I have an i2c RTC ds1307 at24c32. the wiring diagram shows sda scl ports on both sides on chip. Does that mean i can inline add a i2c lcd to the other side? I was thinking lcd probably draws more power so run it to 5v instead of inline with rtc module. does this make since will it work like i am thinking? I havent ordered the lcd yet figuring out my design first i wanted to use as few pins as possible.
I havent ordered the lcd yet figuring out my design first i wanted to use as few pins as possible.
A serial LCD uses only one pin, in addition to power and ground.
heres the lcd im looking at. http://www.sainsmart.com/sainsmart-iic-i2c-twi-serial-2004-20x4-lcd-module-shield-for-arduino-uno-mega-r3.html
shows ... Pin Definition : GND?VCC?SDA?SCL
I2C devices are all connected in parallel.
A4/A5 connected to SCL/SDA on the other side of the board.
Whether you have a Serial LCD (connected to +5, GND, and TX), an I2C LCD (connected to +5, Gnd, and SCL/SDA), or and SPI LCD (connected to +5, Gnd, SCK, and MOSI) the power consumption is likely to be similar.
This one for example can do comminicate with all 3 of those.
This 4x20 does also