RNDMFG CHENNAI, Tamil Nadu

A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear). The two elements are also called the worm screw and worm wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit. Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. The image shows a section of a gear box with a worm gear driven by a worm. A worm is an example of a screw, one of the six simple machines. 1.      A gear consisting of a shaft with a spiral thread that engages with and drives a toothed wheel. 2.      The toothed wheel driven in this way. Worm gears are an old style of gear, and a version of one of the six simple machines. Basically, a worm gear is a screw butted up against what looks like a standard spur gear with slightly angled and curved teeth. It changes the rotational movement by 90 degrees, and the plane of movement also changes due to the position of the worm on the worm wheel (or simply "the wheel"). They are typically comprised of a steel worm and a brass wheel.

Wireless transmission and reception, Small size, Light weight, Low power consumption, High sensitivity, Easy to install, Operate, Easy to conceal.

Water Sensor water level sensor is an easy-to-use, cost-effective high level/drop recognition sensor, which is obtained by having a series of parallel wires exposed traces measured droplets/water volume in order to determine the water level. Easy to complete water to analog signal conversion and output analog values can be directly read Arduino development board to achieve the level alarm effect.

The lowest rated working voltage: DC4.5 5V-24V Maximum operating current: 15 mA (DC 5V) Working voltage range: DC 5~18 v Load capacity:  10 mA (DC 5V) or less  Use temperature: 80 Degree   or less Operating humidity range: 35%~90%RH (no frost) Allowing pressure: pressure 1.75Mpa Temperature: -25~+80 ° c External threads: 1/2" Kept under the temperature: - 25 ~ + 80 Degree   Keep humidity: 25% ~ 95% RH Attention: Taboo water or water vapor into the circuit board Apply to water heaters, credit card machines, water vending machine, and flow measurement device.

This module is based on resistance points pressure principle, and it can make the input voltage of red terminal reduce 5 times of original voltage. The max Arduino analog input voltage is 5 V, so the input voltage of this module should be not more than 5 V x 5 = 25 V ( if for 3.3 V system, the input voltage should be not more than 3.3 V x 5 = 16.5 V ). Because the Arduino AVR chip have 10 bit AD, so this module simulation resolution is 0.00489 V (5 V / 1023), and the input voltage of this module should be more than 0.00489 V x 5 = 0.02445 V. Special Parameters : 1?Voltage input range : DC0-25 V 2?Voltage detection range : DC0.02445 V-25 V 3?Voltage analog resolution : 0.00489 V 4?DC input interface : red terminal positive with VCC, negative with GND

We all know that there is a kind of module which can control the light on and off. You make a sound, the light turns on. Then after a while it turns off. This is not voice recognition. We may call it Sound Control. Voice recognition is something that knows exactly what you were saying. We've beening thinking about a module which helps to control other devices by voice and it will not cost too much. Finally we designed this module. Well, what can this module do? It can recognize as much as 15 voice instruction, which is suitable for most cases involving voice control.

The Vibration module based on the vibration sensor SW-420 and Comparator LM393 to detect if there is any vibration that beyond the threshold. The threshold can be adjusted by the on-board potentiometer. When this no vibration, this module output logic LOW the signal indicate LED light, And vice versa. No shock, vibration switch was closed conduction state, output of low output, the green indicator light. Shock, vibration switch instantly disconnected, the output-side output high, the green light does not shine. The output can be directly connected to the microcontroller through the microcontroller to detect high and low, thereby detecting whether the vibration environment, played the role of the police. FEATURES Using SW-420 normally closed type vibration sensor. The comparator output signal is clean, good waveform, driving ability, more than 15Ma The working voltage of 3.3V-5V The output format: digital switching outputs (0 and 1) A fixed bolt holes for easy installation Small PCB board size: 3.2cm x 1.4cm Using a wide voltage LM393 comparator

Little circuit for your USB charger projects and onboard USB device supply solutions. (ie  GoPro cameras) You can supply it with single cell LiPO or an AA size batter or others. Great Step-up Module with 0.9-5V input, output 5V for many digital devices, so this is really a great module for designing a portable charger. Useful for your USB charger projects and onboard USB device supply solutions. (ie  GoPro cameras) You can supply it with single cell LiPO or an AA size batter or others.  If you need higher current , please check our 2.5v-5v to 5v 1000ma StepUp Module T wo AA batteries it can output current of 500 ~ 600MA, a single AA battery power supply can output 200ma current supply, great for mobile phones camera, single-chip, digital products supply. this module output power affected by itself load capacity ,also affected by the fore power and after load level etc.numbers of factors; the following data for professional equipment measureing results, regardless of other factors. Power supply module is an electronic component, persons without electronic expertise to buy carefully. Input mode: IN+ input positive, IN-input negative Output mode: standard USB 1 small PFM control DC / DC boost controller chip onboard 2, any DC voltage input 0.9V ~ 5V, output 5V DC voltage can be stable, with two AA batteries input to the output current of 500 ~ 600MA single AA battery power supply output current 200ma about for mobile phones camera, single-chip, digital products supply. Stable output 5V DC voltage 3 onboard USB female, can be directly powered USB interface device with USB female, versatile 4 on-board input voltage indicator 5, PCB size: 34 (mm) x16.2 (mm) ultra-small size, installed in a variety of small equipment Shipping list: 5V boost module x 1

