1971 Nova Parking Brake

Support Motor controllers/drivers and motors
1

Hi, I have a 1971 Nova and I am trying to use a small actuator to set and release the parking brake by using a button on the dash. I am a computer guy, but this is my first time playing with a motor controller. So please be kind. I am trying to do this with the JrK G2 18V27 controller. My plan was to have a momentary contact switch mounted in the dash. Press the switch up and the actuator retracts, pulling on the brake cables. When you push the button down the actuator extends and releases the parking brake. I like the idea of a quick momentary press of the button to cause a change to happen.

In the car I have a Dakota Digital Dash that has an indicator light for the parking brake. The light is activated by a ground signal. I think the AUX port is 5V. I was trying to use the relay module to provide a switched ground. I couldn’t figure that out at all. I thought I would be able to configure and control the AUX port from the software but figured out I can’t.

If I mess around with the software settings, I can get the actuator to extend and retract. It just won’t latch and dash indicator does not work. In other words, release the button and actuator extends. I am thinking that I need to figure out how to wire in the DPST latching relay linked below

DPDT latching relay - Yctze DPDT Relay Module Double Pole Double Throw Self Locking Bistable Relay Board for ESP, 12V, 5V Single Pole, 4V to 6V, Latching Relay (DC6-24V) : Amazon.ca: Tools & Home Improvement
Relay module - Yctze DPDT Relay Module Double Pole Double Throw Self Locking Bistable Relay Board for ESP, 12V, 5V Single Pole, 4V to 6V, Latching Relay (DC6-24V) : Amazon.ca: Tools & Home Improvement
Switch momentary rocker DPDT - HYY Momentary ON Off ON Rocker Switch Control DPDT DC 12V or 24V : Amazon.ca: Sports & Outdoors
Actuator - HYY Momentary ON Off ON Rocker Switch Control DPDT DC 12V or 24V : Amazon.ca: Sports & Outdoors

Electric Parking Brake Wiring - Jrk G2 board.pdf (276.9 KB)

Thanks for any help you can provide
Chris

2

Hello, Chris.

It is not entirely clear to me what the scope of your project is, but please note that we do not recommend our products for applications where failure could result in injury or significant property damage. Additionally, if you are new to electronics, I recommend finding someone more experienced who can help you (possibly from a makerspace, robotics meetup, or nearby university group).

The rocker switch you linked to is momentary, so you will need to hold it for as long as you want the signal to be present. It sounds like you want to be able to just press it briefly and have it latch, in which case you might consider just using a SPST latching switch like this one instead.

The AUX pin on the Jrk is not a controllable user output (its intended use is to power resistive devices like potentiometers). I am not familiar with the Dakota Digital Dash, but if it just needs a ground signal to activate the light, you might be able to just tie it into the SDA/AN signal (depending on how you set it up).

Brandon

3

Thank you Brandon for taking the time to reply.

I had come to the same conclusion that I needed either a latching switch or use a latching relay.
Thank you for the suggestion of using the SDA/AN to signal the brake set dash light.

Enjoy your weekend.
Chris

6

The Jrk does not have a setting to “remember the last position”, so it cannot use a momentary pushbutton as a latching input. Additionally, I am not sure what you are suggesting with the AUX pin (it is a 5V output that periodically gets pulled to ground for the automatic disconnect detection when using a potentiometer). Could you elaborate on what you are suggesting?

-Brandon

7

Sorry. It looks like I misunderstood the whole thing. Thank you for pointing out.