Dual counter problem

[thakari]

Hi

I'm running a 1-wire network with two temperature sensors and a dual counter. Connected to the dual counter is a standard kWh meter with S0 pulse output and a reflection detector - a small board with a led and a phototransistor to indicate reflection. There's no additional power, just the USB interface.

Basically the system works fine. The only problem is that the dual counter is counting extra hits from the kWh meter. When there is no pulses the counter doesn't increase. But when I compare the counter value to the kWh meter's own display within some period of time there is a big difference. What could cause this?

Could it be a power problem? How do I easiest add an extra power source to the system? +5 V from an AC adaptor or USB to the +5 and GND of the dual counter?

I also noticed that when the counter is read, the output power drops temporarily which sometimes causes one extra hit from the reflection detector. Adding extra power would propably fix this, too, but how shall I do it?


Regards,

Tomi

 

[skyewright]

...The only problem is that the dual counter is counting extra hits from the kWh meter. When there is no pulses the counter doesn't increase. But when I compare the counter value to the kWh meter's own display within some period of time there is a big difference.

My situation was very different (big over counts with an anemometer at the top of a 33' mast and around 40' of wire between the reed switch in the anemometer and the counter in my 1-wire box) but the solution for me was a simple resistor-capacitor low pass filter, as mentioned in this topic.

If you have the relevant bits it would probably be an easy thing to try out?

David

 

[ericvic]

Tomi,

David's suggestion if a good one for the over counting. If you want to add external power then just connect regulated 5vdc to the GND and +5v screw terminals.

Eric

 

[thakari]

Thanks David and Eric for the replies!

I doubt that it would be a low-pass-filtering issue as the problem is not with mechanical or reed switches. I'll try first adding some power and let you know if it helped.


Tomi