Description:

This is a high quality module, sound sensor \ detector. The device is equipped with a potentiometer sensitivity adjustment so you can detect sounds of varying range intensity .

Product specification:

Size: 32mm X 17mm X 8mm(length X width X height)

Weight: 4g Main chip :LM393, Electret condenser microphone

Working voltage: DC 4-6V

Signal output indication

Single channel signal output

The output effective signal is low level

This is a very small light sensor. A photocell changes resistance depending on the amount of light it is exposed to. These little sensors make great ambient light triggers (when light in the room turns on, do something).

Specifications:

• Light resistance : 10k Ohm
• Dark resistance : 20k Ohm
• Max voltage : 150V
• Max power: 100mW

Dimensions:

• 2 x 4 x 5mm
• 4mm between pins
• 31mm lead length

Description

Features: 13.56Mhz, S50, Mifare One

RC522 IC Brief Introduction

MF RC522 is used in highly integrated 13.56MHz contactless communication card chip to read and write, of NXP for “three” and the application launched a low voltage, low cost, small size, non-contact card chip to read and write, intelligent instruments and portable handheld devices developed better.

Features
1. A passive buzzer that needs square signals of 2k-5k to drive, for it has no built-in oscillating source, and then makes sounds when energized.
2. Use an S8550 PNP transistor for drive.
3. Controllable sound frequency – it can make the buzzer beep like Do, Re, Mi, Fa, Sol, La, Ti.
4. Working voltage: 3 - 5V; PCB size: 2.0 x 2.0 cm.
5. With power light and indicator of digital signal output.

Features
1. BUILT-IN OSCILLATING SOURCE – Produces sound once connect to power.
2. LOW LEVEL TRIGGER - A single low level can make the buzzer beep.
3. ANTI-REVERSE PORT - Provides a firm connection.
4. INDICATORS - With power light and indicator of digital signal output.

Working voltage: 3 - 5V
SIZE - PCB Size: 2.0 x 2.0 cm

For more info, please refer to http://wiki.sunfounder.cc/index.php?title=Buzzer_modules

• DESCRIPTION

An Linear hall sensor consists of Hall element, linear amplifier, and emitter follower and it outputs analog values.If you add a comparator to Linear hall sensor it will be able to output both analog and digital signals.we call it as analog hall sensor .

Principles

when the sensor approaches the magnet, the value of pin A0 will change. When the value exceeds the threshold set by the potentiometer before, D0 outputs low level and the corresponding LED lights up.

overview

Based on the Hall Effect, a hall sensor is a one that varies its output voltage in response to a magnetic field. Hall sensors are used for proximity switching, positioning, speed detection, and current sensing applications.

Hall Effect

.1 µF Ceramic Disc Capacitor (104) 

0.1 µF Ceramic Capacitor (104)

Formula:

104 = 0.1mfd = 10*104 = 105pf = 100nf

General Calculation:

The value of this unit is considered too basic, so the unit farad is reduced again to the units as follows:

Description

The L293 and L293D devices are quadruple high-current half-H drivers. The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V. The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. Both devices are designed to drive inductive loads such as relays, solenoids, DC and bipolar stepping motors, as well as other high-current/high-voltage loads in positive-supply applications.