ESP8266 Community Forum

I'm working on a home automation project my question is how do I load the hardware with the arduino sketch software into several hardware at a time how manufacturers do it in an easy way?

The easiest way I can think of:

• Export your script to a BIN-file: "Sketch" -> "Export compiled binary"
• Get a later version (like v3.4.4 or above) of the ESPFlashDownloadTool
• Start the ESPFlashDownloadTool
• Press the "ESP8266 DownloadTool"-button
• Select the "MultiDownload"-tab
• Load your (previously compiled) BIN-file and select the correct address
• Make sure all available ESP's are correctly selected to their COM-port on the PC
• Press the "START ALL"-button
• Enjoy the ride...

Note: I haven't used this gang-programming mode myself, so above manual is all theory.

esptool.py at the command line could also help here ...