30 min

Experience the future of control and calibration with our POT and PIC18LF27K40

Fine-tune, better performance: Redefining control with trimmers

POT 4 Click with EasyPIC v7

Published Nov 01, 2023

Click board™

POT 4 Click

Development board

EasyPIC v7


NECTO Studio



Our trimmer potentiometer solution is engineered to revolutionize control, providing fine-tuning capabilities for precise adjustments in a wide range of devices and applications



Hardware Overview

How does it work?

POT 4 Click is based on the PRS11R-425F-S103B1, a high-quality rotary 10k potentiometer from Bourns providing very accurate voltage output. The PDB081-P10-103B1 features a small form factor, offers a push-on momentary switch, a flatted shaft style, and a wide operating temperature range, withstanding 50V maximum voltage. Typical applications include consumer white goods, test and measurement equipment, communications and laboratory equipment, and other applications requiring an analog or digitized control voltage. The output of the potentiometer is brought to the non-inverting input of the OPA344, a rail-to-rail

operational amplifier from Texas Instruments, used as a stable unity gain buffer, providing a constant input and output impedance. Without a buffer, the variable impedance would affect the reference voltage. Therefore, the OPA344 ensures good stability of the circuit. A buffered signal can be converted to a digital value using the MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip using a 2-wire I2C compatible interface, or can be sent directly to an analog pin of the mikroBUS™ socket labeled as AN. The selection can be performed by using an onboard SMD switch labeled as VIN SEL, placing it

in an appropriate position marked as AN or ADC. Noting that the PRS11R-425F-S103B1 has an optional push momentary switch, this Click board™ also has an interrupt that will signal to users when this feature is used. 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.

POT 4 Click top side image
POT 4 Click bottom side image

Features overview

Development board

EasyPIC v7 is the seventh generation of PIC development boards specially designed to develop embedded applications rapidly. It supports a wide range of 8-bit PIC microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB-B. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyPIC v7 allows you to connect accessory boards, sensors, and custom electronics more efficiently than ever. Each part of

the EasyPIC v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use various 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-B (USB-B) connector. Communication options such as

USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from PIC10F, PIC12F, PIC16F, PIC16Enh, PIC18F, PIC18FJ, and PIC18FK families. EasyPIC v7 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.

EasyPIC v7 horizontal image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Analog Output
Power Supply
I2C Clock
I2C Data
Power Supply

Take a closer look


POT 4 Click Schematic schematic

Step by step

Project assembly

EasyPIC v7 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v7 as your development board.

EasyPIC v7 front image hardware assembly
Rotary B 2 Click front image hardware assembly
MCU DIP 28 hardware assembly
EasyPIC v7 MB 2 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
EasyPIC PRO v7a Display Selection Necto Step hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for POT 4 Click driver.

Key functions:

  • pot4_get_switch_pin - This function returns the switch (SW) pin logic state

  • pot4_read_voltage - This function reads raw ADC value and converts it to proportional voltage level

  • pot4_convert_voltage_to_percents - This function converts analog voltage to potentiometer position in percents

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 POT 4 Click Example.
 * # Description
 * This example demonstrates the use of POT 4 click board by reading and displaying
 * the potentiometer position.
 * The demo application is composed of two sections :
 * ## Application Init
 * Initializes the driver and logger.
 * ## Application Task
 * Reads and displays on the USB UART the potentiometer position in forms of voltage and
 * percents once per second only when the potentiometer switch is active.
 * @author Stefan Filipovic

#include "board.h"
#include "log.h"
#include "pot4.h"

static pot4_t pot4;     /**< POT 4 Click driver object. */
static log_t logger;    /**< Logger object. */

void application_init ( void )
    log_cfg_t log_cfg;  /**< Logger config object. */
    pot4_cfg_t pot4_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.
    pot4_cfg_setup( &pot4_cfg );
    POT4_MAP_MIKROBUS( pot4_cfg, MIKROBUS_1 );
    err_t init_flag = pot4_init( &pot4, &pot4_cfg );
    if ( ( ADC_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
        log_error( &logger, " Communication init." );
        for ( ; ; );
    log_info( &logger, " Application Task " );

void application_task ( void ) 
    if ( !pot4_get_switch_pin ( &pot4 ) )
        float voltage = 0;
        if ( POT4_OK == pot4_read_voltage ( &pot4, &voltage ) ) 
            log_printf( &logger, " AN Voltage : %.3f V\r\n", voltage );
            log_printf( &logger, " Potentiometer : %u %%\r\n\n", 
                        ( uint16_t ) pot4_convert_voltage_to_percents ( &pot4, voltage ) );
            Delay_ms( 1000 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support