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这个FM收音机内置Arduino, RDA5807M, Tiny RTC, PAM8403 D类放大器模块，TR028触摸面板。
背景
几年前，我买了一个淋浴房，里面安装了TR028无线电控制系统。不幸的是，有一天我发现这个系统完全失效了。在这之后我咨询了一段时间，发现找不到能修好他的人，所以之后我又买了一个更便宜的淋浴收音机。但大约一年后它又坏了。
这两次遭遇让我想起来我家以前在淋浴间里有一台收音机，所以我准备研究这些收音机是怎么制造出来的。在TR028系统中，我发现了一个奇怪的TEA5767模块。在经过一番搜索后，我了解到这是一个小的廉价调频无线电模块。同时在查找资料的过程中，我发现了另一个有趣的调频无线电模块RDA5807。它非常类似于TEA5767，但有RDS，音量控制和低音增强功能。所以我决定在我的新项目中使用RDA5807。
准备着手
我在网上搜索了一下，找到了几个使用RDA5807模块的项目，在参考完这些项目后，激发了我的一些想象力。
我的愿景:
在买到了RDA5807，带有32kb EEPROM的微型RTC, PAM8403, NOKIA 5110 LCD, LM2596模块后，我开始了实验。
最后得到了：
项目图片
对于诺基亚5110显示器，我找到了一个不错的库
了解TR028触摸屏的工作原理。实际上是2列X 7行键盘。为了操作它，我使用了这个库。
组装好的板放在盒子里。你可以注意到，我已经拆除了USB插座，并直接焊接了电缆。这是连接PC和未来软件改进的可能性。
如何工作
未来可能的改进
结论
我对我的新项目很满意。工作1个月后没有发现任何问题，除了时钟精度。
Project sketch：
/////////////////////////////////////////////////////////////////
// Arduino based shower FM Radio Project //
// Arduino NANO, RDA5807M, RTC, EEPROM, LCD5110, Thermistor //
/////////////////////////////////////////////////////////////////
#include <LCD5110_Graph.h> //http://www.rinkydinkelectronics.com/library.php?id=48
#include <AT24CX.h> //https://github.com/cyberp/AT24Cx
#include <Wire.h> //Arduino IDE included
#include <RDSParser.h> //http://www.mathertel.de/Arduino/RadioLibrary.aspx
#include <radio.h> //http://www.mathertel.de/Arduino/RadioLibrary.aspx
#include <RTClib.h> //https://github.com/adafruit/RTClib
#include <RDA5807M.h> //http://www.mathertel.de/Arduino/RadioLibrary.aspx
#include <Keypad.h> //http://playground.arduino.cc/Code/Keypad
#define MAXmenu 4
#define ledPin 13
#define blPin 7
//define the cymbols on the buttons of the keypads
char keys[7][2] = {
{'L', 'P'}, //LED, POWER
{'I', 'D'}, //INFO, DISPLAY
{'1', '2'}, //presets
{'3', '4'}, //from 1
{'5', '6'}, //to 6
{'M', 'm'}, //MODE, MEM
{'<', '>'} //down, up
};
byte rowPins[7] = {11, 12, 10, 17, 9, 16, 8}; //connect to the row pinouts of the keypad
byte colPins[2] = {15, 14}; //connect to the column pinouts of the keypad
//Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, 7, 2 );
boolean bass = 0, dspl = 0, memdisplay = 0, mempress = 0, adj = 0;
boolean ledPin_state, power_state;
int menu;
int volume, volumeOld = 5;
int frequency, frequencyOld;
int txtl = 0, temparray = 0;
int samples[5];
unsigned int status[6];
unsigned long timeprevious = 0, timeprev = 0;
// EEPROM object
AT24CX mem;
RTC_DS1307 rtc;
//(clk, din, dc, ce, rst)
LCD5110 lcd(6, 5, 4, 2, 3);
// Create an instance of a RDA5807 chip radio
RDA5807M radio;
/// get a RDS parser
RDSParser rds;
extern unsigned char SmallFont[];
extern uint8_t signal5[];
extern uint8_t signal4[];
extern uint8_t signal3[];
extern uint8_t signal2[];
extern uint8_t signal1[];
//--------------------------SETUP----------------------------------//
void setup()
{
analogReference(EXTERNAL);
Serial.begin(9600);
Wire.begin();
// Initialize the Radio
radio.init();
radio.debugEnable();
//initialize the Screen
lcd.InitLCD();
lcd.clrScr();
//lcd.setContrast(45); //adjust if default isn't good
lcd.setFont(SmallFont);
lcd.enableSleep(); //stand-by mode
power_state = 0; //don't "power-on" of the unit (stand by mode) when power supply is connected
//inicialize the keyboard
keypad.addStatedEventListener(keypadEvent); // Add an event listener for this keypad
keypad.setHoldTime(1500);
pinMode(ledPin, OUTPUT); // Sets the digital pin as output.
