How does watch work ?

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MaBe

What about using a different pin to verify.

connect D3 with D4 and send some pulse:

setTimeout(initWP,1E3);
setTimeout(()=>{
      digitalPulse(D4,0,[100,100,100,100,100,100,100,100]);
},2E3);

Output should look like this:

new Uint8Array([0, 1, 0, 1, 0, 1, 0, 1, 0])

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