Search found 91 matches

by foxmiles
Mon Jul 16, 2012 11:46 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

Perhaps this would work better? As much as I hate wasting cycles this may help. It makes smaller changes and adds a 50ms delay to big changes and a 100ms delay to small changes. There will be a "ringing" with this, but it should (we want it to, idk if it will) stabilize fairly quickly. You could do ...
by foxmiles
Mon Jul 16, 2012 9:08 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

I think I know the problem. I had a 10 point sweet spot in the hill climbing function. I suggest changing: sp+5 to sp+1 and sp-5 to sp-1 maybe try something like: int hill(int av, int sp, int out) { //if the desired value is over 125 points high correct by dropping output value by 20 points if (av >...
by foxmiles
Thu Jul 05, 2012 8:25 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

Messed around with some code last night. I integrated analog input averaging and a hill climbing function for output with the analoginoutserial example. I'm sure there are better ways to do this, but here's what I came up with. /* Modifed to demonstrate a simple averaging and hill climbing control f...
by foxmiles
Wed Jul 04, 2012 6:19 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

Very cool. Now you just need to write the code so the pot sets the desired temperature, maps the temp to the analog value, monitors the thermocouple and adjusts the pwm to maintain that value. Actually not that hard at all. I said ladder climbing algorithm earlier. I meant hill climbing. here is an ...
by foxmiles
Mon Jun 25, 2012 7:24 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

A quick and dirty way to get going would be to have the arduino do a serial print of the temperature value. Then you can see what the things doing without messing with lcd's. EDIT: read the temp with an infrared thermometer for a rough measurement. Capton tape a glass thermisitor to it for a more ac...
by foxmiles
Fri Jun 15, 2012 11:39 pm
Forum: Brainstorm
Topic: Arduino/ATMega based Digital Soldering station
Replies: 56
Views: 56113

Re: Arduino/ATMega based Digital Soldering station

Sounds like a pretty good plan. The arduino does hardware pwm at about 490hz. Using a n-channel mosfet you can control the negative side. Make sure you have a heatsink on the mosfet. You can probably use a opamp to boost the thermocouple voltage. If you estimate the peak voltage on the thermocouple ...
by foxmiles
Thu Jun 07, 2012 2:59 pm
Forum: Brainstorm
Topic: Arduino Cruise Control
Replies: 1
Views: 5308

Arduino Cruise Control

My car's cruise control doesn't work. Sometimes it will kind of work, but it's jerky and generally touchy. It has a completely separate module to control the cruise, some people say it's that, but I tried a junkyard one and it does the same thing. They used a similar actuator since the early 80's. I...
by foxmiles
Wed May 30, 2012 11:55 pm
Forum: Off topic
Topic: Answering the Telephone
Replies: 4
Views: 4645

Re: Answering the Telephone

The $300/month could actually be a good deal for them (though they may not see it). Think what 2 service calls at $150 each would cost. Even just to change a faucet washer or a light bulb. I'd make sure you had the option to not go, or have a minimum notice in writing, something like "will respond a...
by foxmiles
Wed May 30, 2012 11:36 pm
Forum: Brainstorm
Topic: Few Circuit Ideas
Replies: 2
Views: 4199

Re: Few Circuit Ideas

You could try a atx bench psu build. I'd like to do some sort of a smps psu next time. I don't think you need a high amperage supply for charging your razors. You could do -12v(V-) and +3.3v(V+) for 15.3VDC. The -12v rail usually doesn't supply many amps, though that shouldn't be a problem for this ...
by foxmiles
Wed May 30, 2012 7:17 pm
Forum: Off topic
Topic: Answering the Telephone
Replies: 4
Views: 4645

Re: Answering the Telephone

Ha, yea sounds like you're better off without them. I agree with the handyman. I get $35/hr, $35 minimum and I'm cheap. I was going to raise my rates, but I'm moving now, so not much sense doing that anymore. I worked for a plumber probably 8 years ago and we got a $50 service call in town and $25/h...