This is based on this guide: sensorkit.joy-it.net/index.php?title=KY-051_Voltage_Translator_/_Level_Shifter
This is a Level shifter, not to be confused with a Voltage Regulator.
"A level shifter connects one digital circuit that uses one logic level to another digital circuit that uses another logic level."
You can use the analogIn.py to test the values output.
The KY-051 follows the ratio 3,3V:5V (A:B). You should connect a 3,3V VCC into VCCa and a 5V VCC into VCCb.
Now, for every input connected to Bx (B1-B4) that uses 5V as VCC, you will have the translated value as a 3,3V max on Ax (A1-A4).
For instance: If we put a digital HIGH on B1, we should have a digital HIGH on A1. That means we will have 5V on B1 and 3,3V on A1, as it is translated.
The connections should be (ky051: board):
- VCCa : V (input 3,3V)
- VCCb : V (input 5V)
- GND : G
- OE : G
- A1-A4 : 3,3V input/output
- B1-B4 : 5V output/input (the opposite of Ax for Bx)