Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision		 Previous revision
spiffchorder:hardware [2008/05/20 21:36] – priestdospiffchorder:hardware [2023/02/09 23:32] (current) – external edit 127.0.0.1
Line 9: Line 9:
  
  
-===== Bill of Materials =====+ 
 + 
 + 
 + 
 +===== Bill of Materials (Digikey) =====
  
 Below is a list of the components needed to build the SpiffChorder. Below is a list of the components needed to build the SpiffChorder.
Line 21: Line 25:
 |CON3|Connection to switches. Can be wired directly.| |CON3|Connection to switches. Can be wired directly.|
 |CON4|Connection to LEDs. Optional.| |CON4|Connection to LEDs. Optional.|
-|D1, D2|3.6V zener-diode.|1N4729ADICT-ND| +|D1, D2|3.6V zener-diode.|1N5227BDICT-ND| 
-|IC1|Atmel ATmega168.|ATMEGA168-20PU-ND((With a slight change in the makefile you can still use the atmega8 digikey part number ATMEGA8-16PU-ND.  Both chips are also available from the nice folks at tuxgraphics, they are at http://shop.tuxgraphics.org/electronic/eth.html?id=1e4a62))|+|IC1|Atmel ATmega168.|ATMEGA168-20PU-ND((With a slight change in the makefile you can still use the atmega8 digikey part number ATMEGA8-16PU-ND.  There are two Makefile changes that need to be made when you compile the code.  These changes as well as a working hex file for the ATmega8 are at: [[.:using_the_atmega8]]. Both chips are also available from the nice folks at tuxgraphics, they are at http://shop.tuxgraphics.org/electronic/eth.html?id=1e4a62))|
 |   |28 pin socket for IC1|ED90054-ND| |   |28 pin socket for IC1|ED90054-ND|
 |R1|2.2 kOhm resistor.|OD222JE-ND| |R1|2.2 kOhm resistor.|OD222JE-ND|
Line 30: Line 34:
 |R8-R18|Optional pull-up resistors. 10 kOhm or 4.7 kOhm.|4610X-1-103LF-ND| |R8-R18|Optional pull-up resistors. 10 kOhm or 4.7 kOhm.|4610X-1-103LF-ND|
 |X1|12.000 MHz crystal.|XC1380-ND| |X1|12.000 MHz crystal.|XC1380-ND|
-|  |key switches|CH196-ND ((I have used the Cherry MX series for years, see http://www.cherrycorp.com/english/switches/key/pdf/keyswitch_cat.pdf))|+|  |key switches|CH196-ND or CH198-ND((I have used the Cherry MX series for years, see http://www.cherrycorp.com/english/switches/key/pdf/keyswitch_cat.pdf))| 
 +|  |key caps at [[http://www.wasdkeyboards.com/index.php/products/blank-keycap-singles.html|WASD Keyboards]]((Thanks to Kevin Wang for telling me about WASD))|Not available from digikey  | 
 + 
 +===== Bill of Materials (Conrad) ===== 
 + 
 +For residents in Europe, European based Conrad may be a better choice than the US based Digikey. This will save, in most countries (?) quite some shipping costs (and the environmental damage that goes with shipping over long distances). Some important remarks: 
 +   * The following list is based on an order placed with the **Dutch site** of Conrad, but after a short (and thus inconclusive) experiment it seems that it is the same for any Conrad site after you **omit the '- 89' suffix**. 
 +   * WARNING: the Atmel ATmega168 controller is only available in the tiny TQFP (and not DIP) format from Conrad, this requires a steady hand during soldering, and an adapter if you want to mount it on a universal PCB ((on youtube there are some fine instruction video's of how to do it)). 
 + 
 +^reference^description^Conrad part number^ 
 +|C1, C2|18pF ceramic capacitor.|457159 - 89| 
 +|C3, C5|100nF ceramic capacitor (decoupling).|453099 - 89| 
 +|C4|10uF electrolytic capacitor, min. 11V.|468231 - 89| 
 +|CON1|2x3 pin header, e.g. shrouded header from Harting.| 
 +|CON2|USB connector, alternatively cable with type-A plug.| 
 +|CON3|Connection to switches. Can be wired directly.| 
 +|CON4|Connection to LEDs. Optional.| 
 +|D1, D2|3.6V zener-diode.|180050 - 89| 
 +|IC1|Atmel ATmega168 (Warning: TQFP).|154885 - 89| 
 +|   |<del>28 pin socket for IC1</del>((useless with TQFP package))|<del>189515 - 89</del>| 
 +|R1|2.2 kOhm resistor.|405299 - 89| 
 +|R2|4.7 kOhm resistor.|405337 - 89| 
 +|R3, R4|82 Ohm resistor.|405124 - 89| 
 +|R5-R7|LED current limiting resistors. About 1 kOhm, depending on selected LEDs.| 
 +|R8-R18|Optional pull-up resistors. 10 kOhm or 4.7 kOhm.|to be added| 
 +|X1|12.000 MHz crystal.|155256 - 89| 
 +|  |key switches|706892 - 89| 
 +|  |key caps|707023-89| 
 +  
  
  
Line 50: Line 83:
   * R8-R18 are optional pull-up resistors. These should only be needed if the wires between the microcontroller and the switches are excessively long. A value of 10 kOhm or 4.7 kOhm should work, but remember that the lower the value, the greater the current consumption when the switch is pressed. Also, if not all switches are connected, some of the resistors can be left out in any case.   * R8-R18 are optional pull-up resistors. These should only be needed if the wires between the microcontroller and the switches are excessively long. A value of 10 kOhm or 4.7 kOhm should work, but remember that the lower the value, the greater the current consumption when the switch is pressed. Also, if not all switches are connected, some of the resistors can be left out in any case.
  
-===== Sample Layout ===== 
  
-There are a wide number of ways to layout the circuit.  A few samples are available on our [[Component Layout]] page.+ 
 +===== Sample Layouts ===== 
 + 
 +There are a wide number of ways to layout the circuit.  A few samples are available on our [[sample_layout]] page.