# fusionlcd.py Test for asynchronous sensor fusion on Pyboard. Uses LCD display and uasyncio. # Author: Peter Hinch # Released under the MIT License (MIT) See LICENSE # Copyright (c) 2017-2020 Peter Hinch # Requires: # uasyncio V3 (Included in daily builds and release builds later than V1.12). # MPU9150 on X position # Normally open pushbutton connected between pin Y7 and ground # LCD driver alcd.py uasyncio V3 version from # https://github.com/peterhinch/micropython-async/blob/master/v3/as_drivers/hd44780/alcd.py # From https://github.com/micropython-IMU/micropython-mpu9x50: # imu.py, mpu9150.py, vector3d.py # From this repo: deltat.py fusion_async.py # Hitachi HD44780 2 row LCD display wired using 4 bit data bus as follows: # Name LCD connector Board # Rs 4 1 red Y1 # E 6 2 Y2 # D7 14 3 Y3 # D6 13 4 Y4 # D5 12 5 Y5 # D4 11 6 Y6 from machine import Pin import uasyncio as asyncio import gc from mpu9150 import MPU9150 from fusion_async import Fusion # Using async version from alcd import LCD, PINLIST # Library supporting Hitachi LCD module switch = Pin('Y7', Pin.IN, pull=Pin.PULL_UP) # Switch to ground on Y7 imu = MPU9150('X') # Attached to 'X' bus, 1 device, disable interruots lcd = LCD(PINLIST, cols = 24) # Should work with 16 column LCD # User coro returns data and determines update rate. # For 9DOF sensors returns three 3-tuples (x, y, z) for accel, gyro and mag # For 6DOF sensors two 3-tuples (x, y, z) for accel and gyro async def read_coro(): imu.mag_trigger() await asyncio.sleep_ms(20) # Plenty of time for mag to be ready return imu.accel.xyz, imu.gyro.xyz, imu.mag_nonblocking.xyz fuse = Fusion(read_coro) async def mem_manage(): # Necessary for long term stability while True: await asyncio.sleep_ms(100) gc.collect() gc.threshold(gc.mem_free() // 4 + gc.mem_alloc()) async def display(): lcd[0] = "{:5s}{:5s} {:5s}".format("Yaw","Pitch","Roll") while True: lcd[1] = "{:4.0f} {:4.0f} {:4.0f}".format(fuse.heading, fuse.pitch, fuse.roll) await asyncio.sleep_ms(500) async def lcd_task(): print('Running test...') if switch.value() == 1: lcd[0] = "Calibrate. Push switch" lcd[1] = "when done" await asyncio.sleep_ms(100) # Let LCD coro run await fuse.calibrate(lambda : not switch.value()) print(fuse.magbias) await fuse.start() # Start the update task loop = asyncio.get_event_loop() loop.create_task(display()) loop = asyncio.get_event_loop() loop.create_task(mem_manage()) loop.create_task(lcd_task()) loop.run_forever()