Achieve precise current monitoring in various industrial settings with HO 10-P and PIC32MZ2048EFM100
Current transducer with galvanic isolation and reliable measurements of DC, AC, and pulse currents up to 10ARMS
Published Mar 19, 2024
Click board™
Current Sens 2 Click
Development board
Curiosity PIC32 MZ EF
Compiler
NECTO Studio
MCU
PIC32MZ2048EFM100
Precise monitoring and control of both AC and DC currents, suitable for a wide range of applications where accurate current measurement and safety are crucial
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Hardware Overview
How does it work?
Current Sens 2 Click is based on the HO 10-P, an AC/DC current transducer from LEM USA. The HO 10-P is well-known for measuring DC, AC, and pulse currents up to 10ARMS with galvanic isolation between the primary and secondary circuits. With its core built on the open-loop Hall effect measuring principle, the Current Sens 2 Click ensures precise and reliable current measurements. Its capability covers a variety of industrial applications, including AC variable speed drives, UPS systems, SMPS, and power supplies for welding, which benefit from low power consumption and high immunity to external interference. The device's fast response time suits dynamic and demanding environments. The HO 10-P is designed for through-hole PCB mounting and features a sizable aperture (8x8mm) for the primary
conductor, ensuring easy integration and versatility. Although the sensor can measure current up to 10A, its sensitivity can be altered in three specific scenarios. When current is applied to the input, for instance, pin 6, and the output is obtained from pin 11, the sensor's sensitivity becomes x1. This configuration is considered as the wire being wound only once around the sensor's core, marking the first scenario. In another configuration, short-circuiting pins 7 and 10 while keeping the input and output on pins 6 and 11 doubles the sensitivity (x2). Similarly, sensitivity triples (x3) when pins 7-10 and 8-9 are short-circuited, maintaining the input and output on pins 6 and 11. Maintaining a straight signal path from the input to the output is crucial, as depicted in the schematic (6-11, 7-10, 8-9). It's also possible to measure the conductor's current by
pulling it through the sensor's core and allowing current to flow through it. The sensor is powered by the 5V mikroBUS™ power rail and outputs the sensed current as an analog signal through the AN pin. Additionally, an orange LED and a dedicated pin (OCD) on the mikroBUS™ socket signal an overcurrent condition, providing enhanced safety and monitoring features. 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
Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand
functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,
which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Curiosity PIC32 MZ EF as your development board.
Track your results in real time
Application Output
After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.
After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.
Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.
Software Support
Library Description
This library contains API for Current Sens 2 Click driver.
Key functions:
currentsens2_get_int_pin- Current Sens 2 get int pin state functioncurrentsens2_tare- Current Sens 2 tare functioncurrentsens2_get_current- Current Sens 2 read current 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 Current Sens 2 Click Example.
*
* # Description
* This example demonstrates the use of Current Sens 2 click board by reading and
* displaying the input current measurements.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and logger.
*
* ## Application Task
* Reads the input current measurements and displays the results on the USB UART
* approximately once per second.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "currentsens2.h"
static currentsens2_t currentsens2; /**< Current Sens 2 Click driver object. */
static log_t logger; /**< Logger object. */
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
currentsens2_cfg_t currentsens2_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.
currentsens2_cfg_setup( ¤tsens2_cfg );
CURRENTSENS2_MAP_MIKROBUS( currentsens2_cfg, MIKROBUS_1 );
if ( ADC_ERROR == currentsens2_init( ¤tsens2, ¤tsens2_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_printf( &logger, " Remove Click from the electrical circuit \r\n" );
Delay_ms( 1000 );
if ( CURRENTSENS2_ERROR == currentsens2_tare ( ¤tsens2 ) )
{
log_error( &logger, " Click tare error." );
for ( ; ; );
}
currentsens2_set_prim_turn_no( ¤tsens2, CURRENTSENS2_NUM_OF_PASSES_1 );
log_printf( &logger, " Connect Click to the electrical circuit \r\n" );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float current = 0;
if ( CURRENTSENS2_OK == currentsens2_get_current ( ¤tsens2, ¤t ) )
{
log_printf( &logger, " Current : %.2f[A]\r\n\n", current );
Delay_ms( 1000 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
