electronics

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Sensor and modules Guide

LM393

• Voltage Comparator.
• 2 pins to connect to sensor.
• 4 pins to to connect to Arduino: GND, VCC, Analog output (A0), and Digital output (D0).
• It also has a configurable thresould using a Potentiometer. Thresould decides how much voltage should set the digital output (D0) to HIGH stage.

LM35

• Used to meassure environment temperature.
• 3 pins: GND, VCC, and analog output (A0).
• For every 1 centigrades of temperature, it outputs 10 milli-volts.

sensorValue / 1023 = temp / 500
temp = 0.488 * sensorValue

DHT11 Module

• Temperature and Humidity sensor.
• DHT11 component needs pullup resistor, but the DHT11 module already has the built-in pullup resistor on the board.
• Less accurate and slower than LM35. Outputs 1 times in a second. Useful for temperature 0-50 and humidity 20%-80%.

LCD 1602-I2C

• Liquid Crystal Display

PIR Sensor

• VCC, GND, and Analog output pings.
• Two potentiometer to config delay and sensitivity.

LM393 Sound Sensor

• It's a LM393 as described above, but instead of two sensor pins, it has a sound sensor built-in.

TCRT5000

• Reflective optical color detection module.
• Usually used for object detection, line tracking, and material detection.
• Installed on a LM303 module.
• On white surfaces it outputs 1023 (arduino), and 0 on black surfaces on the analog output.

L293D

• Used to control the speed and direction of up to 2 DC motors.

Others

• LED-RGB
• Seven Segments (e.g. TM1637)
• Dot Matrix
• Tilt Switch
• Active Buzzer: Black surface under the module. Use digitalWrite to set the pin to HIGH or LOW.
• Passive Buzzer: Green surface under the module (you can see the board). Use tone(pin, freq, duration) to generate frequency for playing different musical notes.
• Photoresistor
• DC Motors
• SG90 Servo Motors
• BYJ48 Step Motors (4 Phase) + ULN2003A Driver
• Ultrasonic Sensors
• 74HC595 Shift Register
• DS1302 Clock Module