Scan Matrix

Using Arduino Project Guidance
1

i was trying to modify a toy keyboard to a midi keyboard just like from this website. Code Tinker Hack: How to turn Piano toy into MIDI keyboard (using Arduino/Atmega)

however, i encounter a problem when i was trying to figure out the scan matrix. i connect my multimeter as shown in my photo. it show that my second black key and second white is connected to this combination. based on my understanding, one key should be assign to one combination only

this toy keyboard is 37keys and has 10wires.
can someone tell me what is the problem here?
thanks in advance.

C360_2017-11-27-22-38-56-730.jpg
C360_2017-11-27-22-38-56-730.jpg2048×1536 299 KB

2

Maybe one key makes a connection between more than two wires? No idea how else 37 keys are mapped to 10 wires. Or there's something else going on in that keyboard.

3

Like diodes. Try using the Sherlock Holmes method - find all the other combinations first, the one that remains will be the solution. :slight_smile:

4

thanks for the reply, is it possible that this toy keyboard did not differentiate black and white?

5

zimbot97:
thanks for the reply, is it possible that this toy keyboard did not differentiate black and white?

Am I to understand you didn't follow my suggestion?

6

aarg:
Am I to understand you didn't follow my suggestion?

currently i don't have enough time, but i will try it when i got time, thanks for the suggestion