Ocean College and School Students Science Projects materials

his is a small and easy to use 2 channel relay board that works on low voltage. Use it to control two 240V power appliance directly from microcontrollers or low voltage circuits. Perfect for switching 240V appliances - lights, fans, etc, and even high power motors at lower voltages.

Features: * Input supply 12 VDC @ 42 mA
* Relay specification 5 A @ 240 VAC
* Trigger level 2 ~ 5 VDC
* Burg connector for connecting power and trigger voltage
* LED indicates relays status
* 3-pin burgstick for 12V supply, ground and input connection
* Screw terminal connector for easy relay output connection

In this board BC547B transistors are used to drive relay and diodes 1N4148 are used to proctect transistors from the Back e.m.f. generated by the coil in relay.

It is a power amplifier that accepts a low-power input from a controller IC and produces the appropriate high-current gate drive for a power MOSFET. A gate driver is used when a pulse-width-modulation (PWM) controller cannot provide the output current required to drive the gate capacitance of the associated MOSFET. Gate drivers may be implemented as dedicated ICs, discrete transistors, or transformers. They can also be integrated within a controller IC. Partitioning the gate-drive function off the PWM controller allows the controller to run cooler and be more stable by eliminating the high peak currents and heat dissipation needed to drive a power MOSFET at very high frequencies.

Specifications: * Transistor Type: MOSFET
* Transistor Polarity: N Channel
* Drain Source Voltage, Vds: 100V
* Continuous Drain Current, Id: 33A
* On Resistance, Rds(on): 44mohm
* Rds(on) Test Voltage, Vgs: 10V
* Drain Source On Resistance @ 10V: 44mohm

4 Ch Relay Board: This is a high quality 4 channel relay board that works on 12V. Use it to control power appliances directly from microcontrollers or low voltage circuits. Perfect for switching 240V appliances - lights, fans, etc, and even power hungry motors.

Features: * Input supply 12 VDC
* Relay specification 5 A @ 240 VAC
* Trigger level 2 ~ 5 VDC
* IC ULN2003 is used to drive relays
* Power indicating LED and relays status indicating LED's
* 6-pin male burgstick for 12V supply, ground and input connection
* Screw terminal connectors for easy relay output connection

LED's are most basic part of Electronics, in this board 4 LED's are used and cathode of each LED is connected with ground terminal through 1K ohm resistor and 5-pin male burgstick connector is used for input connections.

The swicthes are the basic input device, which are used more commonly with microcontroller to control the device. This board contains four 4-pin SPST switches and 5-pin male burgstick connector.

How to interface Switch with microcontroller development boards(8051, AVR, PIC) go to Tutorials Tab.

A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.

Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or 100 keys directly MCUs i/o. Because : * It will eat up precious i/o line. * MCU to Keypad interface will contain lots of wires. We want to avoid all these troubles so we use some clever technique. The technique is called multiplexed matrix keypad. In this technique keys are connected in a matrix (row/column) style.

A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.

A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.

Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or 100 keys directly MCUs i/o. Because :

* It will eat up precious i/o line.
* MCU to Keypad interface will contain lots of wires.
We want to avoid all these troubles so we use some clever technique. The technique is called multiplexed matrix keypad. In this technique keys are connected in a matrix (row/column) style.

A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.

Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or 100 keys directly MCUs i/o. Because : * It will eat up precious i/o line. * MCU to Keypad interface will contain lots of wires. We want to avoid all these troubles so we use some clever technique. The technique is called multiplexed matrix keypad. In this technique keys are connected in a matrix (row/column) style.

A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.

Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or 100 keys directly MCUs i/o. Because : * It will eat up precious i/o line. * MCU to Keypad interface will contain lots of wires. We want to avoid all these troubles so we use some clever technique. The technique is called multiplexed matrix keypad. In this technique keys are connected in a matrix (row/column) style.

This is a high quality 8 channel relay board that works on 12V. Use it to control power appliances directly from microcontrollers or low voltage circuits. Perfect for switching 240V appliances - lights, fans, etc, and even power hungry motors.

