Arduino coin counter code


  • DIY Coin Sorting and Counter
  • How to build a Coin-Operated timer with a display interface
  • Recent Posts
  • 13 Best Arduino Projects
  • DIY Coin Sorting and Counter

    Pin It This circuit provides timed access to pay services such as games, showers, blows dryers and various types of vending machines, thanks to a coin counter and a display interface. Typically, each impulse activates the distribution of a product from a vending machine or the opening of a window or door, but also the faucet of a shower, a hairdryer or a service in a self-service car wash, access to the keyboard of a public computer or a public phone and so on.

    However, there are situations where, instead of an impulse, we would need a timing feature to start when the coin or the series of corn composing a fare is introduced; this is why we thought of developing the project we are going to describe here. This apparatus recognizes coins from one cent up to 2 euro passing through intermediate measures and provides, on a serial or parallel interface, the information, related to the acquisition of every single piece.

    In order to convert information provided by the coin-operated device into a specific timing we have created an interface board Fig. The interface board The coin-operated device used has two interfacing modes: serial and parallel; the first one, sends a set number of impulses on a dedicated output line according to the coin inserted, while in the parallel mode the one used in our project it takes advantage of a 6-pin interface, with each of the pins representing a group of coins.

    In this case, the pin corresponding to the recognized coin is earthed whenever a coin belonging to a group is inserted. The board we have combined with the coin-operated device you can see to two units connected in Fig. The keys, the dip-switch and the display constitute the user interface, while the coin device is the block labelled U4 in the circuit diagram.

    As with all the latest microcontrollers by Microchip, this can work between 1,8 and 3. In fact, once a certain timing has been launched the system will no longer consider signals provided by the coin-operated device, therefore the added cash would be ignored.

    As for lines RB6, RB7, RE3, dedicated to reading keys P1, P2 and P3, we have connected each one to an external pull-up resistor which ends on the positive side of the 3. These lines of the microcontroller, since they cannot have an internal pull-up, are also equipped each one with an external resistor connected to 3,3V they are R15, R16, R17 and R For what concerns the bidirectional line, the functioning of this translator is like this: when SDA is at high level 5 V thanks to the pull-up resistor R2, the Q1 MOSFET is in interdiction and R1 resistor keeps pin 19 of the microcontroller at 3.

    The clock can work both following the 12 or hour format, with an indication for a. Besides that, the DS has a programmable clock output that provides a square wave obtained by the clock frequency of the clock which is in turn determined by the 32, kHz quartz connected to pins 1 and 2 which, through a dedicated internal divider, can be reduced to 1 Hz, kHz, kHz it can also provide the whole clock. The DS also has a control circuit which can check the lack or insufficiency of main power Vcc and make so that the voltage needed for its functioning is taken from the backup battery; in our case, it is a 3 V CR button battery BAT1 , guaranteeing an autonomy of around 6 months in case of no power and which is between pin 3 VBAT and ground pin 4, which is GND.

    The power control section is sized in order to carry out two tasks: preserving memory in which current time and date are saved and keeping the watch counter ticking. The first task is carried out by preserving the corresponding information in the non-volatile RAM, while the second one is carried out by the backup power taken from the battery connected between pins 3 and 4.

    The protection intervention takes place when the voltage read between the main power pin 8 and ground 4 is 1. When RA7 goes to logic level high, it puts T2 into saturation, which powers through its collector the coil of the RL1 relay; same goes for RE2, which puts T3 into saturation when it goes to logic one, which in turn pilots the activation of the RL2 relay.

    Finally, we can see lines RD2, RD3, RD4, RD5 connected to CNOUT connector, which is an interface not handled by the firmware at the moment, available for future developments; the 1 contact of that connector is reserved for powering devices and circuits that may be connected to the board, and it can be set at 5 or 12 V according to how JOUTV Jumper is set. In the power chain, we then have a second regulator, U2, which is a low drop-out type LDV33 providing the stabilized 3,3 V used to power the microcontroller, the jumpers and the dip-switches surrounding it.

    Below you can find the corresponding functions. Sound alarm function: when activated, it allows to get a sound signal while still under the time limit in order to notify the user that the allotted time is running out. Anti-blackout function: when activated, it allows to save the timer countdown in the memory, this way in case of a blackout, the user will not lose credit since they will be able to use it again once the power comes back.

    The JPR jumper is used to select the functioning mode: if closed, it enables programming mode, while it activates normal usage when it is open. In case of the close jumper, if you press P1 it will access the time configuration which, although not of major importance, might be useful in some installations. Table1 If, on the other hand, you press P3 with the jumpers still closed, you will be able to configure the activation time for the sound notice and all the timers of each group.

