The following represents a bill of materials for the project. I calculate that, at the time of writing, I could get the project done for approximately £108(including vat and P&P) That price includes the more specialist items that you will need, but doesnt include things such as ply for the enclosures, screws, glue, cables etc.
Thanks greatly to kaos on openrcforums for providing some US sources. (These are prefixed with (US)
Please note that to get the items for that price will involve ordering ahead since some of the items are sourced from the Far East.The cheapest sources are a moving target. The first pan motor I got off ebay but then that source disappeared. Luckily I found an alternative source on Amazon.It is worth looking around. .
The p&P charges bump up the costs for some items. If you can club together, it should reduce that a bit.
All UK item prices include VAT.
|Part||Description||qty||Best price||sources (Best price first||comments|
|Tracker pan motor||Pololu style geared dc brush motor with 30:1 gearbox and quadrature encoder.||1||£19.99 inc P&P||Best price says its 29:1 gears but it is the same as the Pololu ie 30:1. Some have a cover over the encoder, which is nice but usually more.|
|Turntable (Slew ring)||Turntable to swivel the moving part of the tracker on||1||£18.98 + £5 for P&P|
Overall expensive for what it is. I hope to find a cheaper alternative. If anyone has suggestions let me knowVery expensive direct from Vex due to high postage. From Rapidonline , get 2 and you get free postage if you add something to push ex vat order over £30. Dont forget to get your pinion in the same order if you need it!
|Vex Pinion||Goes with the vex turntable. Has to be drilled out to fit the pan gearmotor.||1||£2.99 inc P&P ( from me)||These come in packs of 12 for some strange reason from Vex retailers at another £15. Contact me if you want a single one for £2.99 inc PnP, while my stocks last!|
|STM32F4 Discovery||Used as the brains for the Antenna Tracker on the ground||1||£12.77 + £5 (?) for P&P||These are a bargain! Buy 2! RS online has free deleivery on orders over £30.|
|Tilt Servo||Hobby servo used for tilt on the tracker. The ones here are probably overkill, so you could use your judgement and use an alternative if you have one||1||£12.95 + £2.50 (?) for P&P||You just need a big heavy duty servo with about 90 degree movement( which is standard). The plans however use the TowerPro 9805BB. You may have to adjust dimensions for othere servos.|
|Slip rings||Used to transmit video out of and control data in to the antenna tracker.||1||£7.45 inc P&P||They are probably these http://www.senring.com/SNM012A-12.html. If you can afford it, go for the 24 circuit version by the same supplier.|
|H-Bridge module||Used to drive the pan servo motor||1||£3.41 inc P&P||This is the one I used. Ideally get one based on the L298. Some are laid out slightly differently.|
|U-bec||Provides 5V at good current to drive the tilt servo.||1||£3.00 inc P&P|
|Airborne unit||Arduino Pro Mini used at the airborne side.||1||£3.69 inc P&P|
|Video distribution Amplifier||Buffer for video data out to goggles||1||£8.90 inc P&P||This one has 4 outputs. A smaller cheaper option would be a PCB with a video opamp.|
|0.1" pitch 25 x 2 header sockets||Useful to mount the STM32F4 Discovery board on a strip board so you dont need to solder wires direct to the pins.||2||£1.98 inc P&P||I would order a few sets so you can make various boards for different setups|
|Stripboard length x width||To mount the discovery board on. There are several additions and versions of the project. This allows easy experimentation||1||£2.87 inc P&P||Get a fewboards. Note that they must be 100 mm wide on the edge the the conductor strips are perpendicular to.|
|RS232 to TTL module||Required to get the data from the FrSky RcTx into the tracker.||1||£1.59 inc P&P||A nice alternative to the serial cable would be a radio modem.|
|m3 x 6 mm computer screws||To attach the pan motor||4||£1.99 inc vat P&P||These are often used for computer cases and to mount cdroms, hard drives etc|
|4mm ply||To construct the case||various||£12.99||To avoid carriage its easiest to go to your local Wickes store|