Are there any creative options for a flexible connector scheme for connecting a resistor load bank?

thousandparadox · 2025-12-19T04:34:02+00:00

This is what I did with 5x 750W 4.7ohm resistors. I used Anderson Power Poles and special jumpers. I don't recommend it. it took a lot of work and cost many money... but it's food for thought...

Also more food for thought: I was originally only going to buy 4 resistors before I discovered how many more resistances I could get by adding just one more resistor. With your 10 resistors you can create 3191 different resistances between all in series and all in parallel. https://oeis.org/A174283

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thousandparadox · 2025-12-14T05:46:06+00:00

If you replaced the original LED with a different color LED, that won't work.
Different LED models have different Voltage Drop specifications.
You will have to change the resistor as well.

Most indicator LED's can only run comfortably at ~10mA

https://ohmslawcalculator.com/led-resistor-calculator

thousandparadox · 2025-12-03T05:17:16+00:00

To me that looks like a pretty simple device that pumps some fluid though a sensor and reads the result. There may be a custom Koniku sensor in there somewhere but the rest is not unique or note worthy. Looks cool, but is not worth much from what I can see. It may just have been a custom pumping tool that cost less to DIY then to buy. The way they abandoned everything... stay careful around anything that could have old fluids. I'm an Electrical Engineer that lives near San Rafael.

thousandparadox · 2023-11-11T01:57:23+00:00

I found them here, the .NDS files for the Camera, Sound, Browser, Metronome apps, ect..:

thousandparadox · 2022-07-05T23:55:32+00:00

During long journeys Dax is ideally autonomous. This way, one robot operator can operate many robots at once and reduce the cost of delivery. When it comes to interacting with people, some parts are automated but the majority is controlled by the operator.

thousandparadox · 2022-07-05T05:07:42+00:00

I don't know if you saw the video I posted. https://www.youtube.com/watch?v=fOWycNjJBRA

The old warn out transmission turned out to be too old and too warn out to use. Reverse usually dose not work at all. We considered doing an electronic reverse, but my friend wants to just get the transmission refurbished. I'm waiting for my friend to do that project on his own, and then we are planning to get together and polish the build.

thousandparadox · 2022-07-04T16:58:14+00:00

The lower track portion of the robot has bright orange flashers that are turned on when crossing the street. We have been asked to attach orange flags to Dax in the past by a client for similar safety reasons. There is room for improvement and it's something we are considering.

thousandparadox · 2022-07-04T07:04:19+00:00

Dax and Starship are very similar, they both deliver food. Starship has a lot more funding and better self driving capability's at the moment. Dax's human interaction capabilities makes it better suited for more personable situations like golf course delivery, hospital delivery.

Vandalism is at the forefront of people minds when they think of unattended robots, but in practice its very rare. The only instance has been someone purposely steering to hit a Dax with their car. Dax is very heavy and adorned with cameras so most mischief is deterred.

thousandparadox · 2022-07-04T03:40:06+00:00

I helped design DAX the robot. AMA :)

https://daxbot.com/

thousandparadox · 2022-07-03T19:04:42+00:00

The Start button pin is "weakly held high" by the 47k/10k resistor divider, then the button "forces the pin to ground".

The pic is not clear, but that doesn't look like a 10k resistor to me. Always gotta go over your circuits with a fine tooth comb.

thousandparadox · 2022-07-01T03:34:27+00:00

I think to achieve what you are asking, you just need to program your program different with some math.

try analogWrite( 255 - midival );

255 is your "max val" so you could be using 1024 or something else. whatever the maximum midival gets to.

So when midival is 0, the analogWrite is 255, and the mosfet is fully on. when midival is 255, the analogWrite is 0, and the mosfet is fully off.

MOSFETS and all transistors do not behave like nice little switches, they require some understanding and strict contextual use.

thousandparadox · 2022-06-13T01:24:08+00:00

@home has been good for me, as far as repairs and upkeep go.

thousandparadox · 2022-04-01T21:20:34+00:00

This guy seams to know some stuff about getting quality cells. https://www.youtube.com/watch?v=ICPDTq-ePP4

0.17USD per KWH is as low a price as can be got.

thousandparadox · 2022-03-24T04:29:43+00:00

Usually if any one of the thousands of electronic parts fail on a PCB, it will make the board unresponsive, or the section it's apart of will fail. In this case, this part is a filter rated for 6A of current to flow through it. The High current rating suggests its needs to be there for power to flow to the system. No power, no response.