Features: * Input supply 12 VDC
* Relay specification 5 A @ 240 VAC
* Trigger level 2 ~ 5 VDC
* IC ULN2803D is used to drive relays
* Power indicating LED and relays status indicating LED's
* 10-pin male burgstick for 12V supply, ground and input connection
* Screw terminal connectors for easy relay output connection

LED's are most basic part of Electronics, in this board 8 LED's are used and cathode of each LED is connected with ground terminal through 1K ohm resistor and 9-pin male burgstick connector is used for input connections.

How to interface LED with microcontroller development boards(8051, AVR, PIC) go to Tutorials Tab.

The swicthes are the basic input device, which are used more commonly with microcontroller to control the device. This board contains eight 4-pin SPST switches and 9-pin male burgstick connector.

Analog to digital converters find huge application as an intermediate device to convert the signals from analog to digital form. These digital signals are used for further processing by the digital processors. Various sensors like temperature, pressure, force etc. convert the physical characteristics into electrical signals that are analog in nature.

ADC0804 is a very commonly used 8-bit successive-approximation analog-to-digital converter that uses a modified potentiometric (256R) ladder. It is a single channel IC, i.e., it can take only one analog signal as input. The digital outputs vary from 0 to a maximum of 255.

To know more about ADC0804 IC download the datasheet attached at the below link

Analog to digital converters find huge application as an intermediate device to convert the signals from analog to digital form. These digital signals are used for further processing by the digital processors. Various sensors like temperature, pressure, force etc. convert the physical characteristics into electrical signals that are analog in nature.

Features: * 0V to 5V input range with single 5V power supply
* This Board can be used to Interface with 8 bit Microcontrollers
* ADC 8 bit Resolution Data
* 8-channel multiplexer with address logic
* Male Burg stick connectors to Data , Control signals, input and output connections.
* On board power indicating LED

The aPR33A series C1.0 is specially designed for simple CPU interface, user can record or playback up to 1024 voices by 5 I/Os only. This mode built in one complete memory-management system. The control side doesn’t need to be burdened complicated memory distribution problems and it only needs to be through a simple instruction to proceed the audio/voice recording & playback so it largely shorten the developing time. Meanwhile,Chip provides the power-management system too. Users can let the chip enter power-down mode when unused. It can effectively reduce electric current consuming to 15uA and increase the using time in any projects powered by batteries.

The aPR33A series C2.1 is specially designed for simple key trigger, user can record and playback the message averagely for 1, 2, 4 or 8 voice message(s) by switch, It is suitable in simple interface or need to limit the length of single message, e.g. toys, leave messages system, answering machine etc. Meanwhile, this mode provides the power-management system. Users can let the chip enter power-down mode when unused. It can effectively reduce electric current consuming to 15uA and increase the using time in any projects powered by batteries.

The DAC0800 consists of a 8 data lines and REF voltage lines.When the DAC is given the digital input it converts the Digital data to corresponding current, to convert the I to V we use UA741.

Features: * 8-bit high-speed current-output DAC(0800) IC
* Input supply 5V
* Male burgstick connectors for supply, input and output connections.
* Op-amp UA741 to convert the I to V.

Decodes DTMF (Dual Tone Multi Frequency) to 4 bit binary value. Connect this with your cell phones earphone, dial your number from another cell phone and press any keys. Those keys will be decoded to 4 bit values on the DTMF decoder module connected on first cell phone. This module can be used to make mobile operated robots and other mobile operated gadgets.

This board allows you to decode a chain of the telephone DTMF signals. It serves so much to know that number has marked the telephone like thus also a VHF one or to look around in the hidden messages that some television transmitters insert in their band of audio.

The heart of the circuit is a DTMF decoder IC with capability to decode 16 tones. When a valid DTMF signal is applied to the input of the board, a proper 4-bit code will appear on D0-D3 output pins and V(valid) pin will generate an interrupt signal for informing a micro-controller or any other device that you connect.

Gaming keyboard which is most commonly used gaming input device now a days. This board contains four 4-pin Single Pull Single Throw switches which are used for front, back, left and right. 5-pin Male burgstick connector is used to connect to the device.

