Hello All,

I can't seem to find the voltage for the LVTTL I/O's on the SnapAmp JP7 connector. I need three 5V outputs and was hoping I could use the first few pins for that.

Thanks in advance,
David.

Group: DynoMotion	Message: 7739	From: Tom Kerekes	Date: 6/22/2013
Subject: Re: SnapAmp Output Voltage

Hi David, Do you have any specs on what you need?  KFLOP/SnapAmp GPIO Outputs can sink to ground a a +5V signal. Regarding usage timer: we don't really have such a thing.  I suppose you could write some code to do that.  Some sort of odometer thing that updates a value in Flash Memory every so often?  Maybe accumulate time when things are moving and when they are still.  There is an example called FlashNonVolatile to save permanent data to an unused Flash Area.  A KFLOP C program can also write to a PC Disk file.  Or the Windows App could poll and write something to disk. Regards TK Group: DynoMotion Message: 7740 From: David Stevenson Date: 6/22/2013 Subject: Re: SnapAmp Output Voltage  Hi Tom,   I have three 5v relays that I was hoping to use to switch a stack light on and off. My plan was to send the 5v from the SnapAmp. Are you saying that I could control the grounding of the 5v using one of the GPIO's?   Thank you for your suggestions regarding the timer. I will try and piece together some code to accumulate the time. Any suggestions on what would be best to use for moving/still time determination?   Thanks again, David.     -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Tom Kerekes Sent: Saturday, June 22, 2013 2:11 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Hi David, Do you have any specs on what you need?  KFLOP/SnapAmp GPIO Outputs can sink to ground a a +5V signal. Regarding usage timer: we don't really have such a thing.  I suppose you could write some code to do that.  Some sort of odometer thing that updates a value in Flash Memory every so often?  Maybe accumulate time when things are moving and when they are still.  There is an example called FlashNonVolatile to save permanent data to an unused Flash Area.  A KFLOP C program can also write to a PC Disk file.  Or the Windows App could poll and write something to disk. Regards TK Group: DynoMotion Message: 7741 From: Tom Kerekes Date: 6/22/2013 Subject: Re: SnapAmp Output Voltage Hi David, Do you know how much current the relays require?  KFLOP GPIO can sink about 20ma.  BTW when ever using a relay coil put a reverse diode across the coil terminals so when switched off the current can recirculate through the diode and ramp down slowly rather than generating a huge voltage (spark).  You could check all the axes Destinations (ie ch0->Dest).  If they all don't change over a period of a minute then the machine is probably idle. Regards TK Group: DynoMotion Message: 7746 From: David Stevenson Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage  Hi Tom,   It looks like the coil is 87.0 mA (Omron G2R-1-S). Darn.   Thanks for the info regarding the reverse diode.   Best regards, David.   -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Tom Kerekes Sent: Saturday, June 22, 2013 4:26 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Hi David, Do you know how much current the relays require?  KFLOP GPIO can sink about 20ma.  BTW when ever using a relay coil put a reverse diode across the coil terminals so when switched off the current can recirculate through the diode and ramp down slowly rather than generating a huge voltage (spark).  You could check all the axes Destinations (ie ch0->Dest).  If they all don't change over a period of a minute then the machine is probably idle. Regards TK Group: DynoMotion Message: 7748 From: Tom Kerekes Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage Hi David, Here is a simple Relay Board from Winford.com that can be driven from KFLOP outputs: http://www.winford.com/products/rly104.php or you could add a FET (logic level) to increase the KFLOP drive current. or switch to 3V solid state relays. Regards TK Group: DynoMotion Message: 7749 From: David Stevenson Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage  Hi Tom,   It looks like the Winford board needs 5v input. I have been searching for a few hours now and it seems there are very few items which will reliably bump the voltage from 3.3 to 5v. The solid state relays all seem to be for output of 24v or more and with my limited electronics knowledge I really don't don't understand most of the lingo.   Thank you for your help, David.   -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Tom Kerekes Sent: Sunday, June 23, 2013 12:17 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Hi David, Here is a simple Relay Board from Winford.com that can be driven from KFLOP outputs: http://www.winford.com/products/rly104.php or you could add a FET (logic level) to increase the KFLOP drive current. or switch to 3V solid state relays. Regards TK Group: DynoMotion Message: 7750 From: Tom Kerekes Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage Hi David, No the Winford boards work fine with KFLOP.  You are correct that if you buy the 5V version of the board you must supply +5V to power the board.  But the input signals (coming from KFLOP) are only required to be higher than 2.7V to activate the relays. See the data sheet: http://www.winford.com/download/rly104_datasheet.pdf Regards TK Group: DynoMotion Message: 7751 From: David Stevenson Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage  Hi Tom,   I will give one of those a try. Do I need to worry about a reverse diode with their board?   