DIY Meat Thermometer with Predictive Filter

To passionate chefs, cooking is an art. Knowing exactly when a cut of meat is cooked to perfection requires knowing your meat and your grill. But with a little bit of technology, we can build a digital meat thermometer, and use digital signal processing techniques to get a much faster response. This video explains how we can use the predictably slow heat transfer inside the temperature probe to mathematically model the sensor, and ultimately get a much faster response, with a little bit microcontroller computing power!

For more information check out the tutorial at http://www.nerdkits.com/videos/meat_thermometer/

Category:

Science & Technology

Tags:

• meat
• thermometer
• DIY
• microcontroller
• kit
• nerd
• nerdkits
• avr
• lm34
• temperature
• sensor
• transfer
• function
• step
• response
• linear
• system
• exponential
• decay
• cooking
• inverse
• first
• order
• single
• pole
• noise
• low
• pass
• filter
• predict
• model
• thermal
• conduction
• solder
• hamburger
• steak
• lcd
• atmega168
• digital
• signal
• processing
• dsp

[imroy264]

Very interesting work. But real nerds and engineers use metric. Units fail.

[Netherlands031]

Could someone help me with the math?

I don't understand how you get to the time constant... He says (7:21) that if you go forward by "1 time constant", but how do you know what the time constant is?

Also, at 08:00 they start crossing things out and ending up with only Vb. how did they do that? They took a formula, and took a partial derivative of it?

[MBChilladin]

@judgenap if you and i buy the kit they make $160.

[RedBand500g]

@Netherlands031 the 'time constant' is the time a system needs to reach 63.2% (or 1-1/e)of its final value. In the above example of a charging circuit the 'time constant' is RC.

The maths he's doing is just the mathematical representation of what he's showing graphically -> "if you follow the tangent at v(t) for RC you get to Vb"

[judgenap]

Brilliant. The same Maths is this what is used in share price prediction? Same Ideas? thanks folks . Will buy the kit soon

[bulls7123]

awesome explanation!

[cellularmitosis2]

Everything I needed to know in ten minutes! This is great!

[IRONMAIDENFAN2006]

you guys should go teach classes at mit.. you sound like reggular instructors,, this is a compliment

[cidadaovagamundo2]

G-R-E-A-T!

Nice job nerdkits!

[Afrotechmods]

Good camera work, lighting, voiceover, good production in general. Are you armenian?