91xr7
Junior Member
Posts: 51
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Post by 91xr7 on Aug 10, 2017 12:44:59 GMT -8
Hello all
Updated project. Have a car that has a sifter position indicator on the dash (P-R-N-D-2-1) that is controlled by a programmable module (Dakota digital GSS-2000 for those playing at home) with an input range via a 10K potentiometer of 0 – 5 volts, going by their tech the range should be 2-8Kohm (has a Short to ground/positive fault indication)
Now the car in question is being converted to electric so it’ll just be a single speed gear box to the most part, but we’ll have a switch that will select R-N-D (basically an ON-OFF-ON based switch) that has two sets of contacts inside it. One will be at 12Vs and will tell the motor controller which way to go, the other set will be for the 5 volt signals for the display indicator. But being there is no contact in the center (off / Neutral) position wondering how to get that to be done? (and needs to shut off when in drive/reverse) I can make say a Variable voltage divider with like X number of resistors (also the display needs to be programed for Part, 2nd and 1st going by the tech guy) having the signal that goes to the module say after the second resistor (Say a 2K plus a 1K) from the ground end, and then have the remaining resistor after that. Was thinking of using say an NAND gate for the neutral (IE when both inputs are 0 output will be 1, but seems like if either inputs are still 1, output will stay 1?)) I could use say two diodes and a relay that has a NC position to release the power to the resistor point for “neutral” but rather try and do a “solid state” or more “jelly bean” approach to this
Just starting a brain storming event here will add more information later?
Thanks Kevin
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Post by lamazoid on Aug 12, 2017 3:04:54 GMT -8
personally, i understand nothing from your description ((((
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91xr7
Junior Member
Posts: 51
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Post by 91xr7 on Aug 13, 2017 13:59:13 GMT -8
personally, i understand nothing from your description (((( Trying to figure out how to explain it better, really. I just need a range of 1 to 4 volts to the display controller to be able indicate what position the shifter is in. Now I will need to have access of all positions as stated above for programming reason (can't leave them out) but only really need R(reverse)-N(neutral)-D(drive) which will need to be selected by a DPDT switch that has a middle off position (ON-OFF-ON) I was thinking a 7 resistor array and someone how tapping off of it for the correct voltages to tell the display, but don't know how to get neutral to work! I'm also thinking a relay and two diodes that will switch the relay from NC to NC may work, but rather not have a mechanical relay. Was thinking of a CD4001 but can't figure how that'll work, even with a transistor on the output? Kevin
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Post by lamazoid on Aug 15, 2017 0:19:06 GMT -8
personally, i understand nothing from your description (((( Trying to figure out how to explain it better, really. I just need a range of 1 to 4 volts to the display controller to be able indicate what position the shifter is in. Now I will need to have access of all positions as stated above for programming reason (can't leave them out) but only really need R(reverse)-N(neutral)-D(drive) which will need to be selected by a DPDT switch that has a middle off position (ON-OFF-ON) I was thinking a 7 resistor array and someone how tapping off of it for the correct voltages to tell the display, but don't know how to get neutral to work! I'm also thinking a relay and two diodes that will switch the relay from NC to NC may work, but rather not have a mechanical relay. Was thinking of a CD4001 but can't figure how that'll work, even with a transistor on the output? Kevin so, you have some kind of device, a "display controller" as you call it, which accepts analog voltages from 1 to 4 volts ? (is that correct?) then, depending on input voltage, this device shows you R-N-D-2-1 ? (right?) then, you have a switch on each gear, which you want to connect to resistor of certain value to make a voltage divider of certain voltage, and then apply that to the "display controller" ? if i understand correctly, i can't figure out what's your problem with "N" ? isn't that just another switch connected to just another resistor to make "display" show it ? also, what exactly that "display controller" is? do you have any documentation?
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Post by lamazoid on Aug 15, 2017 5:28:18 GMT -8
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91xr7
Junior Member
Posts: 51
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Post by 91xr7 on Aug 17, 2017 20:12:51 GMT -8
Yes that is the device as i stated in the first post.
the device in question uses a couple of arms connected to the shifter and a 10K Pot to indicate (after programing) which gear you are in.
The issue is the car is being converted to electric, and the automatic trans has been removed and has been replaced by a 2-speed manual trans (two forward gears) and we'll be using a Rotary 3 position switch (on-off-on) for drive selection, forward and reverse, which is easy to get the display to display D for Forward, and R for Reverse, but since there is no contacts on the switch in the middle position to enable Neutral on the display, it needs to be figured out a different way.
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Post by lamazoid on Aug 17, 2017 22:45:01 GMT -8
Yes that is the device as i stated in the first post. the device in question uses a couple of arms connected to the shifter and a 10K Pot to indicate (after programing) which gear you are in. The issue is the car is being converted to electric, and the automatic trans has been removed and has been replaced by a 2-speed manual trans (two forward gears) and we'll be using a Rotary 3 position switch (on-off-on) for drive selection, forward and reverse, which is easy to get the display to display D for Forward, and R for Reverse, but since there is no contacts on the switch in the middle position to enable Neutral on the display, it needs to be figured out a different way. now i got it. can you provide a description of that switch ? (datasheet maybe)
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91xr7
Junior Member
Posts: 51
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Post by 91xr7 on Oct 1, 2017 15:37:51 GMT -8
Sorry for the delay, as always with me,
Thank you for trying to help me out on this, but went a different way with this for the fact i was under the gun so to speak to get it up and running.
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