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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 [...] This is the CurrentCost development board. Note the 10 pin programming header – the leftmost pins are at 0V the rightmost at the positive supply voltage. I have attached a wire to the anode of the led. This is my gas meter – there is a cut out at the bottom right of the [...] @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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