Here is a diagram of one that someone else has built but I thought it might be done simpler. The diagram does not show the third actuator which controls the bucket curl. He used a second board for that one item.
I have built an electric front end loader on my garden tractor and it works fine but I am using two reversible momentary switches to control lift and curl of the bucket. In this fashion I have no ability to gradually move the bucket because they are either on or off and any nuance is not...