Invariably, when you want it...it's over there--the cooler, that is, holding your favorite beverage chilled to perfection. Whether you're at the beach, on a picnic, or sitting at home watching a DVD, when you get thirsty it's time to get up and make a round trip to the ice bucket, cooler, or fridge. Rather than making the effort, why not have the drink come to you?

Just Follow Me.

This Mobile Beverage Cooler is built from several odd-fellow discarded surplus components that are reincarnated in a robust remote-controlled platform capable of delivering a chilled drink container to you with just the wave of your hand. Now don't misconstrue Follow Me as a faithful servant awaiting your beckoning call, rather this mobile cooler is a proof of concept platform that can be the basis for a bigger and grander project.

Serving as the foundation for Follow Me is a discounted plastic model tank kit. This 1/25th scale Jagdpanther kit by Academy was selected solely based on price. There is neither actual nor implied endorsement of this German tank destroyer. If you can find another large scale armored fighting vehicle kit, use it.

It's been mentioned in various books and magazines that tank kits from Academy represent one of the best bargains in mobile platform hacking. Two motors complete with gearboxes are mounted in a neat, self-contained chassis. Even if you don't intend to build a tracked beverage cooler, this motor/gearbox combination can be used in a variety of other projects.

Controlling the movements of the plastic model tank are two Passive Infrared (PIR) sensors. Rather than sound an alarm, these motion detectors are modified to trigger a relay that, in turn, activates one of the tank's electric motors. Furthermore, a PIR sensor is independently tied to each motor. Therefore, crude turns and forward movements can be controlled by signals from a combination of both sensors. All is not bliss with Follow Me, however.

There are two significant and limiting parameters that govern the operation of the PIR sensor. First, there is a 15-second delay period following each sensor trigger. Therefore, sudden changes in direction might not be picked up by Follow Me.

A second limitation can be even more stubborn to overcome. Following a trigger by the PIR sensor, the relay is held closed for approximately two seconds. This duration translates into roughly 1-2-feet of travel. If a longer time of operation is desired delay circuits can be added to the relay's output. Instructions for this type of modification are supplied with each surplus PIR sensor.

During testing of Follow Me a range of 10-15 feet was needed for obtaining optimal sensor readings. Furthermore, the sensor is more sensitive slightly off center.

The operational Follow Me Mobile Beverage Cooler is easily capable of transporting a previously chilled drink to you (provided you are patient; remember the speed is roughly 1 inch per second as you wave your hands) or you can opt for adding your own drink chilling system with a Peltier Junction. This optional add-on chiller will require a separate 6.5-12V power source (plus thermal protection and heat dissipation).

Either way, arming your next party with a battalion of Follow Me Mobile Beverage Coolers could give a new definition to getting blitzed.

Step 1: How to Build Follow Me

Time: 7 hours
Cost: $58.94
Difficulty: Hard; requires delicate soldering and complex circuit building

Parts List

  • (1) 1/25th scale Academy Jagdpanther plastic model tank kit ($43.42; Squadron.com #MH1342 ) NOTE: If this kit is sold out; try substituting this Academy Panther-G tank kit; $57.09; Hobbylinc.com #acy1341 or this Tamiya tank kit: Tiger I; $83.85; Squadron.com #TM48202. Beware there is a non-motorized version of this Jagdpanther kit #13019.
  • (2) PIR sensor ($5.95; Electronic Goldmine #G4567)
  • (2) Coto SPST 5VDC reed relay ($1.00; All Electronics #RLY-475)
  • (2) 100mf electrolytic capacitor ($.16; DigiKey #P12919-ND)
  • (2) 1N914 diode ($.30 for 10 pieces; DigiKey #1N914-TPCT-ND)
  • (1) Beverage "cozy" or "snuggy," holder ($1; various discount stores)


  • Scrap perforated circuit board
  • Mounting hardware
  • Solder
  • Wire
  • (3) "C" batteries
  • (2) 9V batteries
  • Cable ties


NOTE: See Melcor for more information about Peltier Junction thermoelectric coolers.

The PIRs sometimes have adjustable pulse counters, also have a look at children ride-on electric trikes/bikes/cars. They're cheap can carry 20-30Kg, and are even dumped for curbside cleanup at times, steering and cheap plastic wheels are the con.
How does it manage to pick up the drink and so forth?<br />
dose it shot you if you dont take the drink?
tanks for the memory! thats the name of a hagans heroes episode
&lt;br/&gt;OR Use this in ur pool&lt;br/&gt;&lt;a rel=&quot;nofollow&quot; href=&quot;http://www.budshop.com/budshop/itemDetail.aspx?itemNumber=N15402A&amp;effdate=8%2f10%2f2007&quot;&gt;A FLOATING POOL SERVER&lt;/a&gt;&lt;br/&gt;&lt;br/&gt;Must BE 21 to enter the site&lt;br/&gt;<br/>
Floatin pool server not there any more but here some thing simular to it<a rel="nofollow" href="http://www.budshop.com/budshop/ItemDetail.aspx?ItemId=1567">http://www.budshop.com/budshop/ItemDetail.aspx?ItemId=1567</a><br/>
MOUNTAIN DEW is the best soda ever
mr pib i'm a pepsi fan myself of course for some reason i never drink it my parents always have coke in the fridge not pepsi oh well awsome project!!!!
NO COKE PEPSI, or not actually, ermm.... NO PEPSI, COKE!!!!
same here :(
wow. you apparently think puns are puntastic. you're having pun, aren't you? very punny. i'm done.
Hi great stuff. How cold will the can get in 30min? Thanks!
dr peper is beast
Ha this is Sick!
its a reed relay
I had the same idea but with like a back pack & it alarms when it goes to far (or when stolen)
You could replace the PIRs with phototransistors that control each motor and create a small battery powered Infrared flashlight to guide the robot with. the phototransistors would mount in the front with the right hand transistor controlling the left hand motor and vice versa. if the robot "sees" the light off to the right. the left motors turn on causing the robot to spin in the direction of the light untill the light can no longer be seen by the right transistor and instead triggers the left transistor. Creating a robot that will waddle towards the light. P.S. This idea is from a light spider kit I built in high school
sorry about the double post but i forgot something. the transistors go off at angles, they don't face straight on, and they have a limited scope(i forgot the real word but this sounds right). and you'll still need as the phototransistor cant switch that much current. it would also be nice to protect the transistors from visible light so only the "flashlight" would draw its attention.
Hi PSdp,<br/><br/>Please provide more info on Steps 3 &amp; 4 to my address: <strong>cr8_gr8@yahoo.com</strong>.<br/>Thanks.<br/>Rawbot<br/>
Brilliant! I'd like to see a video of it following somebody around. Actually, I'd like to see a whole convoy of them, with the first one RC - what a way to supply drinks to a whole party - beer conga!
lol i agree
Sweet... now we just have to learn how to create a bb sentry gun, to deal with pesky cats.
i agree with kiteman we would love it!
haha very nice

About This Instructable




More by PSdp:Weekly Project: The $250 Tablet PC and a Project Gone Horribly Awry Weekly Project: Follow Me--the Mobile Beverage Cooler Weekly Project: Starry Sight--A DIY CCD Camera for Astrophotography 
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