Display various signal or status properties in the form of a bar graph with JSB-R102510ZR and PIC18F57Q43
Let information shine bright - Illuminate data with precision and style
Published Feb 13, 2024
Click board™
BarGraph Click
Dev Board
Curiosity Nano with PIC18F57Q43
Compiler
NECTO Studio
MCU
PIC18F57Q43
Create displays that give you quick, easy-to-understand information about various things, like how loud the music is or how much power a device uses
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Hardware Overview
How does it work?
BarGraph Click is based on the JSB-R102510ZR, a bar graph LED array with ten red-colored LED segments from Ningbo, and two 74HC595, 8-bit serial-in, parallel-out shift registers with output latches from Texas Instruments to drive the JSB-R102510ZR. The 74HC595 ICs are comprised of a D-type internal storage register, as well as the serial-to-parallel shift register, both 8-bit wide. Each of these registers has its clock line, making it possible to clock in the desired data and then clock it out to the parallel output pins. The JSB-R102510ZR bar graph LED array has 10 red-colored LED segments. Each LED has its anode and cathode routed out, making each LED element absolutely independent so that it can be used in any circuit configuration. However, the JSB-R102510ZR bar graph display is connected as the display with the common cathode, meaning that all LED cathodes are connected to a single point. This LED cathode common line (CC) is connected to the drain of the N channel MOSFET, while its source is connected to the GND. Driving this MOSFET via its gate through the PWM pin of the mikroBUS™ allows dimming of the LED segments. Changing the PWM signal's duty cycle makes it possible to change the brightness of the XGURUGX10D bar graph display. The gate of this MOSFET is
connected to the PWM pin of the mikroBUS™ and it is pulled to VCC, allowing the display to work if the PWM pin is left floating. The Click board™ communicates with the host MCU via the mikroBUS™ SPI interface pins. Two bytes of information (16 bits in total) are pushed through the serial data input pin (DS) of the first 74HC595 IC, and routed to the SDI pin. The 74HC595 construction is such that after receiving 8 bits, clocking in one more bit will shift the existing 8 bits by one place, overflowing the last bit to the Q7S output pin and shifting it out that way. Since the Q7S of the first 74HC595 is connected to the DS pin of the second 74HC595, clocking 16 bits into the first 74HC595 IC will fill up both ICs with required data. Note that only two bits of the second byte will be used since the second shift register only has two outputs connected to the bar graph display (8 from the first IC + 2 from the second). It is worth mentioning that the Q7S of the last 74HC595 IC is routed to the MISO pin of the mikroBUS™, labeled as the SDO, allowing connection of multiple devices in cascade, building more complex setups. Adding more devices in the cascade would require more 8-bit words to be clocked into the first 74HC595 IC in the chain. When the data has been clocked in, the
SPI clock should be stopped, and the CS pin should be driven to a HIGH logic level. The CS pin of the mikroBUS™ is routed to the STCP pin of the 74HC595 ICs and labeled as LT on the Click board™. A rising edge on the STCP input pins of the 74HC595 ICs will latch the data from their internal storage registers to the output pins, polarizing the connected bar graph segment anodes. The onboard resistor pulls the STCP pin to a LOW logic level. If the previously mentioned MOSFET is in a conductive state, the current can flow through the LEDs, and the polarized LED elements will be lit. The #MR pin is used to clear the data in the internal storage register of the ICs. The LOW logic level on this pin will clear the content of this storage register, but it will not turn off the already activated outputs. The #MR pin is routed to the RST pin of the mikroBUS™, labeled as MR, and pulled to a HIGH logic level by the onboard resistor. 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
PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive
mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI
GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
128
Silicon Vendor
Microchip
Pin count
48
RAM (Bytes)
8196
You complete me!
Accessories
Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.
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 Nano with PIC18F57Q43 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 BarGraph Click driver.
Key functions:
bargraph_driver_init- Functions for initializes the chipbargraph_reset- Functions for reset the chipbargraph_display- Displays 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
* \brief BarGraph Click example
*
* # Description
* This application uses a high-quality bar graph LED display.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes driver init and BarGraph init.
*
* ## Application Task
* Counter passes through the loop and logs the value of the counter on the bargraph display.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "bargraph.h"
// ------------------------------------------------------------------ VARIABLES
static bargraph_t bargraph;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
bargraph_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.
bargraph_cfg_setup( &cfg );
BARGRAPH_MAP_MIKROBUS( cfg, MIKROBUS_1 );
bargraph_init( &bargraph, &cfg );
bargraph_reset( &bargraph );
}
void application_task ( void )
{
uint8_t cnt = 0;
for ( cnt = 0; cnt <= 10; cnt++ )
{
bargraph_display( &bargraph, cnt );
Delay_ms( 500 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
