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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 effort to resitute this first video game.
Pin 20 shows 0v
pin 21 shows 4.3v
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 it comes from pot. I bought this one : http://www.newark.com/bi-technologies-tt-electronics/p160knp-0qc20b10k/potentiometer-linear-10kohm-200mw/dp/34R4721?Ntt=1760793
I plug wires like this :
– brown (ADC) in center
– green (GND) at left
– orange (VCC) at right with 10k resistor
On button :
– blue (PC) with 10k resistor
– green GND
V+ is independent on each paddle or can I use one V+ for both ?
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 thing, ball goes in the wrong way.
I have good voltage on ADC lines from 0 to 5v when I turn the knob. Other thing, at the serve :
at the left side, ball goes on upper left.
at the right side, ball goes to bottom right.
Both paddles share the same vcc and gnd. It’s good ?