    The first configuration to make is the signal timer 10 — 50 seconds. In order to change the value, you can press P1 or P2 to decrease or increase the time shown, while by pressing P3 you would confirm your settings and pass to the next configuration, which is the timer for group 1. Each timer shows, in order, hour, minutes and seconds configuration. You can switch from one to the other by confirming the setting, therefore by confirming the hour, you will pass to minutes and then seconds.

    Once you are done setting the 6 timers, everything is ready to be used. On the control board, there are other connectors and jumpers that might be useful. Once you are done with your configuration, you can open the JPR jumper to prevent the user from accidentally access settings.

    Now you can connect the coin-operated box to the control board. In order to connect it, you will not use the 5-terminal connector, therefore you can disconnect that connector from the coin-operated box. We also remind you that the P3 button during normal functioning therefore not in setting mode allows to pause the timer and reactivate it whenever desired, since the timer will be frozen until P3 is pressed again.

    If the key is pressed before inserting the coins, it will pause the timer, allowing anyway to charge credit and activate the output only when you are ready by pressing once again.

    Fingerprint Door Lock Forget your keys again? Ever wish you can just simply unlock your door by scanning your fingerprint? If so, then this Arduino project is the perfect device for you.

    Gone are the days when only the rich can afford biometrics door locks. Nowadays, you can create your fingerprint door lock without spending a fortune. Other than your Arduino Uno , you just need to purchase a few things like a fingerprint sensor to accomplish this project. It is an easy device to make at home. More so, you no longer have to write your own code because you can just easily download the library from Github. Several do-it-yourselfers have already tried and successfully did this project many times.

    So you can just simply browse the web for step-by-step guides or instructional videos. You would not have to worry about forgetting your keys again! Laser Tripwire Alarm If you watched any action movies in your lifetime, then chances are you might already be familiar with this project. In any heist or spy movie, there is always a scene where the actor has to pass through several laser security systems. Turns out, you can also have that type of laser security system with just a few bucks.

    You can either put it inside your house to prevent break-ins or in your backyard to avoid squirrels and any animals from ruining your lawn. It is a fun and simple project to make for all beginners out there. And once you completed the project, you can still customize it and add other security features. For instance, you can set up a passcode so that you would be the only one who can stop the alarm. Adding a passcode would make this laser security system more secure.

    Furthermore, you can complete the project using one of our project enclosures. Wristwatch Walkie Talkie This project is like the cool and upgraded version of a walkie-talkie.

    Rather than carrying a hand-held transceiver, you can now wear it instead. Aside from being a perfect gift for your kids, you can also use this walkie-talkie with your friends. If you are planning to hike up the mountains with your friends and family, then this wearable device would surely come in handy. Since this is a two-way radio transceiver, you need an Arduino board for each wristwatch. You also need a great construction base since you would be wearing this device.

    Thankfully, there is a mini breadboard already available in the market that would perfectly fit in your wristwatch. Without a doubt, your kids would be impressed with this gift and you can even use it to play with them. Or, if that is not the case and you are just a kid at heart, then you can use this to emulate and play like the Power Rangers with your friends. Lie Detector A polygraph machine or a lie detector is a great party game that would surely impress your friends.

    Even though all lie detectors are not fully accurate, there is still some sense of truth and honesty in this device. Before buying any Arduino board for this project, you have to take into account that you need to send the computer the data in order to effectively read it. So in that case, your Arduino board has to have a serial communication chip. You can take a look at To make this project a lot easier to accomplish, a good rule of thumb is to pick an Arduino board that already has a USB communication chip.

    This way, you would not have a hard time downloading more libraries and buying additional materials, cords, cables, etc. Rather than turning your keys in the doorknob, you can just unlock any door with a single swipe or tap of a card. Aside from the biometrics door lock that we have mentioned before, you can also make an RFID security system with your Arduino board.

    Since this project is really easy and cheap to make, several do-it-yourselfers already tried this successfully before. This project is well-documented by hobbyists so a quick Google search about the instructions would simply do the trick. So no more fumbling with your keys anymore! You can now just tap your card to unlock your front door. World Clock If you have friends, family, and colleagues abroad, then this project is a great addition to your home or office. Through this project, you can now check the time in other countries without opening your phone and accessing the internet.

    This wall-mounted timepiece is a perfect fixture for any house or office. On top of that, it is a cheap and easy project to make. You do not need any complex programming or coding skills in order to successfully make this project.

