digispark:tutorials:expander
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digispark:tutorials:expander [2013/03/01 16:11] JPenguinCA Corrected SCL pin number |
digispark:tutorials:expander [2016/06/09 12:03] |
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| - | ======Expander Shield Kit Tutorial====== | ||
| - | =====Product Description:===== | ||
| - | [[https://s3.amazonaws.com/digispark/images/m/expander7.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander7.jpg}}]][[https://s3.amazonaws.com/digispark/images/m/expander2.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander2.jpg}}]][[https://s3.amazonaws.com/digispark/images/m/expander1.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander1.jpg}}]] | ||
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| - | The Expander Shield Kit allows you to build a Digispark shield which connects a PCF8574P Remote 8-bit I/O expander IC to the Digispark development board. It communicates with the Digispark over the I2C bus and provides 8 more digital i/o pins that can be controlled by the Digispark. | ||
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| - | This is an unassembled kit and requires basic soldering. This is designed for use with the Digispark development board, which is not included. | ||
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| - | =====Parts:===== | ||
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| - | ^ Part ^ Quantity ^Identification^ | ||
| - | | Expander Shield PCB|1| | | ||
| - | | 4.7K (4K7) Ohm 1/4W resistor 1% or 5%|2| Yellow - Violet - Red| | ||
| - | | 16 pin DIP socket |1|| | ||
| - | | PCF8574P IC|1| | ||
| - | | 1x8 pin female 0.1" pitch header|1| | ||
| - | | 1x40pin male 0.1" pitch header| 9 pins worth| | | ||
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| - | **Resistor Values:** For more information on how to identify the value of the resistors we recommend these sites: | ||
| - | A nice simple resistor calculator: http://www.ealnet.com/m-eal/resistor/resistor.htm | ||
| - | A comprehensive article on identification: http://www.diyaudioandvideo.com/Electronics/Color/ | ||
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| - | **Soldering:** If you are new to soldering we recommend the following tutorials: | ||
| - | Soldering Basics (http://www.sparkfun.com/tutorials/106) and Soldering Crash Course from the folks at Sparkfun (http://www.sparkfun.com/tutorials/354). | ||
| - | How to solder from the Curious Inventor: http://store.curiousinventor.com/guides/How_to_Solder | ||
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| - | Adafruit has this excellent guide that starts with the tools needed and then shows detailed pictures, including some of the common problems that beginners experience (http://learn.adafruit.com/adafruit-guide-excellent-soldering) | ||
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| - | **We assume for these assembly instructions that you know the basics of thru-hole soldering. If you don't check out the links above, these boards are very easy to solder - we promise!** | ||
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| - | =====Assembly:===== | ||
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| - | **NOTE:** If you have a "Model B" board you may need to cut the trace to the onboard LED before using any I2C devices - Find out how to tell which board you have and what to do here: [[digispark:tutorials:modelbi2c]] | ||
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| - | Empty kit bag (or if using a raw PCB, aquire parts) and verify contents. | ||
| - | **Note for Kickstarter Backers and Pre-orders:** Headers are not included in each kit bag, but the entire order came with more than enough headers for all kits. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander7.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander7.jpg}}]] | ||
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| - | Solder resistors one at a time. Solder the leads and clip off the excess. Repeat for all resistors. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander6.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander6.jpg}}]] | ||
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| - | Insert the 16 pin DIP socket into the board matching the indention cut out on one end with the indention printed on the board. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander5.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander5.jpg}}]] | ||
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| - | Insert the 8 pin female header (on the top of the board) and solder each pin. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander4.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander4.jpg}}]] | ||
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| - | Cut a length of male headers 6 pins long and one 3 pins long. Insert into corresponding positions (on the bottom of the board) and solder each pin. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander3.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander3.jpg}}]] | ||
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| - | **Tip:** Inseting the headers into a breadboard and then placing the board on top can make this process easier. | ||
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| - | **Note:** If you are using stackable headers, use them here instead of the standard male headers. | ||
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| - | Insert the PCF8574P expander IC into the 16 pin DIP socket matching the indention cut out on one end with the indention on the socket. | ||
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| - | [[https://s3.amazonaws.com/digispark/images/m/expander2.jpg|{{https://s3.amazonaws.com/digispark/images/t/expander2.jpg}}]] | ||
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| - | Your expander shield is complete! | ||
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| - | =====Programming:===== | ||
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| - | The pin connections are as follows: | ||
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| - | Digispark P0 -> SDA\\ | ||
| - | Digispark P2 -> SCL | ||
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| - | The I2C Address is 0x20 - this address can be changes with the on-board solder jumpers. Please refer to the schematic and datasheet for more info. | ||
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| - | Please refer to the expander example included with the Digispark Arduino Addon. | ||
digispark/tutorials/expander.txt · Last modified: 2016/06/09 12:03 (external edit)
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