The ML8511 sensor breakout is an easy to use ultraviolet light sensor. The MP8511 UV Sensor outputs an analog signal in relation to the amount of UV light it detects. This can be handy in creating devices that warn the user of sunburn or detect the UV index as it relates to weather conditions. This sensor detects 280-390nm light most effectively. This is categorized as part of the UVB (burning rays) spectrum and most of the UVA (tanning rays) spectrum. The ML8511 sensor is very easy to use. It outputs a analog voltage that is linearly related to the measured UV intensity (mW/cm2). If your microcontroller can do an analog to voltage conversion, then you can detect the level of UV. Next, connect the following ML8511 breakout board to Arduino: LAPIS Semiconductor developed the UV sensor ( ML8511A ) to detect a ultra violet rays with Si ( silicon ) device using the original SOI ( silicon on insulator ) technology. The ML8511A measures the amount of ultra violet rayses contained in sunlight, and it is used for the equipment which displays the suntan by a ultra violet rays, the guidance for UV care of skin, etc.  The ML8511A is ideal for mobile computing devices, such as a smart phone, a mobile phone, and a watch, at low power and a compact package (QFN).

The US-020 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). Ultrasonic Ranging Module US-020 provides 2cm-700cm non-contact distance sensing capabilities, Ranging accuracy up to 3mm; module comprises an ultrasonic transmitter, a receiver and a control circuit.

The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly-proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracies The LM35 datasheet specifies that this ICs are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in ? Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Centi-grade scaling. The LM35 does not require any external calibration or trimming to provide typical accuracies of ±1⁄4?C at room temperature and ±3⁄4?C over a full −55 to +150?C temperature range. You can measure temperature more accurately than a using a thermistor. The sensor circuitry is sealed and not subject to oxidation, etc. The LM35 generates a higher output voltage than thermocouples and may not require that the output voltage be amplified. It has an output voltage that is proportional to the Celsius temperature. The scale factor is .01V/oC The LM35 does not require any external calibration or trimming and maintains an accuracy of  +/-0.4 oC at room temperature and +/- 0.8 oC over a range of 0 oC to +100 oC. Another important characteristic of the LM35DZ is that it draws only 60 micro amps from its supply and possesses a low self-heating capability. The sensor self-heating causes less than 0.1 oC temperature rise in still air.         The LM35 comes in many different packages, including the following. TO-92 plastic transistor-like package, T0-46 metal can transistor-like package 8-lead surface mount SO-8 small outline package Features Calibrated directly in o Celsius (Centigrade) Linear + 10.0 mV/oC scale factor 0.5oC accuracy guaranteeable (at +25oC) Rated for full −55o to +150oC range Suitable for remote applications Low cost due to wafer-level trimming Operates from 4 to 30 volts Less than 60 µA current drain Low self-heating, 0.08oC in still air Nonlinearity only ±1⁄4oC typical Low impedance output, 0.1 Ω for 1 mA load

A4988 is a complete microstepping motor driver with built-in translator for easy operation. The product can be full, half, 1/4, 1/8 and 1/16 step mode to operate bipolar stepper motor output drive capacity of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator, the regulator can slow or mixed decay mode. The converter is the key to the easy implementation of the A4988. In inputting one pulse on the STEP input drives the motor one microstep. No phase sequence tables, high frequency control lines, or complex interfaces to programming. A4988 interface is very suitable for complex microprocessor is unavailable or is overburdened.         Micro-step operation, the chopping control in the A4988 automatically selects the current decay mode (Slow or Mixed). In the mixed decay mode, the device is initially set to fast decay in the part of the fixed off-time, then a slow decay in the rest of the downtime. Mixed-decay current control scheme results in reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry to improve the pulse-width modulation (PWM) power consumption when operating. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power-Sort. A4988 surface mount QFN package (ES), the size of 5 mm x 5 mm nominal overall package height of 0.90 mm, and with exposed pad for enhanced thermal dissipation. The package is Pb (suffixes-T), with 100% matte tin leadframe plating. A stepper motor is one kind of electric motor used in the robotics industry. Stepper motors move a known interval for each pulse of power. These pulses of power are provided by a stepper motor driver and is referred to as a step. As each step moves the motor a known distance it makes them handy devices for repeatable positioning. There is a good article on Wikipedia explaining the technology behind stepper motors. The mechanical operation of a stepper motor is shown in this article.

