HN, can you help me find a game I played in the early 2000s? It was a browser game. You had a grid (pretty small), and components to put in like conveyor belts

HN, can you help me find a game I played in the early 2000s? It was a browser game. You had a grid (pretty small), and components to put in like conveyor belts. Each level had a winning condition, of course increasingly complex. The goal of the game was, as much as I can remember, teach you some basic programming concepts (like boolean gates). I faintly remember some red and yellow lights? I might be wrong. I remember getting addicted to this game, then lost track of it forever.