Thank you, David.   -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Tom Kerekes Sent: Sunday, June 23, 2013 12:48 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Hi David, No the Winford boards work fine with KFLOP.  You are correct that if you buy the 5V version of the board you must supply +5V to power the board.  But the input signals (coming from KFLOP) are only required to be higher than 2.7V to activate the relays. See the data sheet: http://www.winford.com/download/rly104_datasheet.pdf Regards TK Group: DynoMotion Message: 7752 From: Vlad O Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage Look to U-max CNC board.  It has more and make KFlop safe ! On Sunday, June 23, 2013, Tom Kerekes wrote:   Hi David, Here is a simple Relay Board from Winford.com that can be driven from KFLOP outputs: http://www.winford.com/products/rly104.php or you could add a FET (logic level) to increase the KFLOP drive current. or switch to 3V solid state relays. Regards TK Group: DynoMotion Message: 7753 From: David Stevenson Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage I just ordered the Winford board 5 minutes ago!   David   -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Vlad O Sent: Sunday, June 23, 2013 1:07 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Look to U-max CNC board.  It has more and make KFlop safe ! On Sunday, June 23, 2013, Tom Kerekes wrote:   Hi David, Here is a simple Relay Board from Winford.com that can be driven from KFLOP outputs: http://www.winford.com/products/rly104.php or you could add a FET (logic level) to increase the KFLOP drive current. or switch to 3V solid state relays. Regards TK Group: DynoMotion Message: 7756 From: Tom Kerekes Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage Hi David, Yes.  Read their: Note About Inductive Loads in the data sheet. Here is my attempt at a electrical/mechanical analogy: Coil Inductance is similar to Mass (say of a Car) Applied voltage is similar to applied Force on the Car Current flow is similar to the speed (momentum) of the Car Coil Resistance is similar to friction of the Car So for example: We apply a positive force to the car which causes it to accelerate up to some speed.  After a while the road suddenly ends into a brick wall.  A huge negative force is generated (crash) onto the car to stop it instantly. this is similar to: We apply some positive voltage to a coil which ramps up the Current.  After a while we open the circuit which stops the current flow.  A huge negative voltage is generated (spark) to stop the current instantly, A better approach is to remove the positive force from the car but supply a path for it to coast to a stop gradually from its own friction.  This is what the reverse diode supplies.  A path for the current to recirculate and gradually reduce due to the coil resistance. Many circuits that drive coils only connect to one lead of the coil (the other goes directly to the power supply).  So it isn't possible to add the diode into the circuit. It just occurred to me you might be referring to the relay coil on the Winford Board.  That should already have a diode (or equivalent) across it and you don't need to worry about that coil.  Only if you add a relay of your own that has a coil. HTH Regards TK Group: DynoMotion Message: 7757 From: David Stevenson Date: 6/23/2013 Subject: Re: SnapAmp Output Voltage  Hi Tom,   Thank you for that explanation. It was helpful.   In my circuit I am needing to energize a 24VDC stack light. I had installed 5VDC / 24VDC relays (x3 for 3 lights) thinking the SnapAmp would supply 5VDC signals. If the Winford relay has diodes I guess I don't need to worry as I will pull the 5V/24V relays and use them for another project.   Thanks again, David.   -----Original Message----- From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]On Behalf Of Tom Kerekes Sent: Sunday, June 23, 2013 1:26 PM To: DynoMotion@yahoogroups.com Subject: Re: [DynoMotion] SnapAmp Output Voltage   Hi David, Yes.  Read their: Note About Inductive Loads in the data sheet. Here is my attempt at a electrical/mechanical analogy: Coil Inductance is similar to Mass (say of a Car) Applied voltage is similar to applied Force on the Car Current flow is similar to the speed (momentum) of the Car Coil Resistance is similar to friction of the Car So for example: We apply a positive force to the car which causes it to accelerate up to some speed.  After a while the road suddenly ends into a brick wall.  A huge negative force is generated (crash) onto the car to stop it instantly. this is similar to: We apply some positive voltage to a coil which ramps up the Current.  After a while we open the circuit which stops the current flow.  A huge negative voltage is generated (spark) to stop the current instantly, A better approach is to remove the positive force from the car but supply a path for it to coast to a stop gradually from its own friction.  This is what the reverse diode supplies.  A path for the current to recirculate and gradually reduce due to the coil resistance. Many circuits that drive coils only connect to one lead of the coil (the other goes directly to the power supply).  So it isn't possible to add the diode into the circuit. It just occurred to me you might be referring to the relay coil on the Winford Board.  That should already have a diode (or equivalent) across it and you don't need to worry about that coil.  Only if you add a relay of your own that has a coil. HTH Regards TK