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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@AlexOwen
@Kolban, I don't have any real NeoPixels here unfortunately. The circuit could well be the problem.
@MarkusGritsch, I've taken out the D15 reference for anyone that looks at it later. The timing is definitely flakey and sometimes it doesn't quite work out, but what I'm doing isn't mission critical so I don't care too much if it sometimes goes wrong. I have no idea why I needed the setTimeout(), but it was a lot more flakey without it.
@Gordon, it seems slightly contentious as to whether the ESP8266 is 5V tolerant, but I've not had any problems using a 5V signal yet. I have some logic level shifters I'll try out too. I can borrow a scope but it's going to be a few days before I have the time to do much with it.
I'll report back what I find and hopefully somewhere in there will be something useful.