Lockable Drawers for Rivians
Oct 20 @ 9:44pm
I wanted to document the pin outs for the Rivian camp speaker/accessory drawer pinouts and function. My end goal is get some powered stuff in that space and open it up for third party designs.
For those that are not familiar, The Rivian R1T and R1S come with a "camp speaker", which is a Bluetooth speaker that docks into the center console. I really have not found much documentation or other details on the camp speaker dock. That dock has three pogo pins. The camp speaker has three contact pads that mate with it.
So I did some testing, using the picture of my PCB, I've labeled the pins, looking at the camp speaker side. There is a 12V power pin, a sense pin, and a ground pin. The way it works is the sense pin has an internal pullup resistor to the 12V rail. You pull this down to ground with a resistor to set the drawer function. My testing has identified that a 1k pull-down will make it show as an accessory drawer in the UI and a 2.4k resistor will make it show as a camp speaker. If there is no pull down resistor then it shows nothing there.
Locking requires a pull down resistor, when detected, the locking function seems to function, in both accessory drawer and camp speaker mode.
When in accessory drawer mode, ther 12V power is disabled.
When in camp speaker mode, power is available via the 12V power rail. My testing has identified that the camp speaker pulls 1.5A to charge. The circuit is fused at 5A, and shares with some other components including the torch. I suspect the pogo pins are probably good for 2A, not much more.
The 3D printed drawer
I've designed a 3D printable drawer to prove out the design and be a stepping off point for other designs. I'm open to any updates or comments people find. I've posted the 3D model on printables along with the Gerbers for the PCB.
I have a bunch of PCBs assembled that I can sell ($5 + $5 shipping) for the accessory drawer mode. If anyone would like to experiment with powered usage, I have the same board in a powered configuration ($10 + $5 shipping), with a connector and compatible cable to provide power. The current design of these is power over 2 pairs of wire, which should be good for 1A per pair, or 2A per shared pair (hopefully, haven't really tested it)
This is the powered one with connector and cable:
The powered PCB includes a 4A PTC fuse, which [with some luck] will prevent you from blowing the vehicle fuse and can be reset just by pulling the drawer out for a minute to reset.
Edit: An eariler version of this stated that it was a 3.3k resistor for the camp speaker mode, this was incorrect, 3.3k appears to work on gen1 but not gen2, I assume gen1 has a wider tolerance than gen2. The correct value is 2.4k
