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Not really DIY but Auberins.com has awesome temp probes with 1 wire sensors or lm35 type sensors.

It would be cool to build a tap handle out of legos. It would look kind of 8-bit if you did it right. I'm thinking like this:

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I've been wanting to do this with a raspberry pi for a while. It would be around the same price and you would have a much powerful controller capable of running its own webserver.

It seems that if you insulated it well then you could heat to strike temp, the turn off the element for the mash. then lift the bag out for the sparge and turn the element on for the boil. if you can't maintain mash temps then your looking at some sort of false bottom. It would also be cool to...

Now you just needs some load cells/strain guages to know when the keg is empty!

I'm actually doing kinda the same thing with an arduino, SSR's and 1 wire temp sensors. I tether the arduino to my laptop for control and logging though. You should look at brewtroller.com. It's basically running on a modified arduino on a specially made board. They done some pretty cool...

thomashp 1x CM‐PALE, 2x CM‐2ROW

I think I have my design. Here's my sketch.

So I brewed this kit from Northern Brewer a little while ago. It is basically a hoppy wheat beer. I really liked it, but I felt it could use a little more malt flavor and mouth feel. The hops were just about right. How do you guys think I should change it? Wheaten Beatdown Ingredients Amt...

So that's the 5th option now... There's too many choices!

I'm curious about that. What happens when you pump from the mash tun? Can you actually sparge faster than gravity would normally go?

Approximate prices: Electric element $20 PWM board $10 2x SSRs $30 Weldless element adapter for keggle $10 Weldless bulkhead and stainless ball valve $20 Dip tube (roll your own copper) $5-10 (or get a fancy stainless one $25) You'll need some sort of box to mount your controls in $20 and a nice...

I'd be curious to see how many SSRs are inside of the box. If you get a chance could you take a picture inside that plasitc box?

I am ready for a brew stand. I've been going gravity for a while and more recently have started doing 10 gallon batches. I'm already tired of picking up 10 gallons of liquid. Here is my current setup: I'm getting a pump and building a brew sculpture. I really only want to get one pump...

Here's mine.

That PLC setup is awesome, but it's a little pricey. I have built a custom system using an Arduino and my laptop. Basically it's just a small microcontroller that controls a couple of SSRs and reads some temperature sensors. It communicates over a serial connection to a custom program I wrote...

The main difference I see is that with motorized ball valves you can open and close the valve at different amounts. With a solenoid valve, you either have on or off. There are advantages of both though. A motorized valve requires a separate motor controller and wiring. A solenoid valve is safer...

I'm sourcing parts to build my own sight glass and it seems the most expensive part of thing is the pipe to tube compression fitting. I've come across this... http://www.usplastic.com/catalog/item.aspx?sku=60424&catid=676 Does anyone see a reason this wouldn't work?

On demand water heaters are the way to go! We use some at work that max out at 185degF. One of those babies could be an instant never ending HLT.