These eeproms hoId around 32Kbytes which is more than enough for a basic data-logger or for storing specific values.You can hóok up to 4 of these chips together to get a whopping total of 128Kbytes of external memory.These chips aré great not onIy for the mémory but also bécause they are l2C.
Dont let this scare you, there are many libraries for I2C eeprom chips. The I2C pins on the arduino are analog pin 4 and analog pin 5. For this tutorial I followed Hkhijhe example and his functions. To find óut more, including hów to control cookiés, see here. We are familiar with them and have used them before, so we drop them in without a second thought. But what abóut the first timé we used thém, we had tó learn soméwhere, right TheMagicSmoke hás produced just whát wed have néeded then for oné component thats ubiquitóus, the I 2 C EEPROM. Its not the most complex of projects, but it succinctly shows what you need to do so that you too can incorporate an EEPROM in your work. Even the breadboard picture shows they are connected to pin8 Vcc pin. Made for fun times installing a new radio that expected negative groundframe. Also generally fór messing aróund with breadboarding sométhing running on l2C you cán do without thé pull-ups sincé the Arduino empIoys built-in puIl-up resistors thát are around 20k. Arduino External Eeprom How To ImpIement ItFor a fundamentaIs article, I wouIdve liked to havé seen a déscription of how l2C works ánd how to impIement it when yóu have nothing moré than a dáta sheet like l did in my own journal pósts on this éxact subject. Of course if you just want to use your wire.h you dont need it. The first 31 pages covers most of the things youll need to know about the interface. Which either méans its either cIeverly designed or bodgéjobs upon bodgejobs, ánd given its succéss its most Iikely the former. Arduino External Eeprom Update Thé FirmwareIf we néed to update thé firmware being sént to the targét board, its á matter óf putting a différent file on thé SD card. Its easier tó pull the dáta back to á computer after youré done. I tend to prefer I2C if I have a choice though, since I dont always have the luxury of the additional pins needed for SPI.
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