Tachlog Pvt Ltd Thiruvananthapuram, Kerala

A water level indicator is used to indicate the level of water in an over head tank. This keeps the user informed about the water level at all times and avoids the situation of water running overflow. Four LEDs to indicate the 4  different water level positions through BC547.   S1,S2,S3 and S4 are the four probes for different positions of water tank. When any of the probes touches the water circuit will be closed and voltage coming to the base of the transistor(the base current Ib get increased by current passing through the water), LED goes ON. So easily we can understand water in the tank is in corresponding water position. 100k Resistor is used to pull-down the base of the transistor(Not to produce false result). If direct Vcc voltage coming into the base of the transistor,It may affect the transistor(So 1k is provided series to the base to limit the base current to micro amperes ).

A water level indicator is used to indicate the level of water in an over head tank. This keeps the user informed about the water level at all times and avoids the situation of water running overflow. Four LEDs to indicate the 4  different water level positions through BC547. S1,S2,S3 and S4 are the four probes for different positions of water tank. When any of the probes touches the water circuit will be closed and voltage coming to the base of the transistor(the base current Ib get increased by current passing through the water), LED goes ON. So easily we can understand water in the tank is in corresponding water position. 100k Resistor is used to pull-down the base of the transistor(Not to produce false result). If direct Vcc voltage coming into the base of the transistor,It may affect the transistor(So 1k is provided series to the base to limit the base current to micro amperes ).    

Input Voltage 4.5V - 8VPackage SOT223Output Current 800mAOutput Voltage 3.3V

The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do. It offers excellent range accuracy and stable readings in an easy-to-use package. The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do. It offers excellent range accuracy and stable readings in an easy-to-use package. It operation is not affected by sunlight or black material like Sharp rangefinders are (although acoustically soft materials like cloth can be difficult to detect). Similar in performance to the SRF005 but with the low-price of a Sharp infrared sensor.   Power Supply :5V DC Quiescent Current :

  5V Power Supply for Transformer DIY Kits (Not Soldered)   A good regulated AC to DC power supply circuit is essential for any electronic products. Microcontrollers require a 5V DC supply, so the AC 230V needs to be converted into 5V DC using the step-down converter in their power supply circuit.   Circuit consists of 4 parts: Step down transformer, bridge rectifier, capacitor filter and voltage regulator IC. The transformer step downs the high voltage AC to a low voltage AC. W10 (Bridge rectifier) internally consists of four diodes which are connected in the form a bridge. We know that the diode is an uncontrolled rectifier which will conduct only forward bias and will not conduct during the reverse bias. Output of the W10 will get 15v DC. 15V DC can be regulated into 5V DC using 7805 IC, but before this, it is required to obtain pure DC power. The output of the W10 bridge rectifier is a DC consisting of ripples also called as pulsating DC. This pulsating DC can be filtered using a capacitor filter for removing the ripples. The Capacitor input increases from zero to a peak value and, while the supply voltage decreases from peak value to zero, capacitor starts discharging. This charging and discharging of the capacitor will make the pulsating DC into pure DC.     7805 is a voltage regulator integrated circuit. It is a member of 78xx series of fixed linear voltage regulator ICs. Which restricts the voltage output to 5V. It comes with provision to add heatsink.The maximum value for input to the voltage regulator is 35V. It can provide a constant steady voltage flow of 5V for higher voltage input till the threshold limit of 35V. Again Filter circuit is added to eliminate remaining ripples. When Output 5v is came, LED will glow. This circuit can connect any of power supply sections if regulated 5v is needed.

  5V Power Supply for Transformer DIY Assembled and Tested Kits A good regulated AC to DC power supply circuit is essential for any electronic products. Microcontrollers require a 5V DC supply, so the AC 230V needs to be converted into 5V DC using the step-down converter in their power supply circuit. Circuit consists of 4 parts: Step down transformer, bridge rectifier, capacitor filter and voltage regulator IC. The transformer step downs the high voltage AC to a low voltage AC. W10 (Bridge rectifier) internally consists of four diodes which are connected in the form a bridge. We know that the diode is an uncontrolled rectifier which will conduct only forward bias and will not conduct during the reverse bias. Output of the W10 will get 15v DC. 15V DC can be regulated into 5V DC using 7805 IC, but before this, it is required to obtain pure DC power. The output of the W10 bridge rectifier is a DC consisting of ripples also called as pulsating DC. This pulsating DC can be filtered using a capacitor filter for removing the ripples. The Capacitor input increases from zero to a peak value and, while the supply voltage decreases from peak value to zero, capacitor starts discharging. This charging and discharging of the capacitor will make the pulsating DC into pure DC.     7805 is a voltage regulator integrated circuit. It is a member of 78xx series of fixed linear voltage regulator ICs. Which restricts the voltage output to 5V. It comes with provision to add heatsink.The maximum value for input to the voltage regulator is 35V. It can provide a constant steady voltage flow of 5V for higher voltage input till the threshold limit of 35V. Again Filter circuit is added to eliminate remaining ripples. When Output 5v is came, LED will glow. This circuit can connect any of power supply sections if regulated 5v is needed.

