This week, when taking a break from work, we received some enquiries for the coin sorter that we built some time back. While most people are happy playing with it and enjoy the speed, there is an inherent limitation (apart from the cost of building them one by one =)).
Coin sorters often use size to separate the coins, such as the one that we built previously. But in Singapore, the old $1 coins are of a similar size to the new 50 cent coins. That is probably why some NTUC trolleys accept both old $1 and new 50 cent coins.
Similarly, the old 50cent coins are of a similar size to the new $1 coins.
How might we separate 3rd generation coins from 2nd generation coins in Singapore?
Is it possible for us to separate coins of the 2 separate generations? It turns out that it is actually possible!