ESPGeiger

Yes V.7, I only tried 0.6.x a couple of times but that didn't work either. I've been trying to get the code into Ardunio IDE by installing all the libraries but the 1306 library used is a bit of an odd one and I can't find that in library manager. Arduino IDE might seem a few steps backward but at least I can make sense of it, platformio the code is all over the place and I find it difficult to follow. I can get the automatic build/upload of the cloned github to work under platformio of course but making alterations to the code is a struggle. I'll be really interested in your findings with an ESP32.

Thanks for that info, at least it's not all my fault then I'll try comparing the ESP32 with ESP8266 startup code and see if there's a difference that stands out. I know now I could get the boards working with 8266's but they're all cased with ESP32's attached and I would hate to remake them all.

Edit: I went back as far as V.5 bin files - which didn't work either but for a different reason - and after more poking around in the code I get the feeling this was never actually tested on an ESP32... Definitely not optimised anyway, e.g., it's using SoftwareSerial lib which is not necessary for ESP32 as it has 3 hardware serial ports. Anyway, I'm leaving it until such time as the author provides an update. I have ordered some Wemos D1 boards to play with so maybe I can lash something together just to get the 3 counters working/uploading.