This came out from a need to scratch a personal itch. We needed a prompter to give signals when and where to kick the target for our Taekwondo practice. So we made a little dude who stands and beeps/blinks semi-randomly to show kick location. It’s a perfect kit to put together with a child as there are few parts and they are large and easy to solder. There are 59 total solder joints to make. The processor is socketed and can be inserted once all the assembly is done. This is an open source hardware design under CC BY SA license. You get a blank PCB and all parts needed, including preprogrammed MSP430G microcontroller. Uses two AA batteries and should run for a very long time- tested down to 1.8V and still operating.
Source code is available so you can tweak timing and behavior as desired. The processor (MSP430G2452IN20) can be reprogrammed in-circuit using SpyByWire or by taking it out and plugging into TI Launchpad. All unused pins and SBWD signals are brought out to test points on a 0.1″ grid for ease of hackability.
Board size is 83mm tall x 95mm wide.
Available as a kit on Tindie. Schematic is here.
Build instructions.
Step1
Check that you’ve received all the parts pictured:
Kit includes all parts pictured
Step2
Form resistor legs, by bending the leads with pliers 
Step3
Install resistors in their spots. Note that five of them are identical 100 Ohm (R1-R5) and R6 is different (47k). As you put them in, bend the leads to help hold them in place.
All resistors in place
Bend resistor leads to keep them from falling out during soldering
Next, solder them in.
Solder each lead, then trim them
Step4
Prepare capacitors C2 and C3 . You may need to bend the leads a bit to fit the 0.1″ spacing
Bend the leads apart a bit on the one marked 102
Step5
Install and solder C2 and C3. 
0.1uF cap (marked 104) goes into C2 spot
1nF cap (marked 102) goes into C3 spot
Step6
Install and solder power switch. Make sure all pins get soldered, including the support ones
SW1 orientaton
Step7
Install piezzo buzzer LS1, It is non-polarized and can go in either way.
Note cap C1 orientation
Step8
Install electrolytic capacitor C1. Note that the negative side is marked on the body and also with a shorter lead. Positive side is a square pad and marked on the board with a +
C1 positive side
C1 negative side
Step9
Install pin socket for the microcontroller. Make sure the notch on its body aligns with the notch on the silkscreen
Orient U1 socket as shown
Step10
Install LEDs D1 -D5 . The shorter lead goes into the square pad:
Shorter lead goes towards the square pad as shown
Step11
Take a close look at the board and make sure all parts are in the correct places and soldered:
Almost done- just need battery holders!
Step12
Install battery holders. They are keyed and will only go in one way (Plus side facing the top)
Note the orientation
Step13
Flip the board over, trim any remaining leads and check that all solder joints are indeed soldered. The three rows of unused holes are testpoints and can be ignored
Trim any long pins and inspect solder joints
Step14
Install the preprogrammed microcontroller, making sure its oriented to match the notch on the silk and the socket. Put batteries in. Note that they will only fit one way
Install processor with a notch facing the one on the socket. Put batteries in
You are done. Flip the power switch and enjoy the random beeping and blinking goodness of the kit you just built.The battery holders are heavy and flat, so the Kicky Dude has no troubles standing on his own.
Here are a few more pictures of the assembled unit:
Isometric view
Front view