pinMode(blPin, OUTPUT); // Sets the digital pin as output.
digitalWrite(ledPin, LOW); // Turn the LED off.
digitalWrite(blPin, LOW); // Turn the BL off (stand-by mode)
ledPin_state = digitalRead(ledPin); // Store initial LED state. HIGH when LED is on.
//uncomment if rtc need to be adjusted
/*if (! rtc.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
//rtc.adjust(DateTime(2018, 3, 13, 22, 33, 0));
}*/
// read value of last frequency
frequency = mem.readInt(201);
volume = 2; //volume level at start
menu = 1; //shows VOLUMME mode at start
if (volume < 0) volume = 0;
if (volume > 15) volume = 15;
if (frequency < 0) frequency = 0;
if (frequency > 210) frequency = 210;
WriteReg(0x02, 0xC00d); // write 0xC00d into Reg.2 ( soft reset, enable,RDS, ) //bbz
canal(frequency);
// setup the information chain for RDS data.
radio.attachReceiveRDS(RDS_process);
rds.attachServicenNameCallback(DisplayServiceName);
//rds.attachTimeCallback(DisplayTime); //for future use. very inaccurate when RDS signal is weak.
rds.attachTextCallback(DisplayText);
}
//-----------------------end of Setup------------------------------------//
//--------------------------LOOP----------------------------------------//
void loop()
{
if ( frequency != frequencyOld)
{
frequencyOld = frequency;
mem.writeInt(201, frequency);
canal(frequency);
}
if (volume != volumeOld)
{
volumeOld = volume;
WriteReg(5, 0x84D0 | volume);
}
//read the keyboard
char key = keypad.getKey();
//check for RDS data
radio.checkRDS();
// reads temperature probe every 0,6 sec 5 times and calculates average
float average;
unsigned long timenow = millis();
if ((unsigned long)(timenow - timeprevious) > 600) {
timeprevious = timenow;
samples[temparray] = analogRead(A7);
temparray++;
}
if (temparray == 5) {
// calculating average of readings
average = 0;
for (int i = 0; i < 5; i++) {
average += samples[i];
}
printTemp(average);
temparray = 0;
}
// 4 sec timeout for MEM display and enter
unsigned long dabar = millis();
if (mempress == 1) {
timeprev = dabar;
memdisplay = 1;
mempress = 0;
}
if (memdisplay == 1) {
if ((unsigned long)(dabar - timeprev) < 4000) {
memdisplay = 1;
}
else {
memdisplay = 0;
}
}
/*Time adjustment instructions:
1. Run serial monitor
2. Set 9600 boud
3. Hit enter to activate serial reading
4. Write hXX, where XX is current hour reading on some time server and hit enter to adjust RTC hours. Serial monitor should write "Hours XX"
5. Write mXX, where XX is current minutes reading on some time server and hit enter to adjust RTC minutes. Serial monitor should write "Minutes XX"
6. Write sXX, where XX is current seconds reading on some time server and hit enter to adjust RTC seconds. Serial monitor should write "Seconds XX"
7. You can adjust only hours. I.e. when day light saving time was changed.
8. You can adjust only seconds if you need to correct time only.
9. If RTC has to be adjusted from zero (year, month, day, etc), uncomment RTC adjustment statement lines and upload the sketch.
