How many binary sensors can a Wemos D1 Mini handle?

Configuration
8

i’m just a newbie. but hopefully i might help a bit. in my device configuration this is what i did:
D1 = Switch2
D2 = Switch3
D3 = Switch4
Capture
then in the Device Console i typed:
SwitchTopic2 MainDoor (or whatever you want to name it)
SwitchTopic3 MainGate
SwitchTopic4 GateStairs
so whenever D3 is triggered, the MQTT message i get is:
cmnd/GateStairs/Power - ON

this might not be the best solution but it works for me.

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