I’m preparing to add an ADU5 to my very much NOT modern vehicle. In doing so, I’ll lose a few indicator lights that I have yet to replace with sensors. High beams, turn indicator, oil pressure and alternator. I’m wondering what the process needs to look like to connect inputs on the dash to display the info from these different indicators?
Alternator, I’ll just setup and logic channel watching battery voltage, so not very worried about that one.
Oil pressure is a switch that provides a ground when there is no oil pressure.
Turn signals and high beams are a 12v signal.
Can I connect all of these to digital inputs? I believe the oil pressure can be setup as an active low, would the turn signal and high beams be set as active high? Will 12v being fed to those inputs be a problem?
Thanks!
Yes, you have to enable the pull-up resistor and set the input as active low.
If the switch is open, the input will be sitting at 5 V, and with the switch closed, the voltage will be 0.
As already detailed, all of the functions you want to include are easy to setup.
I have both direction indicators, headlamp side lights as well as Main beam (all +12v). And for the battery, I have a live voltage display as well as an alarm for low battery voltage which essentially functions as a ‘clever’ version of a standard alternator charging lamp.
I’m utilising an oil pressure ‘sensor’ and this has the added benefit of being able to display the live oil pressure as well as operate like an oil pressure ‘switch’ and display an alarm and/or display indicator lamp when pressure is low.
With this dash there are numerous ways in which you can achieve visual display of the same parameter, it offers great flexibility.
I have gotten everything I want from the dash at this point, with one exception. I cannot get it to indicate that my turn signals are active. I’ve tried every combo of wiring I can think of. I’ve connected to the L on the relay, this caused a constant clicking of the relay but nothing on the dash, added an input and swapped to wires going directly to the turn signal bulbs, no response on the dash, and now changed to a flasher with a dedicated P pin for controlling a dash light and still, I get nothing on the dash. I’ve tried active high and low, with and without a pull up on every wiring combo. I’ve got other indicators lights working just fine for oil pressure and my high beams, but these turn signals seem to have gotten the best of me. Has anyone successfully cracked turn signals? This is the last thing I needed to wrap up this install.
When the input is set to active high, the indicator on the dash lights up, when set to low, it turns off, regardless of the position of the turn indicator switch. I’ve attached the project file. The inputs in question are named Right and Left Turn.
I also had a different flasher in the car that didn’t have the p terminal and I just T’d off the L for the stock indicator light. I also tried using two digital inputs and connecting those to the wires going to the turn signal lights after the switch. That arrangement delivered nothing better.
If it doesn’t work with that combination, something in ur wiring must be strange…or the system is kind of special.
But in ur wiring are missing informations….who is generating the on/off clicks?
Is this relay just a simple common relay? But then how is determined which side is flashing?
is generating the clicks…2/75 is a permanent power supply and if on 3/49a a load is connected it starts to cycle. Means the indication cant be connected to “anywhere”.
But if ur ADU input is connected directly in front of the bulb…so between turn switch and the bulb…it must work.
The relay I have is just a common turn signal flasher relay. It it the box connected to the 12v supply. The P terminal on the relay is a dedicated indicator light circuit. I need to put a test light on it to see what it is outputting. A meter doesn’t read fast enough to determine what is actually going on. This is a 65 year old car with very very simple wiring. Thus my confusion with the inability to make this work. There is nothing to it, yet my results are not what I’m looking for.
What i just wanted to say…i dont know how this P terminal is working, but in any case it doesnt make sense for me to connect the ADU input to it cause in any case u cant dtermin there if it is left or right.
Connect the ADU between the bulb and the turn switch and use my settings. Then it has to work.
This car never told direction before, just that the turns were active. So the p terminal delivers that, and only chews up one input on the adu.
I have already tried exactly what you described, pulling power directly from the wire going to each light, and still got nothing. I’ll mess with it some more later today. I might have issues with good grounding to those front bulbs. Maybe that is what is causing our problems.
Digital input can’t be floating without a pull-up resistor.
That means there must be either ground or some voltage above threshold to switch back and forth. The relay output is at the supply voltage or floating, not connected to anything.
Add an external pull-down resistor (1- 10k) to the digital input. It should fix everything.
There might be something else going on.
In that case, I would get an oscilloscope/multimeter and start measuring.
Or even connect it to an analog input instead of a digital one and look at the voltage.
Connecting the P output on the relay to the adu with the pulldown got me what I needed! I may have some grounding issues with the bulb circuits. They light up, but occasionally give me fits, and could probably use a better grounding strategy. This current solution is acceptable thouigh. Thank you all for your help!