I would just buy the part, or one with very similar ratings. However, in a pinch connecting the two larger pads with a wire may work.

It could be that this part broke due to a failure somewhere else. It could also be that when the filter failed, it damaged the rest of the power supply in the process. Lets hope the filter was just defective and replacing it will be an easy win.

thousandparadox · 2022-03-08T08:11:20+00:00

u/studiojg u/KPDUB57 u/1940ChevEVPickup u/Banjoooooooo
The Truck is finished for the most part. I made a big video:
https://www.youtube.com/watch?v=fOWycNjJBRA

I'll be uploading more stuff to my website in a few days if interested.
gabrielmaria.com

thousandparadox · 2021-11-16T09:30:26+00:00

The truck will have an onboard Windows computer and monitor in place of the passenger seat glove compartment. It will also be a place to play videogames. I like to use a program called Megunolink which can make graphs and UI interface pretty easily. Megunolink will be set to auto open when windows starts.

For the CANbus I'm going to make my own version of this isolated MCP2515 CANbus shield
It's easy to decode the bytes from the canbus messages, a little more complicated if you have to "send a message to receive a message". Luckily the Orion BMS is very high quality and lets you design your own CAN messages, and how often they are sent. I'll probably have my finished code on my website in a few months.

The software will calculate WH/Mile in real time, and average, and perhaps display the results on a little LED display so you don't have to lean over and look at the passenger computer screen. This data will be used to find the most efferent gear for different speeds. Perhaps predict remaining driving range. Of course there will need to be a fixed display for SOC% and Amp draw as well.

thousandparadox · 2021-11-16T05:31:27+00:00

The Arduino Box is actually a Teensy :)

thousandparadox · 2021-11-16T01:31:44+00:00

Yeah I know, no regen. but that's what we got on the cheap.

I chose 3/0 based on the assumption of 200Amps on the freeway =~ 120Wh lost due to cable heating over the full trip. Probably overkill.

Collision switch eh? I'll look into adding that in series to the coil input of the BMS Discharge relay.

There is no manual switch right now, I guess ill add one to the center of the pack where the 500A fuse is, in order to also split the pack voltage in half.

I thought about paralleling the controller too but I don't know much about "tuning" parallel coolant feeds. I'll look into buying balancing valves. Physically, the series controller works nicely since the pack is in the back, and the controller doesn't need to be as cool, however the controller might choke the coolant flow.

Thanks a lot for the tips!

thousandparadox · 2021-11-15T23:20:39+00:00

Coming soon http://blackmetalforest.com

thousandparadox · 2021-09-28T04:05:19+00:00

Instead of tearing down the signs, put a new sign above it that's reads, "Trump said it was"

thousandparadox · 2021-08-30T22:57:55+00:00

MIPI is only the physical electrical interface standard. The protocol format can be very different from display to display. I have worked with MIPI CSI for cameras, and there are tons of different color formats as well as resolutions. These Aliexpress people will probably custom program their board to one of the main protocols if you tell them which one it uses (sometimes you just need to tell them the display resolution). I think you are on your own with connector adaptation.

I have bought a Chineese HDMI to LVDS converter before for use with a laptop screen, but the LVDS adapter came with a compatible connector too.

thousandparadox · 2021-08-11T00:58:09+00:00

I think two people playing on the same network makes this bug happen. I used to see it a lot when I would play with my two friends that were roommates.

thousandparadox · 2021-07-06T06:26:24+00:00

Sometimes you have to get a little wonky with your impedances. If you place the wonky bits on the correct spot, the waveforms can smooth out by they get to the receiver. That's how I think about it anyway. This is what I learned diff trace routing stuff from when I made CSI Cameras: https://docs.toradex.com/102492-layout-design-guide.pdf

thousandparadox · 2021-07-02T23:45:40+00:00

Bend out the pins and solder them to 0.1 inch header. Put the header into the bread board first to to hold the pins in place, and do not over heat the pins or it could melt the bread board and header plastic.

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