"pullup resistors to 3.3v for both SIOC and SIOD"

ComputerNerd / ov7670-no-ram-arduino-uno

Allows you to use a non fifo ov7670 on the arudino uno without external spi ram like other examples. Sends the data to UART.

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"pullup resistors to 3.3v for both SIOC and SIOD" #17

Open ThomasStock opened 8 years ago

ThomasStock commented 8 years ago

Novice here. I have been googling what pullup resistors are but I do not understand how "pullup resistors to 3.3v for both SIOC and SIOD" must be interpreted. Could you explain the schematic?

ThomasStock commented 8 years ago

I have found an explanation here: https://learn.sparkfun.com/tutorials/i2c "I2C at the Hardware Level" provides a schematic.

This made me understand it: "Unlike UART or SPI connections, the I2C bus drivers are “open drain”, meaning that they can pull the corresponding signal line low, but cannot drive it high."