we are lloking for app developer in MIT appinvetor and thunkable to make an app to have front end display to show the excavator operator to indiacate where the front arm , how for away from the edge and how slope and how height . in simple way we are having angle sensor fitted in the arm of excavator and send you data on wifi. the data is length , depth and height of the bucket . reading has be displayed as well as the grapgically we have to show bucket is going up or down , how slope etc . user interface menu to opertor to fix the desirable height or depth , slope and length of working range of buacket . if anything exceeds we will have to raise alarm.