B4R Question ESP32 and DS1307 , when try using i2c scanner, can't find i2c address.

janderkan

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I2C on Esp32 works flawlessly also with DS1307.
Do you know that IO21 is on pin 33 and IO 22 is on pin 36 on this module ?
1621495403874.png


What module do you have ?
 

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tzfpg

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I connect without using breakout board and pull-up resistor.
It is we need to used pull-up resistor in order to used DS1307?
How many Kilo Ohm pull-up resistor I needed for 5v power?
 
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