ESPimatic on ESP < 4MB flash size

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ESPimatic itself will fit on 512K ESP. Problem is this would leave only 64K for SPIFFS. Not all the HTML files would fit on that tiny bit of SPIFFS.
To solve this, there are a few workarounds:

• Buy a ESP with more flash
  Simplest and easy solution. Use a ESP with more room for HTML files and future updates

• Compress and ditch HTML files
  Don’t upload the HTML files you are not using, and the file you do use compress them with .gz compression

• Alter Arduino boards file
  You can add an alternative ESP board to the boards file, allowing you to give more flash to SPIFFS (if someone hase a guid for this … )

@koffienl hello, where do you buy your esp8266 with 4MB flash? I can’t find any on banggood

Ebay
Look for NodeMCU, Wemos D1 mini or some boards like that

bought mine on aliexpress

Thanks guys!

@koffienl said:

• Alter Arduino boards file
  You can add an alternative ESP board to the boards file, allowing you to give more flash to SPIFFS (if someone hase a guid for this … )

I did an extension to 128k SPIFFS and it works perfect (64k less for code now but still enough). Allready decribed this here:
https://forum.pimatic.org/topic/1225/espimatic-espimatic-esp8266-modular-sensor-for-pimatic-v0-1-26/69

For information: not all ESP-01 have only 512k. You can distinguish them on th color of the board, blue once have 512k and black once have 1M. To be pretty sure, look at the flash memory chip, 25Q40 is the small one and 25Q80 the bigger one.

http://2xod.com/articles/ESP8266 ESP-01 Old Blue vs New Black 1mbit ai-cloud/