jayknow05

We are designing several RF devices that will be attached using the same in-line connector to a common processing unit. We would like to determine the type of device (out of 8) that is attached through some sort of hardware identification. Simplicity and passive electronics are preferred since this will be put into a hot environment, and must remain reliable through customer abuse.

My question is, how would you do it?

My current answers are:

Sense resistor in the cable.

This is a straightforward solution requiring only 1 additional connector pin, but would require some way to read the voltage. There is no need for an ADC in this application so additional hardware or a processin

I have a 2000 Toyota Corolla that is throwing a P0171 code. There is poor throttle response at full throttle from a stop, but it has good throttle response at highway speeds or for moderate throttle inputs. I've done the following:

• Checked MAF voltage which changes with throttle position, I think this is normal.

• Cleaned MAF with MAF cleaner anyways.

• Checked O2 sensor heater is getting power, resistance is ~14ohms.

• Checked O2 sensor DC voltage when running, ~900mV

• Smoke tested and located a vacuum leak around the air box due to an improperly installed air filter. Replaced air filter and verified leak is gone.

• Pulled 2 of the 4 spark plugs and they look normal.

I would like

I have no experience screen printing, but I have some lettering I'd like to print on some boards. The lettering is a single color, white, ~60" long and it is going on a stained piece of pine.

My question is, what is the best way to do this? I can build a rig to hold the board and screen(s), how do I make or where do I buy a screen that is 60" long? Is it better to split it into a few separate prints?

I have a dragging caliper that needs to be replaced, so I'm replaced the rear calipers, pads and rotors. I have done brakes before and removing the caliper seems like an easy extension of that.

After I complete this job I will be flushing the brake fluid. I can get a pressure bleeder and do it myself, but I have heard the BMW has some automatic method that a BMW shop uses that may or may not be better. My question is, is it worth paying ~$100 to have the shop flush the system in the official way or will the end result be the same thing I can do in my driveway?

If I decide to get it done at the shop, I'll finish the job and bleed the brakes without a flush and bring it in at my leisure.

I am using a least squares fit of two input signals of a known frequency to determine phase shift. The frequency has a +/- 10Hz error so as well as fitting for phase, I do another iteration to fit for the exact frequency.

My question is, is this the most accurate way to go about this? Is there another method that is just as accurate and more efficient? Currently the algorithm is implemented in Matlab, but eventually it will need to be an embedded solution.

Both guys had a disappointing week 1, but Wilson plays for the better team. I think I can convince the guy with Wilson to trade for Miller because he's really down on him for obvious reasons.

I would limit the rate at which your bot posts somehow, like only posting to comments above a certain threshold. Currently it's spamming indiscriminately. Although you may think it's a valiant cause, the fact that you've been banned in many subreddits proves that there are people who don't agree with you. It's not because people don't think metric is something important to understand, it's just that some people know that 2.54cm = 1in and 60mph is about 100kph and prefer not to be reminded about it each time they post.

I am going to make a shield with the new CC3000 WiFi chip from TI. Just trying to gauge interest to see if anybody would be willing to buy one when it's finished. The increased cost to go from 2-3 boards to 20 or so is relatively low so I may as well if enough people want one.

Edit: Lots of great feedback! Looks like I will be doing a Tindie fundraiser in the near future. The chips aren't commercially available yet, but I'll report back when I have a better timeline, I've heard reports of Q1. There will definitely be a Reddit coupon so I'll be sure to let you know! Stay tuned.

If you're looking for a chance to pick up a quality hammock for free, check out this giveaway by Appalachian Hammock. Only going for the next 24 hours. Made by my buddy and his brother. Small company and their stuff is all handmade right here in the USA.

You have to sign up here on their Facebook page: http://a.pgtb.me/JfDhzs

If you have any questions about the hammocks I'm going to have him come here and field them...

I'm designing a system for servo control, but I'm worried about safety. The servo will be controlling the throttle on an engine so a runaway condition is unacceptable. What do people do to guard against this without using expensive industrial systems? I'm using a hobby servo and an Arduino...

EDIT: I've decided to augment the mechanical throttle rather than go completely fly-by-wire based on the advice here. It would be cost prohibitive to design a completely safe fbw system that is safe.