Hello I'm trying to setup a external eeprom chip i bought from amazon over a year ago. They came in a pack of 31 of 8 different values. All of them say 24c02, 24c08, 24c16, 24c32, 24c64, 24c128, 24c256, 24c512 can be found here.
So i looked them up and i have found a few sites for how to wire them up.
1 (A0) to GND
2 (A1) to GND
3 (A2) to GND
4 (GND) to GND
5 (SDA) to Arduino Analog Pin 4 Add 4.7k7 Aesistor To Vcc
6 (SCL) to Arduino Analog Pin 5 Add 4.7k7 Aesistor To Vcc
7 (WP) to GND
8 (Vcc) to Vcc (5 Volts)
I didn't write that above i just only copy and paste it.
So i wired them up and added 4.7k resistors. however when i go to power them up the power led on the arduino was dimm and nothing was coming from the arduino when i tried to do a i2c scan.
Then i powered it down and took off the resistors and turned it back on then arduino powered up with no probem. I tried another i2c scan and still didn't find nothing. So i thought the resistors was pulled to ground instead of vcc high. I tried to put back resistors to vcc the arduino power light was dimm again and arduino was dead.
I don't know what to do now i have tired all the eeproms and all showed the same problems.
On the eeprom they say
ATMC087
24C128N
PU27
Some of them have the N at the end and some don't. At this point i have no clue what to do. Can someone please help me with this problem.
Hello groundfungus. I'm sorry i didn't include that in there it is a uno board. I figure out my power problem it was my fault. So i maybe burned it out putting vcc to a ground pin on the eeprom. So i have tired another eeprom and no power problems but nothing on the i2c lines. So maybe i thought i killed the uno board.
Then i have tried my arduino uno board. And nothing on the second eeprom.
Hello yes i did they are 4.7k something and the other one comes up 4.7 something i forgot the rest they come from a book of resistors i bought because i have a hard time reading resistor colors. I did also test them on a meter and they are 4.7
Even if i took off the resistors it still the same thing it made no difference. I should of at least saw a address even if i can not read or write nothing to the eeprom chip.
Hello i did look it is all correct that i can find every page i looked every datasheet i looked it seems to be all correct. I have no clue what is going on.
Okay i found the problem. The resistors was the wrong ones. They are 4.7ohms not 4.7k resistors they are in the wrong place. I didn't put them that is how i got them i never used them into now the labels are wrong. And i have to go through all the resistors. I thought it was 4.7k but it was 4.7ohms. I'm sorry about that. It is all working now and addressing works.
Hello i have one more question to ask. If i was to use this on my Arduino zero board because it is at 3.3v logic and i need 3.3v power. Which resistors should i use?
