Editing Hack Notes CVA 090421
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Working on our Schematics today - making decisions about parts, and discovering that Eagle is hard to use. | Working on our Schematics today - making decisions about parts, and discovering that Eagle is hard to use. | ||
Use Eagle software - common in the community, free for non-commercial use (and only $49 if you sell stuff that has small & simple boards) | |||
568-1708-5-ND = 12 bit shift register, 20-SOIC, $2.17 | |||
568-1708-5-ND = 12 bit shift register, 20-SOIC, $2.17 | |||
Sparkfun Arduino Pro Mini - 3.3V/8MHz | Sparkfun Arduino Pro Mini - 3.3V/8MHz | ||
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http://www.sparkfun.com/commerce/product_info.php?products_id=8783 | http://www.sparkfun.com/commerce/product_info.php?products_id=8783 | ||
We want an on/off switch. EG1943-ND $0.92 - lower profile | We want an on/off switch. | ||
- EG1943-ND $0.92 - lower profile | |||
- CKN9564-ND, $0.53 - winner for now | |||
3xAAA battery holder, 2479K-ND. Plus, pin out and part for JST jack (but no LiPo included in kit). | 3xAAA battery holder, 2479K-ND. Plus, pin out and part for JST jack (but no LiPo included in kit). | ||
Do we need mounting holes? NO | |||
Provide a pin out for talking to other circuits - I2C, SPI. Plus VCC and GND. | Provide a pin out for talking to other circuits - I2C, SPI. Plus VCC and GND. | ||
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Pin out for connections to compass IC. 6 holes in PCB, right angle female headers connect into male headers from HM55B. S4338-ND, plus S5517-ND on battery side - must clip bottom row leads. | Pin out for connections to compass IC. 6 holes in PCB, right angle female headers connect into male headers from HM55B. S4338-ND, plus S5517-ND on battery side - must clip bottom row leads. | ||
Bill Of Materials (BOM): we need to make a list of all parts once we have the circuit down. | |||
What shape do we want the board to have? Match shape of battery holder | What shape do we want the board to have? Match shape of battery holder | ||
People who want some boards: | People who want some boards: |