Mikroelektronika d.o.o.
SKU: MIKROE-4499ISM RX Click Board
ISM RX Click Board
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The ISM RX Click Board™ is a compact add-on board that contains a complete wireless RF digital data receiver. This board features the MAX1471, a low-power CMOS RF dual-channel receiver configurable through SPI serial interface from Maxim Integrated. It operates from 3V and 5V and is designed to receive amplitude-shift-keyed (ASK) and frequency-shift-keyed (FSK) data without reconfiguring the device or introducing any time delay generally associated with changing modulation schemes. Depending on signal power and component selection, this board supports a frequency of 433.92MHz. This Click Board™ is suitable for remote low-speed communication, such as remote keyless access, garage or gate doors control, industrial control, home automation, and similar applications.
The ISM RX 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 ISM RX Click Board™ Work?
The ISM RX Click Board™ as its foundation uses the MAX1471, a low-power CMOS superheterodyne receiver for both ASK and FSK data without reconfiguration from Analog Devices. It includes all the active components such as a low-noise amplifier, an image-reject mixer, a fully integrated PLL, 10.7MHz IF limiting amplifier received-signal strength indicator, low-noise FM demodulator, and a 3V voltage regulator. The MAX1471 can achieve data rates as high as 33kbps using Manchester Code (66kbps nonreturn to zero) depending on signal power and component selection.
As already mentioned before, this Click board™ can receive both ASK and FSK data simultaneously. This feature of the MAX1471 can be achieved and selected with the switch labelled as DMOD SEL that allows the selection between ASK and FSK data. The MAX1471 receives binary FSK or ASK data on a frequency of 433.92MHz, which is set based on the used components. ASK modulation uses a difference in the carrier's amplitude to represent logic 0 and logic 1 data, while the FSK uses the difference in frequency of the carrier.
Differential peak-detecting data demodulators are available for both the FSK and ASK analog baseband data recovery. The MAX1471 consists of a discontinuous Receive mode for low-power operation, configured through a serial interface. This mode also allows self-polling, where the MAX1471 can stay in Sleep mode as long as eight minutes and wake the system MCU, offering additional power savings. On the consumption side, it draws less than 1.1µA in Shutdown and only 7mA in Receive mode.
The ISM RX Click Board™ communicates with MCU using a standard SPI interface and possesses the SMA antenna connector with an impedance of 50Ω. This Click board™ can use it to connect the appropriate antenna that MikroE has in its offer, such as Rubber Antenna 433MHz Straight, for improved range and received signal strength.
The ISM RX Click Board™ operates only with a 5V logic voltage level from the mikroBUS™ socket. Still, the MAX1471 power supply offers the possibility of using both 3V, obtained by the NCP170 voltage regulator, and 5V logic voltage level selected via the HVIN SEL jumpers. Note that all the jumpers must be placed to the same side, or else the Click board™ may become unresponsive. 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 | Sub-1 GHz Transceievers |
| Applications | Can be used for remote low-speed communication, such as remote keyless access, garage or gate doors control, industrial control, home automation, and similar applications where this kind of communication is applicable |
| On-board modules | MAX1471 - low-power CMOS superheterodyne receiver for both ASK and FSK data without reconfiguration from Maxim Integrated |
| Key Features | Low power consumption, ASK and FSK demodulated data selection, programmable through serial user interface, low current consumption, and more. |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the ISM RX Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | NC | ||
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| 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-JP2 | HVIN SEL | Left | Logic Level Voltage Selection 3V/5V: Left position 3V, Right position 5V |
| SW1 | DMOD SEL | Left | FSK/ASK Data Output Selection |
ISM RX CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3 | - | 5 | V |
| ISM RX Frequency Range | - | 433.92 | - | MHz |
| RX Mode Current | - | 7 | - | mA |
| Sensitivity (ASK/FSK) | - | -114/-108 | - | dBm |
| Operating Temperature Range | -40 | +25 | +125 | °C |
Software Support
We provide a library for the ISM RX Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on mikroE Github account.
Library Description
This library contains API for the ISM RX Click Board™ driver.
Key Functions
ismrx_cfg_setup- Config Object Initialization function.ismrx_init- Initialization function.ismrx_default_cfg- Click Default Configuration function.
Example Description
This application shows capability of the ISM RX Click Board™. It sets default configuration, and collects and processes data from signal that received from ISM TX Click board. It can collect and process data from 2 type of the signal modulation( FSK and ASK ).
void application_task ( void )
{
if ( ismrx_get_data( &ismrx ) )
{
buffer[ buffer_cnt ] = '1';
}
else
{
buffer[ buffer_cnt ] = '0';
}
buffer_cnt++;
//Delay for sample ratio to be effective
Delay_us( 60 );
if ( buffer_cnt > BUFFER_SIZE )
{
proces_samples();
clear_buffers();
}
}
The full 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 the mikroE Github account.
Other mikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.ISMRX
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The ISM RX Click Board™ is supported with mikroSDK - MikroElektronika 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.
ISM RX Click Board
Frequently Asked Questions
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