Mikas & Barkchip
Barkchip Barkchip
Hey Mikas, I’ve been building a little living‑tech garden where vines grow into the frames of a small autonomous planter. I need a smart control loop that can decide when to water, when to trim, and when to let the roots expand, so the whole thing stays balanced without my constant tinkering. Think you can help me code a bot that understands both plant biology and efficient pathfinding?
Mikas Mikas
Sure thing, here’s a quick sketch of what you’re looking for. Think of it as a loop that keeps an eye on two main data streams: the plant’s state (humidity, growth stage, root pressure) and the garden’s layout (paths, obstacles, watering stations). The bot will: 1. Poll the sensors 2. Run a simple decision tree (or tiny neural net if you’re into that) to decide whether to water, trim, or wait 3. Use A* (or Dijkstra) on a grid that represents the planter’s interior to pick the shortest route to the next watering point or trimming spot 4. Act via your actuators, then sleep for a bit Here’s a bare‑bones Python prototype to get you started: ``` import time import heapq class Plant: def __init__(self, id, pos): self.id = id self.pos = pos self.humidity = 0.0 self.growth = 0.0 self.root_pressure = 0.0 class GardenGrid: def __init__(self, width, height, obstacles): self.width = width self.height = height self.obstacles = set(obstacles) def neighbors(self, node): dirs = [(1,0),(-1,0),(0,1),(0,-1)] result = [] for dx,dy in dirs: nx, ny = node[0]+dx, node[1]+dy if 0 <= nx < self.width and 0 <= ny < self.height and (nx,ny) not in self.obstacles: result.append((nx,ny)) return result def heuristic(self, a, b): return abs(a[0]-b[0]) + abs(a[1]-b[1]) def astar(self, start, goal): frontier = [(0, start)] came_from = {start: None} cost_so_far = {start: 0} while frontier: _, current = heapq.heappop(frontier) if current == goal: break for next in self.neighbors(current): new_cost = cost_so_far[current] + 1 if next not in cost_so_far or new_cost < cost_so_far[next]: cost_so_far[next] = new_cost priority = new_cost + self.heuristic(next, goal) heapq.heappush(frontier, (priority, next)) came_from[next] = current path = [] node = goal while node != start: path.append(node) node = came_from[node] path.reverse() return path def decide_action(plant): if plant.humidity < 0.3: return "water" if plant.growth > 0.8 and plant.root_pressure > 0.7: return "trim" return "wait" def main_loop(): grid = GardenGrid(10,10,obstacles=[(3,3),(4,3)]) plants = [Plant(1,(2,2)), Plant(2,(7,7))] bot_pos = (0,0) while True: for plant in plants: # Update sensor readings here plant.humidity += 0.01 plant.growth += 0.02 plant.root_pressure += 0.01 action = decide_action(plant) if action == "water": path = grid.astar(bot_pos, plant.pos) # Move along path, trigger watering bot_pos = plant.pos print(f"Watered plant {plant.id}") elif action == "trim": path = grid.astar(bot_pos, plant.pos) bot_pos = plant.pos print(f"Trimmed plant {plant.id}") time.sleep(5) if __name__ == "__main__": main_loop() ``` Feel free to swap out the decision logic for something more sophisticated—maybe a tiny Bayesian model that takes light levels into account. The A* bit is just a skeleton; tweak the heuristic if your planter has diagonal movement or weighted costs. That should give you a decent starting point. Happy automating!
Barkchip Barkchip
Good start, Mikas. Just remember to fine‑tune the humidity thresholds to match the real sensor output, and maybe add a small delay between steps so the bot doesn’t jump straight to the plant. Also keep an eye on those diagonal moves; the current A* only handles orthogonal steps. Once that’s sorted, the loop should run smoother than a fresh leaf. Happy tinkering!
Mikas Mikas
Sounds good—add a short pause after each action so the bot doesn’t do a full sprint, and just flip the neighbor loop to include (1,1),(1,-1),(-1,1),(-1,-1) if you want diagonals. And don’t forget to calibrate those humidity numbers against the actual sensor range; a 0‑to‑1 scale is fine, but the thresholds have to line up. Once you’ve got that, the loop should flow smoother than a leaf in a breeze. Happy debugging!
Barkchip Barkchip
Nice tweak—diagonals will let the bot cut corners and feel less like a robot on a checkerboard. Just remember to adjust the path cost too; diagonal steps should cost about 1.4 instead of 1 if you’re keeping the heuristic simple. And for the humidity, log a few readings first, then pick a sweet spot—maybe start at 0.25 for watering, 0.75 for trim. That way the bot won’t jump at the slightest moisture drop. Once you lock that in, it’ll glide around the planter like a leaf drifting in a wind. Good luck!
Mikas Mikas
Sounds like a plan—just remember to tweak the cost when you add diagonals, otherwise the bot will think a straight line is cheaper than a diagonal. And good call on logging a few samples before you set the thresholds; a 0.25‑watering and 0.75‑trim range is a solid start. Once that’s all tuned, you’ll have a bot that drifts around the planter like a lazy leaf. Let me know how the logs look!
Barkchip Barkchip
Got it, will keep the cost tweak in the loop and log the raw humidity first. Once I see the spread, I’ll lock those 0.25 and 0.75 numbers in. I’ll ping you with a quick screenshot of the log once I’ve got a stable readout. Thanks for the heads‑up!
Mikas Mikas
Nice, hit me with that screenshot when you’ve got the numbers. I’ll be here to help tweak the thresholds if the spread looks off. Happy logging!
Barkchip Barkchip
Here’s a quick dump of the first 20 readings from the humidity sensor. The values run from about 0.12 up to 0.58, so a 0.25‑watering threshold still seems a bit low. I’m thinking of bumping it to 0.28, and the trim threshold to 0.72. I’ll keep the bot in “wait” mode until it hits those, then switch to water or trim. Let me know if that feels right or if we should shift the scale a little more.