MIKROE-2269

BIG 7-SEG R click 1 BIG 7-SEG R click BIG 7-SEG R click BIG 7-SEG R click IC/Module Interface SC10-21SRWA datasheet [1] 74HC595 datasheet [2] SPI Power supply 3.3V or 5V Product page BIG 7-SEG R click [3] Schematic BIG 7-SEG R click schematic [4] BIG 7-SEG R click is what you need if you want to add a seven-segment LED display to your project. This click features an SC10-21SRWA 7-segment display. Communication between the MCU and the SC10-21SRWA display is established via serial-IN, parallel-OUT shift register 74HC595 IC. The click runs on either a 3.3V or 5V power supply and communicates with the target MCU over an SPI interface. Features and usage notes Display The click displays letters, numbers and symbols in highly readable form. It can be used in any simple interface and combined with other click boards. The color of the displayed character is red, as the R in the name of the click states. Seven segment displays use different combinations of the segments to display symbols, most commonly Arabic numerals. Each segment is connected to one of the pins on the 74HC595 IC. BIG 7-SEG R click 2 Light intensity The light intensity on the display is controlled via the PWM pin on the board. Application Adding a seven-segment LED display to your device with SPI interface. It can be used for digital clocks, vending machine displays, electronic meters and many other devices. Key features • SC10-21SRWA display • 1.0 inch digit height • Standard: gray face, white segment • Low current operation • Serial-IN, parallel-OUT shift register 74HC595 IC • Interface: SPI • 3.3V or 5V power supply Pinout diagram This table shows how the pinout on BIG 7-SEG R click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes mikroBUStm Not connected NC 1 AN Master Reset for 74HC595 MR 2 RST Latch for 74HC595 X PWM 16 PWM Display light intensity control INT 15 NC Not connected LAT 3 CS TX 14 NC Not connected Clock for 74HC595 CLK 4 SCK RX 13 NC Not connected Serial Data from 74HC595 to MCU DSO 5 MISO SCL 12 NC Not connected Serial Data from MCU to 74HC595 DSI 6 MOSI SDA 11 NC Not connected 7 +3.3V +5V 10 5V Data line when interfaced with 5V MCU and also power supply pin for display and the whole click hardware Data line when interfaced with 3.3V 3.3V MCU Ground GND 8 GND GND 9 GND Ground Jumpers and settings Information about onboard jumpers: Designator Name Default Position Default Option Description: describe the use + list all options with respective descriptions JP1 Left 3.3V Logic Level Selection toward host mcu 3.3V/5V, left position 3.3V, right position 5V Logic level BIG 7-SEG R click 3 Programming This demo is using BIG 7-SEG R click board to display characters in an endless loop, with fixed time interval whilst changing its PWM duty. • Operating Voltage Range: 2.0 to 6.0 V • Operating Temperature: – 55 to 125 C This example for STM32F107VC MCU ( EasyMx PRO v7 for ARM ), resets and initializes the BIG 7-SEG R click board takes characters from the static array and displays them while changing PWM duty cycle, all in an endless loop. extern char dig_array[MAX_CHARACTERS]; // Variables unsigned short counter; unsigned int luminosity; unsigned int pwm_period; int8_t valid; char demo_array[20] = { 'M', 'I', 'K', 'R', 'O', 'E', 'L', 'E', 'K', 'T', 'R', 'O', 'N', 'I', 'K', 'A', '2', '0', '1', '6' }; void main() { // MCU Init GPIO_Digital_Output(&GPIOD_ODR, _GPIO_PINMASK_13); PORTD.B13 as digital input GPIO_Digital_Output(&GPIOC_ODR, _GPIO_PINMASK_2); PORTC.B2 as digital output // Set // Set // SPI Init SPI3_Init_Advanced( _SPI_FPCLK_DIV16, _SPI_MASTER | _SPI_8_BIT | _SPI_CLK_IDLE_LOW | _SPI_FIRST_CLK_EDGE_TRANSITION | _SPI_MSB_FIRST | _SPI_SS_DISABLE | _SPI_SSM_ENABLE | _SPI_SSI_1, &_GPIO_MODULE_SPI3_PC10_11_12 ); // PWM Init pwm_period = PWM_TIM5_Init(5000); // PWM Init on 5kHz PWM_TIM5_Set_Duty(100, _PWM_NON_INVERTED, _PWM_CHANNEL1); PWM_TIM5_Start(_PWM_CHANNEL1, &_GPIO_MODULE_TIM5_CH1_PA0); // 74HC595 Init HC595_LAT = 0; HC595_RES = 0; HC595_reset(); BIG 7-SEG R click // Init counter and segment luminosity counter = 0; luminosity = 0; // Endless loop while (1) { valid = seg_7_display(demo_array[counter]); PWM_TIM5_Set_Duty(100 + luminosity, _PWM_NON_INVERTED, _PWM_CHANNEL1); delay_ms(750); luminosity += 100; counter++; if (counter == 20) counter = 0; if (luminosity == 4000) luminosity = 0; } } Resources • • • • • BIG 7-SEG R click schematic [4] SC10-21SRWA datasheet [1] 74HC595 datasheet [2] Libstock Library [5] mikroBUS™ standard specifications [6] References [1] [2] [3] [4] [5] [6] http:/ / www. kingbrightusa. com/ images/ catalog/ SPEC/ SC10-21SRWA. pdf http:/ / www. ti. com/ lit/ ds/ symlink/ sn74hc595. pdf https:/ / shop. mikroe. com/ click/ display/ big-7-seg-r http:/ / cdn-docs. mikroe. com/ images/ a/ a1/ BIG_7-SEG_R_click_schematic. pdf http:/ / libstock. mikroe. com/ projects/ view/ 1979/ big-7-seg-r-click http:/ / download. mikroe. com/ documents/ standards/ mikrobus/ mikrobus-standard-specification-v200. pdf 4 Article Sources and Contributors Article Sources and Contributors BIG 7-SEG R click  Source: http://docs.mikroe.com/index.php?oldid=3089  Contributors: Lana.vulic Image Sources, Licenses and Contributors File:Big-7-seg-r-click-front.jpg  Source: http://docs.mikroe.com/index.php?title=File:Big-7-seg-r-click-front.jpg  License: unknown  Contributors: Lana.vulic File:mikrobus logo.png  Source: http://docs.mikroe.com/index.php?title=File:Mikrobus_logo.png  License: unknown  Contributors: Vojislav.gvozdic License Creative Commons Attribution https:/ / creativecommons. org/ licenses/ by/ 4. 0/ 5