user80288

Most recent activity

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  The blue line gets disconnected so that wouldn't help the serial ground.

  Could the serial ground not be connected to the external power supply as well?

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  I do have the ground on the puck connected to the ground on the sim800's power supply, something like this:

  

  Shouldn't that prevent a difference in ground level?

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  Thanks

  but why is switching ground in this case a problem, others have used Mosfets to switch higher voltages haven't they?

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  how could i prevent that? Guess that is what is happening.

  I have to turn off the serial device (sim800), it then remains connected with Tx, Rx and GND.

  I am switching the GSM on and off through a mosfet and a signal wire. The puck has to share the GND with the GSM gnd going to the mosfet's Source pin right.

  But I think the messy contact alarm happens even without using the mosfet switching

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  any problem with using D27, which is also the capacitance measuring pin?

• Any reason why a serial connection might interfere with a setWatch for a contact on other ports?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 8 months

  

  i am using a mosfet to switch something on and off. But as soon as the signal wire is connected, the contact setWatch becomes unreliable.

  The mosfet connects with the signal wire and ground to the Puck. That ground is also connected to the source of the separate battery running the peripheral.

  Does that mess up what is ground to the puck somehow?