## Saturday, October 25, 2014

### RPM Sensor Circuit Schematic For Robotics Using UGN3503

Eltronicschool. - Robotic can be completed with their own speedometer to know more about the speed when the robot run. To do this task you need RPM sensor now. And as we know that there are many RPM sensor module that offered to use that will connected to microcontroller. But in here we will offer you one circuit schematic for RPM Sensor module for robotic using UGN3503 that you can build by your self. And the detail circuit please see the figure 1 and figure 2 below.

Circuit Schematic

 Figure 1. RPM Sensor Circuit using UGN3503 (Source: electroschematics)
 Figure 1. UGN 3503 for RPM Sensor (Source: electroschematics)

Component List

From figure 1 above we can list the component as like:
1. Module UGN3503
2. IC LM358
3. R1 and R2 = 1K
4. P1 = 2K2
5. C1 = 100uF
6. C2 = 100nF
7. Led

Description

Circuit schematic like in figure 1 above is RPM Sensor Circuit Schematic For Robotics Using UGN3503 and figure 2 is UGN 3503 module for RPM sensor. According electroschematic blog describe that At the heart of this circuit is a Ratiometric Hall-Effect Sensor UGN3503. A Ratiometric Hall-Effect Sensor outputs an analog voltage proportional to the magnetic field intensity. It is one unipolar device operating at 5-volts. With no magnetic field applied the output is about one-half the supply voltage.

The voltage will increase with the south magnetic pole on the face or decrease with the north magnetic pole on the face. UGN3503 includes a Hall sensing element, linear amplifier, and emitter-follower output stage. Problems associated with handling tiny analog signals are minimized by having the Hall cell and amplifier on a single chip.

The output null voltage (B = 0 G) is nominally one-half the supply voltage. A south magnetic pole, presented to the branded face of the Hall effect sensor will drive the output higher than the null voltage level. A north magnetic pole will drive the output below the null level. In operation,instantaneous and proportional output-voltage levels are dependent on magnetic flux density at the most sensitive area of the device.

In our RPM Sensor Module circuit, UGN3503 (H1) gives an output propotional to the magnetic field intensity, which is converted into logical pulses by the OpAmp LM358 (IC1). Sensitivity of IC1 can be adjusted using the 2K2 multi-turn preset potentiometer (P1). The 3mm Red LED (LED1) here works as a visual aid to indicate a highlevel (H) pulse output.