Simple Photon Ping Sensor (HC-SR04)

BDub · November 21, 2015, 3:55pm

@Hootie81 if you take the pulsein function and replicate it in your user app, if you do not divide the returned result by SYSTEM_US_TICKS (120 on the Photon and 72 on the Core), you’ll get the highest timing resolution available on both devices.

github.com

particle-iot/firmware/blob/af77c9d9aa1e80074867c43d438527456c750a55/hal/src/stm32f2xx/gpio_hal.c

/**
 ******************************************************************************
 * @file    gpio_hal.c
 * @authors Satish Nair, Brett Walach
 * @version V1.0.0
 * @date    10-Nov-2014
 * @brief
 ******************************************************************************
  Copyright (c) 2013-2015 Particle Industries, Inc.  All rights reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation, either
  version 3 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

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Also you can try using interrupts for greater accuracy:

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Simple Photon Ping Sensor (HC-SR04)

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