Mikroelektronika d.o.o.
SKU: MIKROE-5454POT 4 Click Board
POT 4 Click Board
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Key Features
- Resistance up to 10k, flatted metal shaft, low profile, push momentary switch, wide temperature and voltage range, wide mechanical angle, long rotational life, selectable analogue or digital output, and more
- Based on the PRS11R-425F-S103B1 - high-quality rotary 10k potentiometer from Bourns
- Can be used in audio and lighting applications, laboratory equipment, industrial automation controls, and other applications where a reliable potentiometer is required
- mikroBUS: I2C and Analogue Interfaces
The POT 4 Click Board™ is a compact add-on board with accurate selectable reference voltage output. This board features the PRS11R-425F-S103B1, a high-quality 11mm rotary 10k potentiometer from Bourns. The PRS11R-425F-S103B1 features a small form factor, a push-on momentary switch, a flatted shaft style, and a wide operating temperature range. It comes with a high-resolution 12-bit ADC, detecting even the slightest move while digitizing its position, alongside a rail-to-rail buffering operational amplifier, which provides constant input and output impedance. Besides, the user can process the output signal in analogue or digital form. This Click board™ can be used in audio and lighting applications, laboratory equipment, industrial automation controls, and other applications where a reliable potentiometer is required.
The POT 4 Click Board™ is supported by a mikroSDK-compliant library, which includes functions that simplify software development. This Click board™ comes as a thoroughly tested product, ready to be used on a system equipped with the mikroBUS™ socket.
How Does The POT 4 Click Board™ Work?
The POT 4 Click Board™ 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. Its typical applications include consumer white goods, test and measurement equipment, communications and laboratory equipment, and other applications requiring an analogue 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 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 analogue pin of the mikroBUS™ socket labelled as AN. The selection can be performed by using an onboard SMD switch labelled as VIN SEL, placing it in an appropriate position marked as AN or ADC. Bearing 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.
The POT 4 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the 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.
SPECIFICATIONS
| Type | Potentiometer |
| Applications | It can be used in audio and lighting applications, laboratory equipment, industrial automation controls, and other applications where a reliable potentiometer is required |
| On-board modules | PRS11R-425F-S103B1 - high-quality rotary 10k potentiometer from Bourns |
| Key Features | Resistance up to 10k, flatted metal shaft, low profile, push momentary switch, wide temperature and voltage range, wide mechanical angle, long rotational life, selectable analogue or digital output, and more |
| Interface | Analog, I2C |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the The POT 4 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Analog Signal | AN | 1 | AN | PWM | 16 | NC | |
| NC | 2 | RST | INT | 15 | SW | Switch Interrupt | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| SW1 | VIN SEL | Right | Output Signal A/D Selection AN/ADC: Left position AN, Right position ADC |
POT 4 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| ADC Resolution | - | 12 | - | bit |
| Potentiometer Resistance | - | - | 10 | kΩ |
Software Support
We provide a library for the POT 4 Click Board™ and a demo application (example), developed using MikroE compilers. The demo can run on all the main MikroE development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager(recommended), downloaded from our LibStock™ or found on the MikroE Github account.
Library Description
This library contains API for the POT 4 Click Board™ driver.
Key functions
-
pot4_get_switch_pinThis function returns the switch (SW) pin logic state. -
pot4_read_voltageThis function reads raw ADC value and converts it to the proportional voltage level. -
pot4_convert_voltage_to_percentsThis function converts analogue voltage to potentiometer position in percents.
Example Description
This example demonstrates using the POT 4 Click board™ by reading and displaying the potentiometer position.
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 Vrn", voltage );
log_printf( &logger, " Potentiometer : %u %%rnn",
( uint16_t ) pot4_convert_voltage_to_percents ( &pot4, voltage ) );
Delay_ms( 1000 );
}
}
}
The complete application code, and ready-to-use projects can be installed directly from NECTO Studio. The package Manager(recommended), downloaded from our LibStock™ or found on MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.POT4
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroE compilers.
MIKROSDK
This Click board™ is supported with mikroSDK - MikroE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
POT 4 Click Board
Frequently Asked Questions
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