I have a 4026 counter chip controlling a seven segment LED display.
The current set up is every time I press a button it advances by one digit on the display. See circuit below.
This circuit runs on 9v so I haven't been too adventurous in my testing from fear of frying the Raspberry Pi.
How can I control this with an Raspberry Pi, regarding 9v vs Raspberry Pis 3,3 volt ?