![](/media/cache/profiles/Timo_01_DSC_4754_533x533.jpg.50x50_q85.jpg)
A concept design laboratory prototype for measuring ambient light value. The high levels typically mean that there is high rates of UVA and UVB radiation as well. A warning of this is displayed on a small screen. NXP FRDM-K64F, Digilent Pmod modules Pmod OLEDrgb and Pmod ALS. Tested as well on ST L432KC.
Dependencies: Adafruit_SSD1331_Mbed Adafruit-GFX
Diff: main.cpp
- Revision:
- 0:87339e72a5eb
- Child:
- 1:fde67a85d481
diff -r 000000000000 -r 87339e72a5eb main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Apr 19 16:06:25 2020 +0000 @@ -0,0 +1,147 @@ +/* mbed Microcontroller Library + * Copyright (c) 2019 ARM Limited + * SPDX-License-Identifier: Apache-2.0 + */ + +#include "mbed.h" +#include "Adafruit_SSD1331.h" +#include "Adafruit_GFX.h" + + +// PmodOLEDrgb +Adafruit_SSD1331 OLED(D8, D7, D10, D11, NC, D13); // cs, res, dc, mosi, (nc), sck + +DigitalOut LED(LED2); +DigitalOut VCCEN(D6); +DigitalOut PMODEN(D5); + +// Definition of colors on the OLED display +#define Black 0x0000 +#define Blue 0x001F +#define Red 0xF800 +#define Green 0x07E0 +#define Cyan 0x07FF +#define Magenta 0xF81F +#define Yellow 0xFFE0 +#define White 0xFFFF + +// PmodALS +SPI spi(D11, D12, D13); // mosi, miso, sck + + +DigitalOut alsCS(D4); // chip select for sensor SPI communication +char alsByte0 = 0; // 8 bit data from sensor board, char is the unsigned 8 bit +char alsByte1 = 0; // 8 bit data from sensor board +char alsByteSh0 = 0; +char alsByteSh1 = 0; +char als8bit = 0; +unsigned short alsRaw = 0; // unsigned 16 bit +float alsScaledF = 0; // 32 bit floating point +void getALS(); + + +char Time[50],Date[50]; +void getTime(); +int first(0); + +int main() +{ + // Showing with a LED that program has started + LED = 0; + VCCEN = 1; // if you did not connect VCCEN permanently to Vcc + PMODEN = 1; // if you did not connect PMODEN permanently to Vcc + wait_ms(2000); + LED = 1; + wait_ms(2000); + LED = 0; + // Initalize the PmodOLEDrgb + OLED.begin(); // initialization of display objcet + +// SPI for the ALS + alsCS = 1; + // Setup the spi for 8 bit data, high steady state clock, + // second edge capture, with a 12MHz clock rate + spi.format(8,0); + spi.frequency(12000000); + + while (true) { + while(first < 3) + { + first += 1; + OLED.fillScreen(Black); // background screen in black + OLED.setTextColor(Cyan); // color of text in cyan + OLED.setCursor(0,0); // cursor is in x=0 and y=15 + OLED.printf("Test module Pmod"); // display text + wait_ms(500); // wait 500 ms + OLED.setCursor(0,15); // cursor is in x=0 and y=15 + OLED.setTextSize(2); // size of text + OLED.setTextColor(Red); // text in red color + OLED.printf("DIGILENT"); // display text + OLED.setCursor(20,40); // cursor is in x=20 and y=40 + OLED.setTextSize(1); // size of text + OLED.setTextColor(Green); // text in green color + OLED.printf("LEXTRONIC"); // display text + OLED.drawFastHLine(1, 60, OLED.width()-1, Blue); // blue line x=1 to screen width-1 and y=60 + wait_ms(2000); // wait 2 s + OLED.fillScreen(Black); // background display in black (erase display) + OLED.fillRoundRect(5, 5, 30, 40, 1, Blue); // French flag bleu blanc rouge + OLED.fillRoundRect(35, 5, 30, 40, 1, White); + OLED.fillRoundRect(65, 5, 30, 40, 1, Red); + OLED.fillCircle(90, 55, 5, Yellow); // yellow circle with radius=5 in x=90 and y=55 + wait_ms(2000); // wait 2 s + } + + getTime(); + OLED.fillScreen(Black); // background screen in black + OLED.setTextColor(Cyan); // color of text in cyan + wait_ms(300); + OLED.setCursor(0,0); // cursor is in x=0 and y=0 + OLED.printf("Rec '%s' \r\n",Time); + + getALS(); + OLED.printf("LUX = '%0.1f' \r\n",alsScaledF); + + if (alsScaledF > 100) + { + OLED.setTextColor(Yellow); + OLED.printf("Be aware of high UV radiation!"); + OLED.fillRoundRect(10, 35, 50, 3 , 1, Yellow); + } + OLED.setCursor(0,40); // cursor is in x=0 and y=0 + OLED.printf("Test completed"); + printf("printed on OLED"); + + wait(1); +} +} + +void getTime() +{ + time_t seconds = time(NULL); + strftime(Time,40,"%H:%M:%S", localtime(&seconds)); + strftime(Date,40,"%d-%b-%Y", localtime(&seconds)); + printf("Recorded '%s' \r\n",Time); +} + +void getALS() +{ + alsCS = 0; + + alsByte0 = spi.write(0x00); + alsByte1 = spi.write(0x00); + + alsCS = 1; + + alsByteSh0 = alsByte0 << 4; + alsByteSh1 = alsByte1 >> 4; + + als8bit =( alsByteSh0 | alsByteSh1 ); + + alsRaw = als8bit; // + alsScaledF = (float(alsRaw))*(float(6.68)); // The value 6.68 is 64 bit double precision floating point of type double. + // Conversions to 32 bit floating point of type float. + printf("Ambient light raw 8 bit 0...255 = '%d' \r\n",alsRaw); + printf("Ambient light scaled to LUX = '%0.1f' \r\n",alsScaledF); + wait_ms(100); +} +