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Yes ! You'r right. Indeed pin 20 was not connected, I thought according the diagram that pins 20 et 21 had the same purpose and I connected only pin 21 to provide power to paddle. Now it works flawlessly.
Very thank for your help and your work and …
I feed with 5v provided by a PC PSU, but I can test with batery.
Ground connection is OK, my multimeter show 0 ohm everywhere on ground circuit
When no buttons are pressed the ball don't move, floats and falls automatically after 30s.
I wonder if…
Yes, I have mounted the 10k resistor and the push button is open type.
On the right player side, PC5 pin shows :
- 4.3v when button is open
- 0v when button is pushed
Thank for your help The range of the paddle don't change. The ball always goes to the opposite side. I notice when paddle is unpluged, scope displays the ball that changes side continuously, like if the players always pushed the button. But same thi…