Purchasing guidelines for ECE Senior Design projects
Each team in Design I and II (with no additional source of monetary support)
will be allotted $250 to be used during the semester. Some teams already have another
source of funding, and will not receive money from this donation, but the
guidelines for the use of any funds are the same. These guidelines are designed
to keep the bookkeeping tasks organized, and thereby ensure that you get the
components you need for your designs.
Teams are urged to be as frugal as possible, both to make sure that the
money lasts you throughout the semester, and to keep the cost of your design
down. Don't think "we can afford a more expensive processor, board,
etc." just because you won't be paying for it out of your own pocket.
Major costs for Design I usually include prototype parts, while major costs for
Design II usually include the production parts and PCBs (you might even want to
include in your budget a second PCB revision). Also don't forget to consider
the cost of any items you might need for testing your projects.
- Purchasing
policies
- There
should be only one point of contact for each team, so early on, appoint
one team member to handle all parts requisition tasks. Also, please try
to plan your orders with plenty of time for the items to get to you. You
want to spend your budget on parts, not expedited shipping charges.
- The
Senior Design TA will coordinate all ordering and shipping. All orders
will be shipped to the ECE department. There will be one day of the week
that all component orders will be placed and one day for all PCB orders.
Understand that you can send in your parts list or PCB files anytime you
want, but the order won't be placed until the assigned day.
- All
component orders will be placed on Tuesdays.
- All
PCB orders will be placed on Thursdays.
Note: PCB orders won't be checked for design correctness, the ZIP file
you provide will be forwarded to the PCB vendor, who will build exactly
what is specified in the files. Double check your design before
you order boards.
NOTE: If shipping on your item is
MORE than 1/3 the cost of the item, then your order will be delayed until it
combined with some other order. You need to work with the Senior Design TA to
order from common vendors like Digi-Key, Jameco or Mouser in order to combine your small order with
some other team’s order to form a larger order.
- Electronic
Component Suppliers
- Digi-Key
(www.digikey.com) : Capacitors, resistors,
diodes, discrete ICs, microcontrollers, and probably anything else you
can think of. The only problem with Digi-key is
that they tend to be expensive.
- Mouser
Electronics (www.mouser.com) : another one-stop-shop for electronic
components
- Jameco
Electronics (www.jameco.com) : ICs and other components, lots of power
supplies and cables
- MPJA Online (www.mpja.com) – large variety,
cheap.
- Electronix
Express (www.elexp.com) – large
variety, cheap.
- All Electronics
(www.allelectronics.com) –
large variety, cheap.
- Crystal Fontz (www.crystalfontz.com)
– best place to order LCDs of any type.
- You are
forbidden to order from the following companies:
- Futurlec
(www.futurlec.com) : Causes invoicing problems since they use Australian
currency.
- Printed Circuit
Board Suppliers
- Advanced
Circuits (www.4pcb.com) : This company has
student specials; either special student pricing on multilayer boards, or
no minimum quantity on 2 layer boards. This is where I will order your
board by default.
- PCBEX (www.pcbex.com) – I will use this
site if you require some special board thickness or other feature.
- PCB Fab Express (www.pcbfabexpress.com) : Inexpensive
boards, requires a 5 piece minimum order
- Things that you
cannot order using this support:
1.
USB-to-serial adapter, breadboard, wiring
kit – this is generic ‘equipment’ that you should have left
over from Microprocessors and is useful after this project is over with –
if you lost it or sold it, don’t make the ECE department buy it for you.
2.
PIC Microcontrollers or other parts
from Microchip – Microchip has a very good sample program at www.microchip.com. Please use this for ordering PIC microcontrollers.
I will order through normal channels if you cannot get the samples that you
need from Microchip.
- Samples
-- or -- FREE STUFF!!
When an engineer starts a new project and is thinking about using a new
part, they don't order 5 pieces from DigiKey, they
call up the vendor's representative and ask for some sample parts (and the
engineer will hint that the rep should take them to lunch to discuss the
new project). You may not get taken out to a free lunch, but check the
manufacturer's website for information on getting sample parts.
Manufacturers know that if you become familiar with their parts during
school, you may use that part in one of your designs when you graduate.
If you're having trouble finding information about samples, the Southeast
US representatives for most IC vendors are based out of Huntsville, AL or
Raleigh, NC.
Here are a few example links to IC manufacturers' sample programs:
Microchip : http://sample.microchip.com
Freescale : http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=010984007869597059286929489&tid=FSH
Texas Instruments : http://www.ti.com/home_b_samples
Maxim (Dallas Semiconductor) http://www.maxim-ic.com/
Linear Technology http://www.linear.com/index.jsp