Monitor liquid flow with OPB350L250 and STM32F207VGT6
Crystal-clear view into the dynamics of fluid movement within your transparent tubes
Published Nov 14, 2023
Click board™
Water Detect 2 Click
Dev Board
EasyMx PRO v7a for STM32
Compiler
NECTO Studio
MCU
STM32F207VGT6
Our solution is designed to provide real-time, visual confirmation of liquid flow within clear tubes, ensuring precision and accuracy in fluid management.
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Hardware Overview
How does it work?
Water Detect 2 Click is based on the OPB350L250, a tube liquid sensor from TT Electronics. It consists of an LED and a phototransistor, where the phototransistor reads the light of an LED that passes through a clear tube. Depending on the liquid that passes through, you can distinguish light from dark liquid, no liquid presence, bubbles in the liquid that passes through the tube, or even no tube presence at all. You will have to identify the typical current values for each situation, where the ratio between the different states allows the acknowledgment of different conditions. In addition, the sensor itself comes in an opaque
plastic housing that enhances ambient light rejection. The housing „clicks“ around the tube, allowing a secure and tight connection. Water Detect 2 Click uses the MCP6022, a rail-to-rail input/output operational amplifier from Microchip, to amplify the output of the liquid sensor. For a visual presentation of the fluid sensor status, this Click board™ has an RGB LED that uses all three colors to indicate water detection, no water detection, and the LED ON. The onboard VREF potentiometer is used for the calibration of the liquid sensor. This way, you can set the threshold for what you want to detect. Water Detect
2 Click uses an interrupt DET pin (liquid detection) to communicate with the host MCU. In addition, you can turn the LED ON/OFF over the ON pin of the mikroBUS™ socket. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
Features overview
Development board
EasyMx PRO v7a for STM32 is the seventh generation of ARM development boards specially designed to develop embedded applications rapidly. It supports a wide range of 32-bit ARM microcontrollers from STMicroelectronics and a broad set of unique functions, such as the first-ever embedded debugger/programmer over USB-C. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. With two different connectors for each port, EasyMx PRO v7afor STM32 allows you to connect accessory boards, sensors, and custom electronics more efficiently than ever. Each part of the EasyMx
PRO v7a for STM32 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply block for the development board. It can use a wide range of external power sources, including an external 12V power supply, 7-23V AC or 9-32V DC via DC connector/screw terminals, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB-HOST/DEVICE, CAN, and
Ethernet are also included, including the well-established mikroBUS™ standard, one display option for the TFT board line of products, and a standard TQFP socket for the seventh-generation MCU cards. This socket covers 32-bit ARM MCUs like STM32 Cortex-M3, -M7, and -M4 MCUs. EasyMx PRO v7afor STM32 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Type
7th Generation
Architecture
ARM Cortex-M3
MCU Memory (KB)
10
Silicon Vendor
STMicroelectronics
Pin count
100
RAM (Bytes)
100
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the EasyMx PRO v7a for STM32 as your development board.
Track your results in real time
Application Output via UART Mode
1. Once the code example is loaded, pressing the "FLASH" button initiates the build process, and programs it on the created setup.
2. After the programming is completed, click on the Tools icon in the upper-right panel, and select the UART Terminal.
3. After opening the UART Terminal tab, first check the baud rate setting in the Options menu (default is 115200). If this parameter is correct, activate the terminal by clicking the "CONNECT" button.
4. Now terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.
Software Support
Library Description
This library contains API for Water Detect 2 Click driver.
Key functions:
waterdetect2_get_fluid_status- Water Detect 2 get fluid status function.waterdetect2_enable- Water Detect 2 enable function.waterdetect2_disable- Water Detect 2 disable function.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file main.c
* @brief Water Detect 2 Click Example.
*
* # Description
* This library contains API for Water Detect 2 Click driver.
* Water Detect 2 click is used for detecting water and other electroconductive liquids.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes driver and performs the default configuration.
*
* ## Application Task
* Reads fluid presence status and determines if there is fluid presence or not.
*
* @author Nenad Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "waterdetect2.h"
static waterdetect2_t waterdetect2; /**< Water Detect 2 Click driver object. */
static log_t logger; /**< Logger object. */
static uint8_t fluid_status_old = 2;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
waterdetect2_cfg_t waterdetect2_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
waterdetect2_cfg_setup( &waterdetect2_cfg );
WATERDETECT2_MAP_MIKROBUS( waterdetect2_cfg, MIKROBUS_1 );
if ( DIGITAL_OUT_UNSUPPORTED_PIN == waterdetect2_init( &waterdetect2, &waterdetect2_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
waterdetect2_default_cfg( &waterdetect2 );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
uint8_t fluid_status = waterdetect2_get_fluid_status( &waterdetect2 );
if ( fluid_status != fluid_status_old )
{
if ( WATERDETECT2_FLUID_DETECTED == fluid_status )
{
log_printf( &logger, " Fluid present! \r\n" );
}
else
{
log_printf( &logger, " No fluid present. \r\n" );
}
log_printf( &logger, "------------------- \r\n" );
fluid_status_old = fluid_status;
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
