where can you get serial/I2C memory for cheap?
the kind that you can attach to an arduino microcontroller?
@vidak Unfortunately, nobody sells extra RAM for Arduino's, as it's cheaper to just purchase a MCU with more memory.
You can use a SPI flash chip for extended storage space, but that requires either a 3.3V mod or logic voltage shifters.
You can use a SPI flash chip for extended storage space, but that requires either a 3.3V mod or logic voltage shifters.
@Suiseiseki i'm looking for good microcontrollers... anything with 8K RAM and above is good--do you have any suggestions?
@vidak No micro-controller is good - Arduino's seem to be the only ones that are easy to get that come with a free bootloader that have a free hardware design (but it seem it's over, as Qualcomm bought Arduino).
Apparently the RP2040 has a free bootloader available and that has 264KB RAM.
Apparently the RP2040 has a free bootloader available and that has 264KB RAM.
@vidak All existing microcontrollers have defects.
Arduino's are great for 5V, but those have limited memory, limited number of pins and limited drive strength (the ThinkPad X200 wants 16mA of drive strength to flash externally for example) and usually are linked over very slow usb bridges. 3.3V modding is possible, but that can require a downclock to not have stability issues for certain usages.
The RP2040 is not 5V tolerant and is 3.3V only, but it can do 12mA of drive strength, but it seems to come with a proprietary bootloader and it has a limited number of pins.
Arduino's are great for 5V, but those have limited memory, limited number of pins and limited drive strength (the ThinkPad X200 wants 16mA of drive strength to flash externally for example) and usually are linked over very slow usb bridges. 3.3V modding is possible, but that can require a downclock to not have stability issues for certain usages.
The RP2040 is not 5V tolerant and is 3.3V only, but it can do 12mA of drive strength, but it seems to come with a proprietary bootloader and it has a limited number of pins.
@Suiseiseki I see. I am not so bothered by pins, I have several RP2040s but it feels a little dirty to use them.
I know of the ATmega1284, but those are expensive.
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@vidak if SPI is an option for you instead of I2C and 3.3v signaling is OK for your Arduino, the APmemory APS6404L-3SQR-SN chips are great.