electronic gearbox with 7i76E

it is not a real cnc problem but i think is also about  cnc  
for an agruculture  project ( corn sawing machien ) i need  to control 8 motor  who run at a controled speed  comparing the speed of the  traktor  
shaft enconder  on the wheel of the traktor  one pulse each cm  and  on the seed injektor  i have  60 pulse for each seed  
the problem is every 10 cm i like to shoot  1 seed   so for every 1 puls of the traktor the motor of the  seedinjektor had to turn 60 pulses 
i try  to solve this  problem with an aduino  with a dc powerd motor with an ibt2 pwm module 
it dont work  i lost to many  pulses and the rotation speed of de cd motor  wasn't stable  
i try it also with a isp32 and a PI 4b al with the same resultat 
do someone try these before  ? 

Hello,

Couldn't you get Arduino to output 60 or whatever you want when it gets a pulse? And send the whole thing to a stepper motor. In this case you don't need a directional signal.

Greetings Frank

@fons,
No double posting, and do not use the same title for multiple topics, just spent 10 minutes trying to save the one with replies.
Deleted the other.
Thank you.

@fons,
You just posted again the same question with the same subject, this is the second warning.
The other topic deleted, again.
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As for your question, it is to convoluted, try drawing a diagram, or take some pictures, or try explaining thing line by line as they are supposed to happen.

shaft enconder on the wheel of the traktor one pulse each cm and on the seed injektor i have 60 pulse for each seed
the problem is every 10 cm i like to shoot 1 seed so for every 1 puls of the traktor the motor of the seedinjektor had to turn 60 pulses

All we can understand from that is one seed must go after 60 pulses, that should be 10 cm but you say 1 pulse for 1cm, so that does not add up.