![]() ![]() Basically, it consists of a LED that emits infrared light and a photosensor that detects it. It is used to maintain isolation between two electrical circuits like DC and AC signals. Optocoupler is also known as Optoisolator. ![]() In case we want to turn ON the device, we need to switch it ON completely i.e t1=0. For example, in this case, as the firing angle is 90 percent, hence the average power output will be halved. The time “t1” is the delay time which we have to give as per our application requirement. Here BT136 TRIAC is used for AC Pump Switch ON/OFF purposes.Īs shown in the figure above, the TRIAC is triggered at a firing angle of 90 degrees by applying a small gate pulse signal to it. In SCRs, it conducts in only one direction, but in the case of TRIAC, the power can be controlled in both directions. TRIAC is a three-terminal AC switch that can be triggered by a low-energy signal at its gate terminal. After the programming is over, the LED will turn off and the device is ready for use. Insert the same coin into the device 30 times in order to train the coin to memory.For example, if we want to program it for 2 Rupees coins, then we will insert only 2 Rupees coins while we program it. While the RED LED is on, insert the coin we want to program it for.First, press the push button located on the top and hold it for 4-5 seconds until the RED LED glows up, and then release it.To train the Module for a specific coin, follow the steps below: ![]() Using the 3rd switch, the precision of the device can be chosen. The second switch is used to set the signal to be +5 V(NC) or 0 V(NO) as shown in the figure. The first switch has three positions to select the impulse length. It also has three switches which we use in order to select the type of signal we want to get on the output. The coin acceptor device gives us an impulse signal on the output pin for every inserted coin and by counting impulses we know how many coins have been inserted. The device is easily programmed using a push-button located on the top. The coin accepting device has an inbuilt microcontroller that takes data from the sensor inside the device and collects different coins. Using this data, the microcontroller knows whether this coin needs to be accepted or returned. In this project, a single coin acceptor is used. Multi-coin coin acceptors can accept different coins with one machine, and output different signals to the microcontroller. A comparable type of coin acceptor is used to accept the coins that are similar to the coins put aside the coin acceptor. The Single coin acceptor is specially designed to accept only a specific coin. Coin acceptor modules are available in multiple categories including single coin acceptor, comparable type coin acceptor, multi-coin coin acceptor,etc. Similarly, a LED is connected to indicate the dispensing action.Ĭoin acceptor modules accept currency coins which can be suitable for various vending machines. Arduino receives the signal and gives the digital command to Opto isolator which triggers the TRIAC to switch ON/OFF the Water Pump for a specific duration. Components Required for Building a Drinking Water Vending Machine:Īs shown in the block diagram above, the Coin acceptor module acts as the input device which gives the signal to Arduino when it detects a valid Coin inserted within it. This Vending machine uses a single Coin Acceptor Module that accepts the currency coins, and TRIAC, and Optocoupler circuitry are used to dispense the water. In this project, we are going to build a Portable Drinking Water vending machine using Arduino which can be used in any public places such as tourism places to dispense drinking water or any other beverage using Currency coins. Vending machines appear in public and private areas such as malls, markets, offices, etc. It can dispense products such as beverages, tickets, snacks, etc. Vending machines are very popular nowadays due to their ease of use, multiple use cases, and no human intervention. ![]()
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