks, Pro Micro/Pro mini, how can I power supply them?
In the end I will need a chargeable battery so NFC seemed neat. Anybody knowledgeable in this?

I am still not sure how to interface the bluetooth and sensor boards to this, how can you be sure it can interface with them? I need to be sure before purchasing.

Won't TinyDuino work as well? Except for the battery I mean.

5

bluetooth is generally a serial interface to the board. sensor same as connecting to an Uno, add headers, or solder wires to the holes.
bluetooth module will dwarf the tinyduino, I'd go with something a little larger that will be easier to make connections to.

6

The sensor simply connects to arduino. You need to find library to talk to the sensor (should be easy with popular sensors). The arduino boards need either 5V on usb port or at least 7V on a power barrel or Vin pin from ground pin to function.

7

8 MHz Promini will work within spec down to below 2.7V.
Coin cell battery as power source remains a concern.
Have you resolved anything re: non-contactless charging?

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8

If you search "induction battery charger" you can find a lot of things

Maybe one will fit the size you after.

9

For your bonus question, how far is the setup (receiver part of wireless charging) from any stationary object (emitter)?

10

Thanks for your input.

CrossRoads:
Have you resolved anything re: non-contactless charging?

Not yet, I ordered an Arduino (the one recommended) and also a TinyDuino since it has handy shields and I want to experiment. My concern here is not to make a final product but a prototype, in the end I will ask someone more knowledgeable than me to carry on and potentially resolve this charging issue.

I had hoped that for now a coin cell battery could do it so I can demo the whole system without needing a wire, but it seems I've been too optimistic.

Inductive battery charging is the way to go indeed, I'll see what I can make once I receive the parts.