Code:
/**************************************************************************
* This code is a modification/extract of several example-codes that come *
* with various si4703-libraries. Libraries used here are fetched from: *
* http://www.mathertel.de/Arduino/RadioLibrary.aspx *
* Not sure if other libraries work with same code. *
* 5 pushbuttons control the FM-radio (see comments in code) *
* OLED-display shows 3 lines: *
* 1- "frequency" *
* 2- "station name" or "scan mode" *
* 3- "volume level" + "battery voltage" or "CHARGE BATTERY" *
* Code for voltage monitoring is fetched from: *
* https://code.google.com/archive/p/tinkerit/wikis/SecretVoltmeter.wiki *
* *
* U.Galepp Jan./2018 *
**************************************************************************/
#include <Arduino.h>
#include <Wire.h>
#include <radio.h>
#include <si4703.h>
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); // define type of display (OLED 0.96" 128x64 pix)
#define FIX_BAND RADIO_BAND_FM // the band that will be tuned by this sketch is FM.
#define FIX_STATION 8760 // station at start-up is 87.60 MHz
#define FIX_VOLUME 7 // volume level at start-up
SI4703 radio; // Create an instance of Class for Si4703 Chip
int volume = FIX_VOLUME;
int button_1 = 3; // button volume up an Pin 3
int button_2 = 4; // button volume down an Pin 4
int button_3 = 5; // button station swap an Pin 5
int button_4 = 6; // button scan up an Pin 6
int button_5 = 7; // button scan down an Pin 7
int buttonState_1 = 0;
int buttonState_2 = 0;
int buttonState_3 = 0;
int buttonState_4 = 0;
int buttonState_5 = 0;
int flag = 0; // used for decission to show "Station Name" or "scan mode"
int stationNr = 0;
int fmFreq[10] = {8760, 8820, 9100, 9350, 9500, 10030, 10080, 10280, 10330, 10480};
char* fmName[10] = {" NDR 1 MV", " NDR Kultur", " NDR 1 MV", " NDR 2 MV",
" N-JOY", "Deutschlandfunk", " Antenne MV", " NDR Info",
"Radio Paradiso", " Ostseewelle"};
char vol[2];
float volts;
char akku[4];
long readVcc() {
long result;
// Read 1.1V reference against AVcc
ADMUX = _BV(REFS0) | _BV(MUX3)
| _BV(MUX2) | _BV(MUX1);
delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Convert
while (bit_is_set(ADCSRA,ADSC));
result = ADCL;
result |= ADCH<<8;
result = 1126400L / result; // Back-calculate AVcc in mV
return result;
}
/******************************
* Setup *
*****************************/
void setup() {
radio.init(); // initialize radio
radio.setBandFrequency(FIX_BAND, FIX_STATION);
radio.setMono(false);
radio.setMute(false);
pinMode(button_1, INPUT); // define button Pins
pinMode(button_2, INPUT); // -||-
pinMode(button_3, INPUT); // -||-
pinMode(button_4, INPUT); // -||-
pinMode(button_5, INPUT); // -||-
digitalWrite(button_1, HIGH); // button-Pin Pull-up
digitalWrite(button_2, HIGH); // -||-
digitalWrite(button_3, HIGH); // -||-
digitalWrite(button_4, HIGH); // -||-
digitalWrite(button_5, HIGH); // -||-
}
/******************************
* Subroutine Display on OLED *
*****************************/
void displayData()
{
volts = (float)readVcc()/(float)1000;
char s[12];
radio.formatFrequency(s, sizeof(s)); // format frequency value to output like: "87,60 MHz"
u8g.firstPage();
do {
u8g.drawFrame(0,0,128,64); // display frame around screen
u8g.setFont(u8g_font_timB14);
u8g.drawStr(15, 22, s);
u8g.setFont(u8g_font_unifont);
if(flag==0)
{
u8g.drawStr(4, 44, fmName[stationNr]); // if fequency from array, take name from array too
}
if(flag==1)
{
u8g.drawStr(25, 44, "scan mode"); // if frequency from scan, show "scan mode"
}
if(volts > 3.3) // if VCC > 3.3V display "Volume" & "Volt"
{
u8g.setFont(u8g_font_6x13);
u8g.drawStr(6, 59,"Volume: ");
sprintf (vol, "%d", volume); // change int "volume" to char "vol"
u8g.drawStr(50, 59, vol);
u8g.drawStr(68, 59,"Bat:");
dtostrf(volts, 2, 1, akku); // change float "volts" to char "akku"
u8g.drawStr(94, 59,akku);
u8g.drawStr(115, 59,"V");
}
else // if VCC >= 3.3V display "CHARGE BATTERY"
{
u8g.drawStr(6, 59,"CHARGE BATTERY");
}
}
while( u8g.nextPage() );
}
/******************************
* Main Loop *
*****************************/
void loop()
{
buttonState_1 = digitalRead(button_1);
buttonState_2 = digitalRead(button_2);
buttonState_3 = digitalRead(button_3);
buttonState_4 = digitalRead(button_4);
buttonState_5 = digitalRead(button_5);
if (buttonState_1 == LOW)
{
volume ++;
if (volume == 16) volume = 15;
radio.setVolume(volume);
delay(100);
}
if (buttonState_2 == LOW)
{
volume --;
if (volume < 0) volume = 0;
radio.setVolume(volume);
delay(100);
}
if (buttonState_3 == LOW)
{
stationNr ++;
if (stationNr == 10) stationNr = 0;
radio.setFrequency(fmFreq[stationNr]);
flag = 0;
delay(500);
}
if (buttonState_4 == LOW)
{
radio.seekUp();
flag = 1;
delay(200);
}
if (buttonState_5 == LOW)
{
radio.seekDown();
flag = 1;
delay(200);
}
displayData();
}
Falls Profis den Kopf schütteln, seid gnädig. Ich bin nur interessierter Laie, was das Programmieren angeht. Für Hinweise auf echte Fehler oder sinnvolle Verbesserungen bin ich aber sehr dankbar. Zumindest läuft der Code in der Form erst mal.
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