Wemos DHT22 and Button

2 more I/O shields: Temperature and humity sensor (DHT22 AKA AM2302) and here the super-simple example:

print(dht.read(4))
0 26 1 800 0

That’s 26.8 °C and 1.0% humidity. I somehow don’t trust the humidity…

And here the push button module example, which shows well how much the contact bounce is:

do
 local pin=3
 gpio.mode(pin, gpio.INT, gpio.PULLUP)
 local pulse1=0

 local function pushed(level)
 local pulse2 = tmr.now()
 print("Level: ", level, "since last change: ", pulse2-pulse1, " ns")
 pulse1=pulse2
 end
 
 gpio.trig(pin, "down", pushed)
end