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--- en:tinkering_kit_light_level_meter_with_driver [2015/12/02 17:02]
brian.kim [Introduction]
+++ en:tinkering_kit_light_level_meter_with_driver [2017/04/01 08:29] (current)
odroid [Python example]
@@ Line 23: / Line 23: @@
 [[http://www.hardkernel.com/main/products/prdt_info.php?g_code=G141637532784|Where to buy]]
-====== Schematic ======
+====== DIY light level meter project ======
+==== Linux ====
+. Configuration tinkering kit such as below schematic.\\
+Light Level Meter schematic
 {{:en:tinkeringkitdriverleds.png?800|}}
+. Get the wiringPi library compatible **ODROID**
+<code>
+# git clone https://github.com/hardkernel/wiringPi
+</code>
+. Build the library
+<code>
+# cd wiringPi
+# ./build
+</code>
+. Compile and run the example source code.
+<file c example-led.c>
+//------------------------------------------------------------------------------------------------------------
+//
+// ODROID-C GPIO(LED) / ADC Test Application.
+//
+// Defined port number is wiringPi port number.
+//
+// Compile : gcc -o <create excute file name> <source file name> -lwiringPi -lwiringPiDev -lpthread
+// Run : sudo ./<created excute file name>
+//
+//------------------------------------------------------------------------------------------------------------
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <wiringPi.h>
+#include <wiringPiI2C.h>
+#include <wiringSerial.h>
+#include <lcd.h>
+//------------------------------------------------------------------------------------------------------------
+//
+// Global handle Define
+//
+//------------------------------------------------------------------------------------------------------------
+#define DATA_UPDATE_PERIOD  100 // 100ms
+//------------------------------------------------------------------------------------------------------------
+//
+// ADC:
+//
+//------------------------------------------------------------------------------------------------------------
+#define PORT_ADC   0   // ADC.AIN0
+#define MAX_ADC_VALUE	4095
+//------------------------------------------------------------------------------------------------------------
+//
+// LED:
+//
+//------------------------------------------------------------------------------------------------------------
+const int ledPorts[] = {
+,
+,
+,
+,
+,
+,
+,
+,
+,
+,
+};
+#define MAX_LED_CNT (sizeof(ledPorts) / sizeof(ledPorts[0]))
+#define ADC_UNIT	(MAX_ADC_VALUE / MAX_LED_CNT)
+//------------------------------------------------------------------------------------------------------------
+//------------------------------------------------------------------------------------------------------------
+//
+// system init
+//
+//------------------------------------------------------------------------------------------------------------
+int system_init(void)
+{
+    int i;
+    // GPIO Init(LED Port ALL Output)
+    for(i = 0; i < MAX_LED_CNT; i++)    pinMode (ledPorts[i], OUTPUT);
+    return  0;
+ }
+//------------------------------------------------------------------------------------------------------------
+//
+// board data update
+//
+//------------------------------------------------------------------------------------------------------------
+void boardDataUpdate(void)
+{
+    int i, adcValue, ledPos;
+    // adc value read
+    if((adcValue = analogRead (PORT_ADC)))    {
+	ledPos = adcValue / ADC_UNIT;
+    }
+    else
+        ledPos = 0;
+    //  LED Control
+    for(i = 0; i < MAX_LED_CNT; i++)    digitalWrite (ledPorts[i], 0); // LED All Clear
+    for(i = 0; i < ledPos;      i++)    digitalWrite (ledPorts[i], 1); // LED On
+}
+//------------------------------------------------------------------------------------------------------------
+//
+// Start Program
+//
+//------------------------------------------------------------------------------------------------------------
+int main (int argc, char *argv[])
+{
+    static int timer = 0 ;
+    wiringPiSetup ();
+    if (system_init() < 0)
+    {
+        fprintf (stderr, "%s: System Init failed\n", __func__);     return -1;
+    }
+    for(;;)    {
+        usleep(100000);
+        if (millis () < timer)  continue ;
+        timer = millis () + DATA_UPDATE_PERIOD;
+        // All Data update
+        boardDataUpdate();
+    }
+    return 0 ;
+}
+</file>
+====== Python example ======
+  * [[https://github.com/hardkernel/WiringPi2-Python|WiringPi2-Python repository for ODROID]]
+. Requrements install
+<code>
+# sudo apt update
+# sudo apt install python-dev python-setuptools swig3.0
+</code>
+. Get/setup WiringPi 2 for Python repository
+<code>
+# git clone https://github.com/hardkernel/WiringPi2-Python.git
+# cd WiringPi2-Python
+# git submodule init
+# git submodule update
+</code>
+. Build & install
+<code>
+# ./build.sh
+</code>
+Or
+<code>
+# swig3.0 -python -threads wiringpi.i
+# sudo python setup.py build install
+</code>
+**[[http://odroid.com/dokuwiki/doku.php?id=en:xu3_hardware_gpio#gpio_map_for_wiringpi_library_con10_2_x_15|WiringPi Pin Map]]**
+. Run the example source code
+<file python example-led.py>
+#!/usr/bin/python
+import wiringpi2 as wpi
+import time
+leds = [7, 0, 2, 3, 12, 13, 14, 21, 22, 23]
+wpi.wiringPiSetup()
+# GPOI pin setup
+for x in leds:
+	wpi.pinMode(x, 1)
+	wpi.digitalWrite(x, 0)
+adc_unit = 4095 / len(leds)
+while True:
+	time.sleep(0.05)
+	adcValue = wpi.analogRead(0)
+	ledPos = adcValue / adc_unit
+	for x in leds:
+		wpi.digitalWrite(x, 0)
+	for x in xrange(ledPos):
+		wpi.digitalWrite(leds[x], 1)
+</file>