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When the switch opens the falling edge will cause a negative pulse on the 4013 input. The diode removes that negative pulse. Input to 4013 without diode –one pulse (on/off) –zero volts is the centre line. The signal goes negative to minus 1.44 volts. Positive pulse comes from direct connection to +3 volts,[...] Here is the final circuit I will use,the resistor and capacitor values give a time constant of about 0.5 sec –I’m sure many other values would work but I have these ones in my box. I have added a pull down resistor on the reset line just to make sure it is low [...] @MartinDix from CurrentCost kindly sent me a dev board so I could interface other feeds to the CurrentCost meter. After some experimentation this is the circuit I intend to use. I have not yet fully finalised values of components but it seems to work pretty well on the breadboard. Note my dev board is version [...] |       | |||||
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