LOGIN
 · Navi MumbaiIndia
Share
Report
Get Link
IDEA

COIN SORTER AND COUNTER : EMBEDDED PROJECT

Aim is to build a coin sorter for Indian coins, sorting will be as per coin denomination and also counting/displaying the total amount of coins sorted.

Its an embedded project built using PIC micro controller.

Contributions
Ranjan Dailata

Great video and help to Sarika.

1 like 
Like
Award Contribution
Load 3 previous comments
Ravi Pujar
21
Community Expert
Embedded systems engineer, Founder @Valetron Systems, Blogger @www.raviyp.com
 · DharwadIndia
Share
Report
Get Link

You can use the Texas instruments Inductance sensor from the LDC series to detect the metal composition.

Like
2 likes 
Award Contribution
 · Navi MumbaiIndia
Share
Report
Get Link

Well i had a thought of working with load cell sensor of accuracy 0.1 gram so as to be able to differentiate the coins of different denomination as per their weights.
The load cell will give an output voltage for different weights/load which will be needed to be amplified and hence the sensor could be calibrated and interfaced with micro controller thus able to distinguish between the different denomination, this was the hole idea.
But the load cell (beam type) which i worked on resulted in an output voltage of 0.4 mV for 1,2 & 5 Rs. coins… so
this is where i am stuck .

Like
1 like 
Award Contribution
Ravi Pujar
21
Community Expert
Embedded systems engineer, Founder @Valetron Systems, Blogger @www.raviyp.com
 · DharwadIndia
Share
Report
Get Link

Looks like you will need a sensor with more accuracy and resolution, which is possible with calibration and a frontend circuit…
But the weight method is not recommended, as there is no way to detect duplicate coins of same weight. But for academic project, it should be ok.
To get his working, You need to get a load cell with driver (These will come with display for weight).
If you go to nearest weighing machine repair shop, they can calibrate and give it to you for getting smaller weights measured with good accuracy. And also check if you can get driver boards with RS232 interface, which you can easily interface with MCU.
I had done a Automatic groceries dispenser in this way, But i tapped the driver output lines to MCU ADC pin and measured from there.

Like
1 like 
Award Contribution
Claran Martis
33
Community Expert
Electronics and Communications Engineer
 · MangaluruIndia
Share
Report
Get Link

Hi,
According to me the weighing method may not be effective and would be much slower than manual sorting. The reason is that when the coin lands on the weighing device, the output of the device just gives an impulsive value and isn’t steady. This may somewhat work out when the difference in weight is large but for something like a coin I don’t think it works. The pressure on the sensor due to the impact of the coin may depend on varies factors like the number of times the coin bounces off the wall of the dispenser and its friction.
What I suggest is have a couple of sorting stages, first one just like the lego setup which sorts based on the size. And the next stage can sort different values of the same size. Simple image processing must be sufficient here. You would just have to compare the image with the template you store.
The reason I suggest two stages is to improve the sorting speed and reduce unnecessary image processing overhead. But however, when you convert this project into a product, you may also have to come up with ways to detect fake coins and count the amount of money.

Like
2 likes 
Award Contribution
Claran Martis
33
Community Expert
Electronics and Communications Engineer
 · MangaluruIndia
Share
Report
Get Link

Here are couple of sorting mechanisms


Like
2 likes 
Award Contribution
 · Navi MumbaiIndia
Share
Report
Get Link

Definetely there will be a magnetic sensor calibrated for fake coin detection .
Thanks for all the sugestions .
And I’ll think on the flaws of considering weight as a measure for sorting .

Like
3 likes 
Award Contribution
Leave a reply...
DISCOVER
CHAT
HIRE
ACTIVITY
FEED
New Post
Help
Start Project
Online Users
Share Link