  This breakout board for TI’s DRV8825 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and six microstep resolutions (down to 1/32-step). It operates from 8.2 V to 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (rated for up to 2.2 A per coil with sufficient additional cooling).

  Solder Flux 100g AMTECH NC-559-ASM(Blue)   It can be used for rework, sphere or pin attachment to BGA, PGA and CSP packages, and assemble operations such as Flip Chip attachment to PWB substrates. It is a necessary and helpful tool in BGA reballing.

  RF Encoder & Decoder 433Mhz Interfacing board with HT12D & HT12E IC chips.   The module is for wireless communication of digital data. The module consist of board for RX. Module can encrypted  by 8 bit key.   Easy interfacing with the RF modules, using the female headers for placing the modules. Breakout pins for connecting to the microcontroller. Small size, high quality PCB.

Reverse voltage 50 to 1000 Volts; forward current -1.0 Ampere The plastic package carries Underwriters Laboratory Flammability Classification For surface mounted applications Low reverse leakage Built-in strain relief, ideal for automated placement High forward surge current capability

Sony NiMH rechargeable batteries last 3 times longer in high drain devices than Alkaline batteries. Recharge, reuse, recycle, Sony rechargeable batteries offer economical and environmentally friendly lifestyle. Ideal for high drain devices such as digital cameras and IC recorders.

Features:-          Dual bi-directional motor control using L298 dual H-bridge          Socket for HC-SRo4 Ultrasonic sound sensor.          Open Source Python Software library.          Socket for two servo motors (Pan & tilt).          Reverse polarity protection          Screw terminals for motors and battery          Comprehensive and easy to use Python library          Variable (PWM) power control. This allows you to both control the speed of the motors independently and use lower voltage motors

A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. PIR sensor detects the infrared light radiated by a warm object. It consists of pyro electric sensors which introduce changes in their temperature (due to incident infrared radiation) into electric signal. When infrared light strikes a crystal, it generates an electrical charge. It will detect the motion via positive and negative differential changes in the both halves of the output. It won’t detect decaying light changes(slow moving light waves). There is no need of calibration for daylight.Most PIR sensors have a 3-pin connection at the side or bottom. One pin will be ground, another will be signal and the last pin will be power. Power is usually up to 5V.   Applications:- Automatic Door Opening System Security Alarm System.

  Requiring no tools for assembly, spacers/supports snap-in to produce a strong dependable grip. Easily installed and reusable for repairs, spacers/supports lock-fit to the chassis and either lock-fit or tension-fit to the PCB.

      L293D Motor Driver The L293D is a monolithic integrated high voltage, high current four channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads (such as relays solenoides, DC and stepping motors) and switching power transistors. Features: ·        Light weight, small dimension ·        Super driver capacity ·       Two enable inputs are provided to enable or disable the device independently of the input signals ·        2 DC motor/ 4 coil dual phrase stepper motor output ·           4 standard mounting holes     Specifications:   Driver: L293D   Driver power supply: +7V ~ +36V   Driver peak current: 1.2A   Logic power output Vss: +5 ~ +7V (internal supply +5V)   Max drive power: 5W   Working temperature: -40 oC ~ +150 oC   Dimension: 50mm x 40mm x 20mm (l x b x h) Pin configurations:   Double H driver module can drive two DC motors at the same time. The board has a total of 7 pins.  

  Reprap pololu A4988 Stepper Motor Driver This Module is a carrier board or breakout board for Allegro A4988 Microstepping Driver with Translator and Overcurrent Protection. It operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling).  

  It can check 1S-8S lipoly battery, Li-ion, LiMn and Li-Fe batteries, automatically displays the voltage of each cell and the total voltage, reversed polarity protection. It can check out the battery working state at any time to protect the battery from over discharging or over charging.When the voltage is below the standard setting voltage, the alarm will buzz and the red LED light is on. Default is 3.3V, you can change the default voltage.

  Light Dimmer DIY Kits (Not Soldered) A light dimmer works by essentially chopping parts out of the AC voltage. As the AC supply voltage increases at the beginning of the cycle, capacitor, C is charged through the series combination of the fixed resistor, R1 and the potentiometer, VR1 and the voltage across its plates increases. Once the triac has been fired into conduction, it is maintained in its “ON” state by the load current flowing through it, while the voltage across the resistor–capacitor combination is limited by the “ON” voltage of the triac and is maintained until the end of the present half-cycle of the AC supply. At the end of the half cycle the supply voltage falls to zero, reducing the current through the triac below its holding current, IH turning it “OFF” and the diac stops conduction. The supply voltage then enters its next half-cycle, the capacitor voltage again begins to rise (this time in the opposite direction) and the cycle of firing the triac repeats over again.

