X10 Community Forum

🔌General Home Automation => Automating Your House => Troubleshooting Automation Problems => Topic started by: dapmanz on August 24, 2007, 11:02:07 AM

Title: zero crossing square wave
Post by: dapmanz on August 24, 2007, 11:02:07 AM

Hi,
My XM10E is not generating the correct zero crossing detect signal. When this signal was viewed from the oscilloscope, i obtained a signal with 20ms period ( i'm working on 50Hz) but the amplitude was 0.1V. Also, the shape was not square.
Dapmanz.

Title: Re: zero crossing square wave
Post by: Charles Sullivan on August 24, 2007, 12:04:27 PM

Quote from: dapmanz on August 24, 2007, 11:02:07 AM

Hi,
My XM10E is not generating the correct zero crossing detect signal. When this signal was viewed from the oscilloscope, i obtained a signal with 20ms period ( i'm working on 50Hz) but the amplitude was 0.1V. Also, the shape was not square.
Dapmanz.

According to the specs, this is an open collector circuit and you need a pullup resistor.  If you already have this in your circuitry, your XM10E is probably defective.

Title: Re: zero crossing square wave
Post by: dapmanz on August 29, 2007, 08:45:23 AM

Thanks Charles
I've modified my circuit with a 10k resistor. I obtained the expected 50Hz square wave.
Dapmanz