The IR Proximity Sensor has Receive(Rx) and Transmit(Tx) pair that enable the detection of obstacles. While the application of the board is universal, the board is specifically designed for line follower applications.

With precision potentiometers that can set the sensitivity of the detector circuit, the range of detection can be set to suit your application. Typical detection range is greater than 1 foot(300 mm), and can be reduced to suit your need.

Features: * Input supply 5V
* LM358 IC used
* Precision potentiometer
* 3-pin male burgstick connector for i/p, gnd and o/p connections.
* Obstacle indication LED.

This module is a medium power motor driver perfect for driving DC Motors and Stepper Motors. It uses the popular L293D motor driver IC. It can drive 4 DC motors in one direction, or drive 2 DC motors in both the directions.

Features: * L293D motor driver IC.
* Male burgstick connectors for supply, ground and input connection
* Screw terminal connectors for easy motor connection

This motor driver is perfect for robotics and mechatronics projects for controlling motors from microcontrollers, switches, relays, etc. Perfect for driving DC and Stepper motors for micromouse, line following robots,robot arms, etc.

This 7-segment kit contains four 7 segment LED display. So by using this kit we can display maximum up to a 4 digit number. One more interesting feature of this kit is that instead of 32 pins requirement (4 segments X 8 pins each) for displaying four digit numbers we just need 12 pins of the microcontroller.

Features: * Four 7-Segment displays.
* Input voltage 5V.
* Male burgstick connectors for supply, digit and segment connections.

It converts serial Tx and Rx from RS232 to TTL voltage signals and vice-versa. You can use to interface a robot or a microcontroller with serial interface with a computer with a RS232 Port.

This RS232 to TTL Conversion helps to connect any microcontroller with serial port, or to enable serial interface for your microcontroller based product design. It works on 5V DC.Board requires external 5V regulated power source. Rx, Tx, RTS, CTS & DTR signals are available for TTL (5V) interfacing. Use it with any standard baud rate (Best with 9600 baud rate).

This is a great battery-backed Real Time Clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalo -gging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC, and works best with 5V-based chips.

Single Channel Relay Board is a simple and convenient way to interface a relay for switching application in your project.

Features: * Input supply 12 VDC @ 42 mA
* Relay specification 5 A @ 240 VAC
* Trigger level 2 ~ 5 VDC
* Burg connector for connecting power and trigger voltage
* LED indicates relay status
* 3-pin burgstick for 12V supply, ground and input connection
* Screw terminal connector for easy relay output connection

In this board BC547B transistor is used to drive relay and diode 1N4148 is used to proctect transistor from the Back e.m.f. generated by the coil in relay.

The Solid State Relay Board features a high degree of isolation with the use of opto-isolators for isolation between control signals and output controls.

Fuse protection is also provided to protect the triac from overload. Heavy duty heatsink is used, as well as high current pcb terminal for easy connection to external output.

Easily switch and control a wide range of mains devices with this inexpensive, fast switching Solid State Relay Board.

Features: * Opto-Isolated For Improved Satefy and Reliability
* Heavy Duty, Fast Switching Triac Output, Suitable for up to 6A
* LED Indication of each Output State
* Fuse Protected Output
* Heavy Duty PCB Power Terminal Connection
* Standard +5V input for use with most microcontrollers and control systems
* Ideal for use in Industrial and Commercial Systems

The ULN2803 IC is an 8-channel High voltage High current Darlington Transistor Array. It allows us to interface TTL signals with higher voltage/current loads. This consists male burgstick connectors for supply, ground input and output connections. This is used to drive relays and require 12V supply.

The ULN2803 package is available from many manufacturers, you can download a datasheet at the link below.

This USB to serial converter is very useful where there is no physical RS232 port or COM port is available & you want to communicate with a system where only RS232 port is available. This converter presents itself to computer as if it is a COM port. It’s behavior is as good as a “real” COM port. All the data lines available to 9 pin actual COM port are brought out as a real port.

The software inside the converter not only emulates itself as a COM port but it also interprets the data from one standard- USB – to other that is RS232 standard.