Which microcontroller to choose?

Question

Programming

Good day. There is a certain device that receives data from the accelerometer, looks for patterns in them that were previously recorded in memory, and if they match, sends a logical unit to the Bluetooth 4.0 smartphone.
It is necessary to choose a microcontroller that will be:
a) small in size (no more than 0.7x0.7)
b) with low power consumption (the device should operate on a 100-500 mAh battery for at least a few days or a week)
c) relatively easy to learn
I would be grateful for advice in choise.
Z.Y. Ideal - MK with BT / accelerometer on the same chip

Answer 1

Googled:
ST LIS331EB Accelerometer with built-in MCU Cortex-M0

Answer 2

something from TI's CC25xx. There's cortex m3, BLE, good documentation and a handy free environment. They also sell a certain sensor tag - debugging on these chips with all sensors, incl. accelerometers, and among the samples there is sending readings for bt to a program on ios

Answer 3

Make a list of electronics stores in the city. Go talk to the sellers about what they have, delivery times, prices, where they get it from (farnell, chip, etc). And then write on the chip, and then it turns out that the delivery will take 6 months. Or the programmer will not be available.
The list of possible chips will immediately be reduced :)

Answer 4

On aliexpress there are modules with what you wrote, just fill in the firmware you need and that's it. work on 3 AA for up to six months (declared), there are low-power stm, they also work on batteries for a very long time. there is a special atmega read - for embedded electronics - by the way they showed, they promised up to 2 years from one battery (but there the price was much higher than the average and the batch was from 1000)