ESP8266 Community Forum

Matt2689 wrote:So any recommendations? I'm thinking of using opto isolators to bridge across the buttons rather than relays...

I think that's up to you, really. A specialist forum on roomba, or an electronics forum might be a more productive forum to ask, as few people here will know the power requirements of a roomaba.

AFAIK, the GPIO pins on the ESP8266 are designed to source up to about 10 mA each, with a total of about 60mA. These are approximate figures, drawn from my memory, so they may be wrong. But I think they are ball-park correct. Any opto-isolator circuit attached would be of your own design, I imagine.

I assume that's what you're asking...

Also it is possible to control a Roomba via serial interface. So you could use a esp module to receive web commands and send them into Roomba serial interface.

See for example
https://hackaday.io/project/8290-esp8266-controlled-roomba

or

https://github.com/incmve/roomba-esp8266