Re: [beagleboard] GPIO AINx output fluctuations

2014-12-22 Thread mab . mobile . 01
Have it on AGND On Thursday, December 18, 2014 6:46:41 PM UTC-6, cmbaker3 wrote: Analog or digital ground? The two are different. The digital ground will appear to float since the two are not connected. AGND is at P9-34, whereas GND is P9-1, P9-2, P9-43-46 and P8-1, P8-2. Chad On

[beagleboard] GPIO AINx output fluctuations

2014-12-18 Thread mab . mobile . 01
Hello, I am trying use the Beaglebone Black to monitor a smoke detector activation. I have two wires coming from the smoke detector, ground and positive lead. The voltage on the wires will go to 0.6v when the detector is activated. I have the ground connected to the P9 header GNDA_ADC and the

Re: [beagleboard] GPIO AINx output fluctuations

2014-12-18 Thread Chad Baker
Analog or digital ground? The two are different. The digital ground will appear to float since the two are not connected. AGND is at P9-34, whereas GND is P9-1, P9-2, P9-43-46 and P8-1, P8-2. Chad On 12/18/2014 11:44 AM, mab.mobile...@gmail.com wrote: Hello, I am trying use the Beaglebone

Re: [beagleboard] GPIO AINx output fluctuations

2014-12-18 Thread evilwulfie
normally your agnd will be connected to your dgnd in one place so both are at the same potential. On 12/18/2014 5:45 PM, Chad Baker wrote: Analog or digital ground? The two are different. The digital ground will appear to float since the two are not connected. AGND is at P9-34, whereas GND is