I am working on a wearable IOT device project. I am using a GC9A01 round display module, 4 tact push switches, a micro SD card reading module, and a Bluetooth module(possibly HC-06 or HM-11). What is the smallest Arduino board I could find with enough pins for all these parts? It would be best if the board has Bluetooth capability already.
There are a lot of possible ways of building this and I cannot see in my crystal ball what these parts or what the interface will be. Posting a preliminary block diagram as a starting point would be helpful showing all the different parts. Is this one of a kind or will it be much larger volumes. Do you want to do a custom board? Knowing your skill set would help.
How many pins do you think you need ?
have a look at the Seeed Studio XIAO nRF52840 which is small and has BLE onboard - no need for a seperate bluetooth module
is there sufficient IO for your application?
what do you think about a M5-Stack- which will include an ESP32 + Display + Buttons + battery + nice box already?
+1 for this, I have one of these and it's absolutely ridiculous how small it is. Though like most things you connect, it'll probably require a custom shield to split ground, 5v and connect everything nicely. It's a shame the SD is required though, though there should be enough ports.
My guess is you're making a wrist Bluetooth MP3 player/watch. Which is strangely something the Fitbit/Pixel & Apple watches cannot do. Which is rather disappointing.
That is exactly the kind of device I'm trying to create. I will take a look at the datasheet for more information, but at first glance, that should do the job. It's even smaller than the charging module I'm using.
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