The simple circuit ... Low and Q1 (Pin 2) goes High (Relay ON). On the rising edge of the second clock pulse, Q1 goes Low and Q2 (Pin 4) goes High. As configured here, a High output from Q2 resets the ...

An Arduino Uno (CH340G clone) reads temperature and humidity from a DHT11 sensor and computes 10+ environmental metrics (heat index, dew point, enthalpy, humidex, vapor pressures, etc.), outputting ...