  18650 Li-Ion battery pack 8.2V (2S)   Li-Ion Battery Packs 2S 2500 mAh for Robotics Projects This high performance Li-Ion Battery pack is specifically manufactured to be used Robotics Projects. The battery has XT terminal connectors for easy removing battery. The battery has a balance charger port for Safe and efficient charging    Specifications     Capacity: 2200mAh     Weight: 100 gms     Configuration: 2S1P / 7.4v / 3Cell     Pack Size: 65x 35 x 18mm     Charge Plug: JST-XH(3-pin)     Discharge Plug: Deans Style XT Plug Nylon T Connector Male/Female   Advantages over traditional batteries         Light weight     Good look     Stable High pack voltage through duration of use.     Maintains higher pack capacity even after many cycles of use     Longer Cycle Life

Weight : 100 gms

A Light Dependent Resistor (LDR) or a photo resistor is a device whose resistivity is a function of the incident electromagnetic radiation. Hence, they are light sensitive devices. Photo conductivity is an optical phenomenon in which the materials conductivity is increased when light is absorbed by the material.   LDR’s are light dependent devices whose resistance is decreased when light falls on them and that is increased in the dark. When a light dependent resistor is kept in dark, its resistance is very high. This resistance is called as dark resistance. We can adjust the dark resistance by pot. We can take the output from this board digital as well as analog value. LDR’s have low cost and simple structure. They are often used as light sensors. They are used when there is a need to detect absences or presences of light like in a camera light meter. Used in street lamps, alarm clock, burglar alarm circuits, light intensity meters, for counting the packages moving on a conveyor belt, etc. Features Can detect ambient brightness and light intensity Adjustable sensitivity (via blue digital potentiometer adjustment) Operating voltage 3.3V-5V Output Type Analog voltage output -A0 Digital switching outputs (0 and 1) -D0 With fixed bolt hole for easy installation Small board PCB size: 3cm * 1.6cm Power indicator (red) and the digital switch output indicator (green) Using LM393 comparator chip, stable  

  16x2 LCD Display LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. A 16x2 LCD display is very basic module and is very commonly used in various devices and circuits. A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD has two registers, namely, Command and Data.The command register stores the command instructions given to the LCD. A command is an instruction given to LCD to do a predefined task like initializing it, clearing its screen, setting the cursor position, controlling display etc. The data register stores the data to be displayed on the LCD. The data is the ASCII value of the character to be displayed on the LCD. Click to learn more about internal structure of a LCD.      FEATURES 5 x 8 dots with cursor Built-in controller (KS 0066 or Equivalent) + 5V power supply (Also available for + 3V) 1/16 duty cycle. B/L to be driven by pin 1, pin 2 or pin 15,pin 16 or A.K (LED).

  MAX6675 K-type Thermocouple 0-800   100% brand new and high qualityWith cold port compensationConvert K, J, N, T or E-type thermocouple signal into digital dataOutput 14Bit dataResolution: 0.25°CHighest Temperature: +1800°CLowest Temperature: -270°CFor K-type thermocouple, temperature range -200°C~+700°C, +/-2°C precision   Note:-1.Works with any K type thermocouple2 K thermocouples have about ±2°C to ±6°C accuracy4.Internal temperature reading5.3 to 5v power supply and logic level compliant!6.SPI data output requires any 3 digital I/O pins.

This is a multipurpose infrared sensor which can be used for obstacle sensing, line sensing, etc. and also as an encoder sensor. This is a multipurpose infrared sensor which can be used for obstacle sensing, line sensing, etc. and also as an encoder sensor. The sensor provides a digital output. The sensor outputs a logic one (+3.5V) at the digital output when an object is placed in front of the sensor and logic zero (0V), when there is no object in front of the sensor. An onboard LED is used to indicate the presence of an object. This IR PROXIMITY/ OBSTACLE SENSOR is designed to work with almost all ARDUINO boards and Microcontrollers - AVR, PIC, 8051, ARM etc. Operating Voltage: 5V Adjustable Range using preset (potentiometer on board) Since the sensor module works on INFRARED, for obstacles with reflective surfaces (white colored), the maximum range will be higher and for non-reflective surfaces (black colored), and the maximum range will be lower. This can in turn be used for detecting white/black lines (in line follower ROBOTs) or bright/dark objects (in object identification ROBOTs) Useful for various Robotic Applications, Room Visitor Counter Systems, etc.  

  DHT22 Sensor (Humidity and Temperature)   The DHT22 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin. Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the right most pin to ground. Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and more expensive.Features    Low cost    3 to 5V power and I/O    Good for -40 to 125°C temperature readings ±0.5°C accuracy    Good for 0-100% humidity readings with 2-5% accuracy