• 1 Arduino
, (The bluetooth version would spare the need for a BT module, but wireless control is optional)
• 1 Adafruit Motorshield,
You can look on the site to get a distributor and will need to assemble the thing yourself (DIY from the very beginning). Making it is good for your self esteem.
• 1 Green Laser pointer
, Depending on your country this may get hard to get on a store, but you can always trust in Ebay where they are cheap and easy to find.
• 1 Stepper Motor
Recommended to buy a standard Stepper like the linked one from Sparkfun. I chose this for the base (azimuth) that needs to fully rotate 360°, because it has a decent step "resolution" and it's also a lot easier to control than a 360° servo.
• 1 Servo Motor
Standard servomotors are the easiest motors to control and they are light to mount in different orientations. They also have an absolute 0° position so you know it will always go back to the same position after you reset. For the elevation rotor this is ideal and their 180° range is more than enough.
• 1 Pan/Tilt Bracket
This is useful to mount the laser on the Servo.
• 1 Lithium Battery
or external power source
. Depending on your stepper motor, this should give you between 7.4V and 12V with 600mAh - 1000mAh. The link shows the battery I used, but it discharged quite quickly and chargers aren't cheap. My household tip is to use your Video camera battery. That saved me in one presentation and the battery didn't even noticed it. Warning: A standard 9V Battery you'd use for prototyping will not offer you enough current to move the Motor flawlessly, so don't try too much with it else the stepper will behave erratically.
• 1 Bluetooth modem (Optional)
If you work with a non BT Arduino and want to incorporate wireless communication, then let's try this.
1 Accelerometer compass (Optional and experimental)
This gives you the chance to tell your cannon where the north is located, so it is more precise. But there are some issues to it and you're not really trying to shoot the sat down, so it's all up to you wether you want precision or not.
•Prototyping wires (Jumper)
A bag of 30cm-long and one of 15cm-long capped wires will be ok. These help keep things in place and some order. Yo'd like to have also a couple of wire rolls, just to patch something else or build the circuit for the laser.
1 Mounting hub for stepper Motor
and some L Servo Brackets
to assemble them motors...
1 Custom laser holder.
This was self made and printed in a hacklab in Berlin, You might want to find a solution with some other holder or download the .stl find a 3D printer near you
4 acrylic plates of approx. 10x10 cm or bigger for the case
Bolts and nuts + steel angles + a driller and a screwdriver (See pictures in step 4 if this is not clear)
A silicon gun or a cold-silicon tube.