Experience the future of parameter adjustments with PTA3043-2015CPB103 and STM32L073RZ
Slide to precision: Our mechanical slider potentiometer elevates control
Published Feb 26, 2024
Click board™
Slider 2 Click
Dev Board
Nucleo-64 with STM32L073RZ MCU
Compiler
NECTO Studio
MCU
STM32L073RZ
We aim to empower your projects with the precision and reliability of our slider potentiometer, offering seamless adjustments and control for a wide range of uses
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Hardware Overview
How does it work?
Slider 2 Click is based on the PTA3043, a linear, high-grade, 10K potentiometer from Bourns. This potentiometer has a 30 mm travel distance. The long travel distance of the wiper allows more accurate movements and combined with the high-quality manufacturing process it allows to dial-in the desired voltage with ease. This type of potentiometers are also known as sliders, thus the name for this Click board™. The potentiometer has a small dent in the middle, which enables tactile feedback when the center position is reached. The potentiometer is connected between the VREF and GND, acting as a voltage divider. Its wiper terminal outputs voltage in the range from 0 to 4.096V, depending on its position. The used potentiometer is linear, so the wiper potential changes linearly with its position. The voltage reference(VREF) is obtained from the MCP1501, a high-precision voltage reference IC from Microchip. The main purpose of this IC is to provide and retain a very accurate voltage of
4.096V. Its voltage reference is accurate enough for most applications where the analog output from the Slider 2 click can be utilized as a control voltage signal (CV). The output is buffered with a rail-to-rail, low-power operational amplifier, labeled as OPA344, produced by Texas Instruments. After the buffering op-amp, the output signal is delivered at the AN pin of the mikroBUS, labeled as VO on this Click Board, so it can be easily sampled by the internal A/D converter of the host microcontroller unit (MCU. Most MCUs have A/D peripherals that can use 4.096 as the reference voltage for the full-scale value (PIC 8-bit family is a good example). However, there are many cases where 2.048V is more adequate, so the Click board offers a choice: if there is a HIGH logic level at the RSL pin, the N-type MOSFET will open and another resistor will be introduced to the circuit. A voltage divider will be formed at the input of the buffering op-amp, which will halve the voltage from the potentiometer, reducing its maximum
value to 2.048V. When the logic level at the RSL pin is LOW, the N-type MOSFET will stay closed, so the second resistor of the voltage divider remains isolated. This will cause the full voltage level from the potentiometer to appear at the VO pin of the Click Board, in the range from 0 to 4.096V max. The MCP1501 IC has the #SHDN pin, used to shut down the IC when it's set to a LOW logic level. When this pin is set to a LOW logic level, the voltage reference output will be turned OFF, so there will be no voltage changes at the VO pin. By enabling the MCP1501 the voltage reference is established once again, so the Click Board can deliver an analog signal with the voltage ranging from 0 to 4.096V, or from 0 to 2.048V if the RSL pin is set to a HIGH logic level. It is recommended to start up the Click Board with the EN pin at the LOW logic level, to allow the internal power supply of the MCP1501 to reach its operational values.
Features overview
Development board
Nucleo-64 with STM32L073RZ MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
192
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
20480
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
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 Nucleo-64 with STM32L073RZ MCU as your development board.
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for Slider 2 Click driver.
Key functions:
slider2_enable- This function sets desired state to EN pinslider2_set_reference- This function sets desired reference to RSL pin
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
* \brief Slider2 Click example
*
* # Description
* This click utilizes potentiometer with long travel distance of the wiper
* witch allows more accurate movements and combined with the high-quality
* manufacturing process it allows to dial-in the desired voltage with ease.
* Its wiper terminal outputs voltage in the range from 0 to 4.096V.
* The used potentiometer is linear, so the wiper potential changes linearly with its position.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization driver init and ADC init.
*
* ## Application Task
* Read Slider data value and this data logs to USBUART every 500ms.
*
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "slider2.h"
// ------------------------------------------------------------------ VARIABLES
static slider2_t slider2;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
slider2_cfg_t cfg;
/**
* 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.
slider2_cfg_setup( &cfg );
SLIDER2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
slider2_init( &slider2, &cfg );
slider2_default_cfg( &slider2);
}
void application_task ( void )
{
slider2_data_t tmp;
// Task implementation.
tmp = slider2_generic_read ( &slider2 );
log_printf( &logger, "** ADC value : [DEC]- %d, [HEX]- 0x%x \r\n", tmp, tmp );
Delay_ms( 500 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