5 Line 4 phase can be driven by ordinary uln2003 chip can also be connected in phase 2 development board used for supporting the use of a direct plug and easy to use stepper motor used in the development board. High quality

Voltage : 5V

Step Angle : 5.625 x 1 / 64

 In = 2-24V / Out = 5-28V @ 2A Switching Regulator (Boost = Output Voltage has to be higher than input voltage), Good for getting stable 3.3V or 5V output from 1xAA or 2xAA or Li-ion batteries A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage. It is a class of switched-mode power supply (SMPS) containing at least two semiconductors (a diode and a transistor) and at least one energy storage element, a capacitor, inductor, or the two in combination. Filters made of capacitors (sometimes in combination with inductors) are normally added to the output of the converter to reduce output voltage ripple. The key principle that drives the boost converter is the tendency of an inductor to resist changes in current by creating and destroying a magnetic field. In a boost converter, the output voltage is always higher than the input voltage. A schematic of a boost power stage is shown in Figure 1. (a) When the switch is closed, electrons flow through the inductor in clockwise direction and the inductor stores some energy by generating a magnetic field. Polarity of the left side of the inductor is positive. (b) When the switch is opened, current will be reduced as the impedance is higher. The magnetic field previously created will be destroyed to maintain the current towards the load. Thus the polarity will be reversed (means left side of inductor will be negative now). As a result two sources will be in series causing a higher voltage to charge the capacitor through the diode D. The MT3608 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The MT3608 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life. The MT3608 features automatic shifting to pulse frequency modulation mode at light loads. The MT3608 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MT3608 is available in a small 6-pin SOT-23 package.

The Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude. The 3 outputs are simultaneous and independent, so you can use as many or as few as you want at once. The envelope output allows you to easily read amplitude of sound by simply measuring the analog voltage. Gain can be adjusted with a through-hole resistor, to change the threshold of the binary (gate) output pin as well. Check the hookup guide below for more information about setting gain.  Each of the three output signals is present on the .1" header at the edge of the board. They are active simultaneously. If you aren’t using one in your particular application, simply leave that pin disconnected.

A solenoid valve is an electromechanically operated valve.  The valve is controlled by an electric current through a solenoid : in the case of a two-port valve the flow is switched on or off;  in the case of a three-port valve, the outflow is switched between the two outlet ports.

·         A smart card reader is an electronic device that reads smart cards. ·         Contact Smart card reader: ·         A smart card, chip card, or integrated circuit card (ICC) is any pocket-sized card with embedded integrated circuits. ·         Contactless Smart card reader: ·         A contactless smart card is any pocket-sized card with embedded integrated circuits that can process and store data, and communicate with a terminal via radio waves. There are two broad categories of contactless smart cards. Memory cards contain non-volatile memory storage components, and perhaps some specific security logic. Contactless smart cards do not contain an ordinary read-only RFID, but they do contain a re-writeable smart card microchip that can be transcribed via radio waves.  Along with the rapid growth of technology comes the increasing prevalence of electronic data theft. This emphasizes the need to secure electronic data, thus necessitating the integration of smart card technology into current IT infrastructures. Following this trend, the ACR38 Smart Card Reader Series combines sophisticated technology and modern design to meet stringent requirements in smart card-based applications, such as payment systems and electronic identification, where a high level of security has increasingly been deemed essential. Being compliant with the CCID specification, the ACR38 Series offers a plug-and-play solution that eliminates the need for driver installation and driver-system compatibility assessment. Its USB interface facilitates communication between a computer and a smart card very easily, allowing for a seamless implementation of smart-card based applications in a PC environment.

CCPM Servo Consistency Master / Servo tester The device also can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver. There are 3 modes to check servos or ESC Manual mode: turn the knob with different speed, check the reaction time. Neutral mode: make the servo go back to the neutral point. Automatic "window wiper" mode: make the servo swing like a window wipers in the biggest angle.It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on. You can also connect 1-3 ESC to test and compare their reaction time respectively. It can connect 3 servos of the CCPM helicopters and select servos.It can also connect the servo of airplanes install the steering-box and adjust planes by using such as the neutral mode and so on.