I am building a smart watch (collar) type device for a dog, this device will need to have a GPS module, heart rate sensor and an accelerometer, it will also need to be relatively small, which microcontroller could you recommend (Wifi and bluetooth needed), and price should be on the cheaper side. Have thus far looked into the Nano 32 are there any other good ones to be considered?
have a look at the ESP32-D1-MINI lot cheaper than the ESP32 Nano
what distances are you looking at - both WiFi and Bluetooth are limited, e.g. typically 10 to 20metres depending on environment
if you require long range look at LoRa, HC-12, etc
Your main challenge will be battery lifetime.
Look for small ESP32 boards like SEEED esp32 variants.
It'll be difficult to beat existing solutions for pet GPS tracking in terms of battery life and volume/portability.
Ensure that the collar you use for your pet doesn't involve the risk of said pet hanging itself. It's kind of traumatic if you end up killing your pet in an attempt to care for it.
Compared to an off-the-shelf product that will suit your definition, your project will cost ten times the price.
Apple Air Tags are cheap, and are reported to work well for tracking pets.
As for the other features, I'm wondering how and where the heart rate sensor will be attached to the dog, and what the accelerometer is for.
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