Converting system from the Mega down to the Pro Mini 5V. I think I blew the 3.3 Regulator on my Mega by I2C'sing 3.3 and 5V together.4" x 6" double sided perfboardArduino Pro Mini 5V 16Mhz3.3V 0.8A Voltage Regulator5.0V 1.0A Voltage RegulatorBMP085 Barometer/Temperature SensorHH10D HygrometerBlueSmirf RP-SMADS1307 RTC2x I2C Level Shifter
The power source is 9VDC nominal.
The BMP085 is 3.3V I2C.
The HH10D is 3.3V I2C with a frequency output for data processing.
The DS1307 is 5.0 V I2C.
First question: How can I correctly I2C the voltage mixture? Since I'm using a 5V board, do I run the BMP085 and HH10D through the level shifter to bring them up to 5V, or do I run the DS1307 through it and bring it down to 3.3V? i am assuming the former?
Second Question: Can I just connect the +5 of the Mini, VCC of the DS1307, and VCC of the BlueSmirf to the 5 volt regulator, and the BMP085 and HH10D to the 3.3V regulator? That way I don't have to worry about current consumption through the board itself, all it has to do is take in the I2C lines and the frequency output of the HH10D.