12 to 3.3V 2-Channel Level Converter / Shifter Wiki

Introduction

Are you still distressed that industrial sensors can't be used on Arduino? You may need to get a converter just like this!

This 12V to 3.3V level converter module with 2/4-channel photoelectric isolation features common anode / common cathode / differential signal inputs. The level shifter translates signal level from 12V to 3.3V and offers PNP output (NPN to PNP). It can be used for signal isolation, PLC signal level conversion, NPN to PNP signal conversion, polarity conversion, signal level voltage conversion and so on.

NOTE: Module DC power supply positive equals to the signal output voltage, for example, 12 to 3.3V module, power input VCC=3.3V.

Features

PNP Output (NPN to PNP available)
Output Signal Level (12V to 3.3V)
Signal Photoelectric Isolation

Specification

Input Channel: 2-channel Optocoupler Isolation/4-channel Optocoupler Isolation
Output Signal: PNP Output (NPN to PNP available)
Sensor Input Voltage: 12V
Module Supply Voltage: 3.3V
Input Signal Level: 12V
Output Signal Level: 3.3V
Output Current: no more than 50mA for each channel
Indicator: SMD LED
Size of Bare Board: 38x72x19mm/1.50x2.83x0.75”(2 Channel); 45x72x19mm/1.77x2.83x0.75”(4 Channel)
Size of Converter with Shell: 40x87x39mm/1.57x3.43x1.54”(2 Channel);47x87x39mm/1.85x3.43x1.54"(4 Channel)
Size of Screw Hole: 3mm
Installation Specification: With Shell (Fit on standard rails)

Board Overview

Common Anode Signal Input

Common Cathode Signal Input

Differential Signal Input

Tutorial

Requirements

Hardware
- DFRduino UNO R3 ×1
- 2-Channel Level Converter ×1
- Wires
Software
- Arduino IDE

Connection Diagram

Connection of Single-channel common anode 3-wire sensor to the UNO board.

Sample Code

    int input_pin = 7;
    void setup()
    {
      Serial.begin(9600);
      pinMode(input_pin, INPUT);
    //  pinMode(inpin, INPUT_PULLUP);//Input mode internal pull-up
    }
    void loop()
    {
       int reading = digitalRead (input_pin);
       Serial.println(reading);
       delay(100);
    }

Expected Results

If the signal input is low level 0, open the UNO serial port, then you can see it stably outputs high level 1.

Schematic Diagram

NOTE: When other different voltages and levels are converted, the resistance values in the diagram are different.

FAQ

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12 to 3.3V 2-Channel Level Converter / Shifter Wiki - DFRobot