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Content """ Barometric altimeter Author: Nubesik """ import bme680, utime, display, buttons, ujson, uio from apps.barometric_altimeter import betterbutton as bb # docs: https://firmware.card10.badge.events.ccc.de/ BUTTONS = [] LAST_ACTION = 0 CONFIG = {} def init_buttons(): global BUTTONS, LAST_ACTION LAST_ACTION = utime.time() for b in (buttons.BOTTOM_LEFT, buttons.TOP_RIGHT, buttons.BOTTOM_RIGHT): BUTTONS.append(bb.Button(b)) def check_buttons(): global BUTTONS, CONFIG, LAST_ACTION for b in BUTTONS: b.checkButton() if BUTTONS[0].pressed(): # left LAST_ACTION = utime.time() CONFIG['cal'] = CONFIG['cal'] - 1 update_config() if BUTTONS[1].pressed(): # OK LAST_ACTION = utime.time() if BUTTONS[2].pressed(): # right LAST_ACTION = utime.time() CONFIG['cal'] = CONFIG['cal'] + 1 update_config() def update_config(): global CONFIG # only absolute path works. why? p = '/apps/barometric_altimeter/' try: f = open(p+'config.json', mode='w') except Exception as ex: print(ex) f.write(ujson.dumps(CONFIG)) f.close() def init_config(): global CONFIG # only absolute path works. why? p = '/apps/barometric_altimeter/' #p = '' try: f = open(p+'config.json', mode='r') except Exception as ex: print(ex) f = open(p+'config_default.json', mode='r') CONFIG = ujson.loads(f.read()) f.close() def main(): global CONFIG init_config() disp = display.open() disp.clear() init_buttons() while True: check_buttons() with bme680.Bme680() as environment: d = environment.get_data() pressure = d.pressure height = 288.15/0.0065*(1-(pressure/1013.25)**(1/5.255)) + CONFIG['cal'] disp.print("Altitude", fg=[255,255,255], bg=[0,0,0], posx=0, posy=0) disp.print("{:04.1f} m".format(height), fg=[255,255,255], bg=[0,0,0], posx=0, posy=40) disp.update() # console output print("Temp: {:4.0f} °C".format(d.temperature)) print("Humi: {:4.0f} %rh".format(d.humidity)) print("Pres: {:4.0f} hPa".format(d.pressure)) print("Alt: {:4.1f} m".format(height)) main()