    More so, you can just download the library online and just load it into your Arduino board. Since this is a timepiece display, you need to buy a digital display screen as well. Hobbyists who successfully finish this project recommend using Arduino Uno as well as Arduino Nano for better display and power source. For a more seamless and clean-looking project, you can also buy a solderless breadboard with jumpers to make the project a lot easier.

    Social Distancing Sensor Physical distancing is now a necessary protective measure to prevent the spread of the virus. Made necessary by the ongoing pandemic, this project would surely come in handy if you are a business owner or you frequently go outside. This social distancing sensor would trigger an alarm if someone is sitting or standing too close to you. If you are running a business during this pandemic, then this device is a must-have in your store. This project is affordable and easy to make.

    Almost all the materials can be brought from any electronic store. Aside from your Arduino board, you just need a sensor, breadboard, jumpers, wires, and an LED. But if you want to, you can also add a sound alarm to make this device even more effective. Zoom Control Box Since most of us are working from home, Zoom and other conference calls have now become part of our everyday life.

    Whether you are a meeting host or just an attendee, things have become quite hectic, and meeting with your colleagues has never been more stressful.

    That being said, professionals and hobbyists have come up with several fun ways to make Zoom calls more convenient. It might seem like an extra step from just clicking join or end call-in your computer screen, but it has been proven to make you more productive and effective in work. You just need to download the libraries online for the code. Given that several people have already tried this project, searching and downloading the code for this project is not that difficult.

    Or just simply polish your skills in chess? Then, you should really consider making your own digital chessboard. Apart from your love of doing DIY projects, you can also make something that would benefit you. This project would not just help you polish your skills in chess but would also let you put into practice your knowledge in programming.

    Since chess is a calculative game, you need to be able to know algorithms, programming, and coding to accomplish this project. For this project, most hobbyists recommend Arduino Compatible Mega because it is more convenient and it has an operative memory, unlike other Arduino models.

    Since this is a digital chessboard, you also need to purchase a digital display screen to make this project work. To fully simulate an actual chess game, you can also include a buzzer and timer. Although this project would require a lot of work, it is still worth it in the end.

    Parking Assistant Parking is always the hardest part of driving. Since your view from the driver seat is limited, it is often difficult to know if you are parking a little bit too far in or out of the garage. With the help of this device, you would be able to park your car in the best position possible.

    Apart from your Arduino board, the other materials are also cheap and accessible. In addition, you can also get the Arduino Basics Starter Kit that includes everything that you would need. As for the library, you just need to download it online and load it into your Arduino IDE. Several people have already attempted to do this so the code is not that difficult to find. Coin Sorting Machine If you are currently running a business, then you might want to consider adding a coin sorting machine.

    Aside from the usual cash register, this machine is perfect for retail and service businesses that welcome several customers every day. Since employees can be overwhelmed with a lot of customers, they sometimes have a hard time differentiating coins, especially if they are working in a fast environment like retail.

    That being said, this coin sorting machine would make their job a lot easier. Professionals and hobbyists commonly use the Arduino Uno model for this project. They especially recommend this model for processing data and showing the count value of the coins. To create the divider, you can simply use cardboard just like the one above or you can use acrylic plastic for sturdiness as well as a better finish.

    Musical Instrument As with any microcontroller and development board, you can also create a number of instruments in your Arduino board. If you browse through several forums online, you would find that a lot of people have already created a variety of musical instruments with their Arduino boards.

    One of the most interesting musical instrument projects is the Theremin. It is an early electronic musical instrument created in the early s.

    Since this is not a touch instrument, you would need to buy an ultrasonic sensor. Nevertheless, the theremin is an easy-to-build musical instrument that does not necessarily require in-depth knowledge in several programming languages. Smoke Detector This is one of the most recommended projects for Arduino boards.

    Since smoke detectors are often costly, building this project for your home would save you a lot of money. Aside from your Arduino board, you also need a smoke detection sensor and a buzzer to accomplish this project. Conclusion Hopefully, we managed to cover a few projects that spark your interest. All in all, the projects below are just some of the most common and popular Arduino projects already done before.

    Thankfully, there is a mini breadboard already available in the market that would perfectly fit in your wristwatch. Without a doubt, your kids would be impressed with this gift and you can even use it to play with them.

    How to build a Coin-Operated timer with a display interface

    Or, if that is not the case and you are just a kid at heart, then you can use this to emulate and play like the Power Rangers with your friends. Lie Detector A polygraph machine or a lie detector is a great party game that would surely impress your friends.

    Even though all lie detectors are not fully accurate, there is still some sense of truth and honesty in this device. Before buying any Arduino board for this project, you have to take into account that you need to send the computer the data in order to effectively read it. So in that case, your Arduino board has to have a serial communication chip.

