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Sun 2019.03.17
Thank you @Gordon, for the clarification using the ATMega, confirmed my hunch.
The more I think about the kit phone, the more I realize it just isn't that practical for a mass market product. For the elite, maybe.
Make an Espruino phone
I thought of going the GSM shield route, but as 2G has been (Nov 2017) phased out here in midwest N.A. (less than one year last dying T-Mobile sometime 2020), and the SIM900 (and RAK8212 ??) has non-compatible (okay in Europe/Asia) frequency and speed issues with 3G and 4G, that leaves us with the SIM7000A/G which is very pricey, ~$100USD + S&H.https://www.instructables.com/id/LTE-NB-IoT-Shield-for-Arduino/
https://wolfgangklenk.wordpress.com/2018/09/13/espruino-on-rak8212-getting-started/
Nice device compatibility by region and features tables
The LE910-NAG looks promising also but at ~$250USD !!
Maybe I'll just butcher a burner phone (~$15) and add an inexpensive GPS module and an MDBT42Q A BLE programmable Espruino, 4G SMS command interface long distance GSM accessible, GPS tracking module. That would also not be tidy either and be half the cost. ;-)
@allObjects, As I know you love to tinker, and I know you'll at least be thinking about it, I expect you to have this proof of concept working by tomorrow, okay? wink, winkDid enjoy your 'DIY Marine GPS using enhanced GPS Module' article
http://forum.espruino.com/conversations/255759/#comment11863703
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Robin
@Gordon
I imagine the ESP32 build of Espruino would 'just work' on the phone if anyone wanted to try it?
The makerbuino uses an ATMega though so wouldn't support Espruino.
However if you wanted to make an Espruino phone it's pretty easy to get a Pixl and slap a GSM shield and maybe a KeyPad on it. Not quite as tidy, but half the price.