Coin acceptor with relay project

[asuz]

Hello to all, I decided to make a coin acceptor relay board with nodemcu with your helps. I have a cheap chinese coin acceptor mechanism. There are Ground, coin and dc+12 pinout at hte coin mechanism. Which pins should I use at the nodemcu? Later I will connect an LCD to the nodemcu.

[TD-er]

What voltage is there at the "coin" pin?
Or is it a mechanical switch and if so, will it connect to GND or +12V?

[asuz]

What voltage is there at the "coin" pin?
Or is it a mechanical switch and if so, will it connect to GND or +12V?

Sorry I am not familiar with that mechanism but can you look at that page "https://miliohm.com/coin-acceptor-or-co ... h-arduino/" and help me. Somebody make it with arduino.

[TD-er]

OK, that's very simple indeed.



You simply add some pull-up resistor between 3V3 and the "coin" pin.
The "coin" pin should then be connected to a GPIO pin on the ESP.
Please consult these tables to pick the right GPIO pin: https://espeasy.readthedocs.io/en/lates ... on-esp8266

Then connect the ESP ground to the ground of the coin acceptor.

Just make sure both are powered via either the same power supply (and thus have a voltage regulator from 12V to what is needed for the ESP) or 2 separate power supplies which can share a common ground.
In other words, if you join both grounds, nothing should start to smoke


For the chosen GPIO pin, you must then add a pulse-counter task in ESPEasy.
I think you may also need to set some "debounce time", like 100 msec.
Set the trigger to "rising" in the pulse counter task.

[asuz]

OK, that's very simple indeed.



You simply add some pull-up resistor between 3V3 and the "coin" pin.
The "coin" pin should then be connected to a GPIO pin on the ESP.
Please consult these tables to pick the right GPIO pin: https://espeasy.readthedocs.io/en/lates ... on-esp8266

Then connect the ESP ground to the ground of the coin acceptor.

Just make sure both are powered via either the same power supply (and thus have a voltage regulator from 12V to what is needed for the ESP) or 2 separate power supplies which can share a common ground.
In other words, if you join both grounds, nothing should start to smoke


For the chosen GPIO pin, you must then add a pulse-counter task in ESPEasy.
I think you may also need to set some "debounce time", like 100 msec.
Set the trigger to "rising" in the pulse counter task.

Thank you very much.

[asuz]

I want to coin activated relay. Here is my project. LCD's first row type "please insert 3 coin" then if somebody insert 3 coin LCD's same (or second) row type "please push green button to start" then if green push button is pressed relay activated for 300 second by the way same (or third) row types "until finish ...... (countdown second)second remains. After 300 second later relay will off. At fourth row will type "push red button whenever to stop". Can you help me for coding it?

[TD-er]

Maybe others can help you first here as right now I'm working hard on other issues regarding ESP32 issues regarding the flash and sending data via HTTP (2 separate issues)

[asuz]

Maybe others can help you first here as right now I'm working hard on other issues regarding ESP32 issues regarding the flash and sending data via HTTP (2 separate issues)

Thank you, I hope somebody help me

[asuz]

It is been long to activate my coin acceptor with relay project. I have a big issue at the Pulse counter. As I attach the video, when I just touch the coin acceptor with coin, the pulse counter start to count without insert the coin. Please see the video and see what I mean. How can solve that issue?

[Ath]

Check your wiring, and GND to earth connection, as you seem to be injecting some external interference.

Have you tried increasing the Debounce-time to a larger number? 200 mSec seems more appropriate to me.

And adding a small capacitor across the pulse-counter input and GND, close to the ESP, might also help suppressing the interference.

[asuz]

Check your wiring, and GND to earth connection, as you seem to be injecting some external interference.

Have you tried increasing the Debounce-time to a larger number? 200 mSec seems more appropriate to me.

And adding a small capacitor across the pulse-counter input and GND, close to the ESP, might also help suppressing the interference.

incereasing debounce time not help to me, please sugget me the capacitor value to add ?

[Ath]

That capacitor couls be around 100 nF, I think.

[TD-er]

You can compute the rise/fall time of the signal for a capacitor + resistor.

For example: https://www.digikey.nl/en/resources/con ... e-constant

The RC time should roughly be 10 msec...
So 10 uF and 1k resistor... or 100 nF and 100k resistor should be fine.

[chromo23]

As I attach the video, when I just touch the coin acceptor with coin, the pulse counter start to count without insert the coin.

Does this also happen when only the coin module is connected and you measure the output with a multimeter for example?
If it produce the same results, than probably the coin module is broken / has issues...