    You can take a look at To make this project a lot easier to accomplish, a good rule of thumb is to pick an Arduino board that already has a USB communication chip. This way, you would not have a hard time downloading more libraries and buying additional materials, cords, cables, etc. Rather than turning your keys in the doorknob, you can just unlock any door with a single swipe or tap of a card. Aside from the biometrics door lock that we have mentioned before, you can also make an RFID security system with your Arduino board.

    Since this project is really easy and cheap to make, several do-it-yourselfers already tried this successfully before. This project is well-documented by hobbyists so a quick Google search about the instructions would simply do the trick. So no more fumbling with your keys anymore! You can now just tap your card to unlock your front door. World Clock If you have friends, family, and colleagues abroad, then this project is a great addition to your home or office.

    Through this project, you can now check the time in other countries without opening your phone and accessing the internet.

    This wall-mounted timepiece is a perfect fixture for any house or office. On top of that, it is a cheap and easy project to make.

    You do not need any complex programming or coding skills in order to successfully make this project. More so, you can just download the library online and just load it into your Arduino board. Since this is a timepiece display, you need to buy a digital display screen as well. Hobbyists who successfully finish this project recommend using Arduino Uno as well as Arduino Nano for better display and power source.

    For a more seamless and clean-looking project, you can also buy a solderless breadboard with jumpers to make the project a lot easier.

    Social Distancing Sensor Physical distancing is now a necessary protective measure to prevent the spread of the virus. Made necessary by the ongoing pandemic, this project would surely come in handy if you are a business owner or you frequently go outside.

    This social distancing sensor would trigger an alarm if someone is sitting or standing too close to you. If you are running a business during this pandemic, then this device is a must-have in your store.

    Recent Posts

    This project is affordable and easy to make. Almost all the materials can be brought from any electronic store. Aside from your Arduino board, you just need a sensor, breadboard, jumpers, wires, and an LED. But if you want to, you can also add a sound alarm to make this device even more effective. In order to convert information provided by the coin-operated device into a specific timing we have created an interface board Fig.

    The interface board The coin-operated device used has two interfacing modes: serial and parallel; the first one, sends a set number of impulses on a dedicated output line according to the coin inserted, while in the parallel mode the one used in our project it takes advantage of a 6-pin interface, with each of the pins representing a group of coins.

    In this case, the pin corresponding to the recognized coin is earthed whenever a coin belonging to a group is inserted. The board we have combined with the coin-operated device you can see to two units connected in Fig.

    The keys, the dip-switch and the display constitute the user interface, while the coin device is the block labelled U4 in the circuit diagram. As with all the latest microcontrollers by Microchip, this can work between 1,8 and 3.

    In fact, once a certain timing has been launched the system will no longer consider signals provided by the coin-operated device, therefore the added cash would be ignored. As for lines RB6, RB7, RE3, dedicated to reading keys P1, P2 and P3, we have connected each one to an external pull-up resistor which ends on the positive side of the 3.

    13 Best Arduino Projects

    These lines of the microcontroller, since they cannot have an internal pull-up, are also equipped each one with an external resistor connected to 3,3V they are R15, R16, R17 and R For what concerns the bidirectional line, the functioning of this translator is like this: when SDA is at high level 5 V thanks to the pull-up resistor R2, the Q1 MOSFET is in interdiction and R1 resistor keeps pin 19 of the microcontroller at 3.

    The clock can work both following the 12 or hour format, with an indication for a. Besides that, the DS has a programmable clock output that provides a square wave obtained by the clock frequency of the clock which is in turn determined by the 32, kHz quartz connected to pins 1 and 2 which, through a dedicated internal divider, can be reduced to 1 Hz, kHz, kHz it can also provide the whole clock.

    The DS also has a control circuit which can check the lack or insufficiency of main power Vcc and make so that the voltage needed for its functioning is taken from the backup battery; in our case, it is a 3 V CR button battery BAT1guaranteeing an autonomy of around 6 months in case of no power and which is between pin 3 VBAT and ground pin 4, which is GND. So I will post the picture of the schematic made in Kicad good free software for schematics and PCB that I also use for other projects and a picture of my own setup.

    The jumper is there because programming the Arduino does not work whith the loopback needed by cctalk. Remove the jumper when programming the board. How the code works Device internal variables are defined, some are mandatory for all ccTalk devices like the device address others like sorter paths are specific to a coin acceptor, if you need a different device you will need to see which are specific to your device.

    Not that hard, you will find them while implementing the headers. You can find a list of the needed headers by device type in ccTalk documentation part 3 Appendix 1page 3. Just use hardware serial until I figure how to fix this.


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