*/
DateTime now = rtc.now();
if (Serial.available() > 0) {
char t = Serial.read();
switch (t) {
case ('h'): {
unsigned int hours = Serial.parseInt();
rtc.adjust(DateTime(now.year(), now.month(), now.day(), hours, now.minute(), now.second()));
Serial.println(F("Hours"));
Serial.println(hours);
break;
}
case ('m'): {
unsigned int mins = Serial.parseInt();
rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), mins, now.second()));
Serial.println(F("Minutes"));
Serial.println(mins);
break;
}
case ('s'): {
unsigned int sec = Serial.parseInt();
rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), now.minute(), sec));
Serial.println(F("Seconds"));
Serial.println(sec);
break;
}
}
}
//display various information on LCD
printSignalStrength();
printLines();
printTime();
printFreq();
printStereo();
printMode();
printMenu();
printDate();
lcd.update();
}
//------------------------End of Loop------------------------------------//
void printSignalStrength() //from 0000 to 1111 (0-63)
{
unsigned int sig;
Readstatus();
sig = status[1] / 1000;
if ((sig >= 0) && (sig <= 12)) {
lcd.drawBitmap(1, 1, signal1, 17 , 6);
}
if ((sig >= 13) && (sig <= 24)) {
lcd.drawBitmap(1, 1, signal2, 17 , 6);
}
if ((sig >= 25) && (sig <= 36)) {
lcd.drawBitmap(1, 1, signal3, 17 , 6);
}
if ((sig >= 37) && (sig <= 48)) {
lcd.drawBitmap(1, 1, signal4, 17 , 6);
}
if (sig >= 49) {
lcd.drawBitmap(1, 1, signal5, 17 , 6);
}
}
void printLines()
{
lcd.drawLine(0, 9, 84, 9);
lcd.drawLine(0, 39, 84, 39);
}
void printTemp(float average) //could be optimised :)
{
average /= 5;
average = 1023 / average - 1;
average = 51700 / average;
float steinhart;
steinhart = average / 50000; // (R/Ro)
steinhart = log(steinhart); // ln(R/Ro)
steinhart /= 3950; // 1/B * ln(R/Ro)
steinhart += 1.0 / (25 + 273.15); // + (1/To)
steinhart = 1.0 / steinhart; // invert
steinhart -= 273.15; // celsius conversion
int tmp = round(steinhart);
lcd.printNumI(tmp, 60, 1, 2);
lcd.print(F("~C"), 72, 1);
}
/// Update the ServiceName text on the LCD display when in RDS mode.
void DisplayServiceName(char *name)
{
lcd.print(name, 18, 22);
}
void DisplayText(char *text)
{
//scroll second RDS line
lcd.print(text, txtl, 30);
txtl = txtl - 66;
if (txtl == -396) txtl = 0;
}
void printTime()
{
DateTime now = rtc.now();
lcd.printNumI(now.hour(), 24, 1, 2, '0');
lcd.print(":", 36, 1);
lcd.printNumI(now.minute(), 42, 1, 2, '0');
}
void printDate()
{
if (dspl == 1) { //checks if display key was pressed
ClearRDS();
DateTime now = rtc.now();
lcd.printNumI(now.year(), 12, 22, 4);
lcd.print(".", 36, 22);
lcd.printNumI(now.month(), 42, 22, 2, '0');
lcd.print(".", 54, 22);
lcd.printNumI(now.day(), 60, 22, 2, '0');
int dw = now.dayOfTheWeek();
switch (dw) {
case 0:
lcd.print(F("Sekmadienis"), CENTER, 30); //sunday F() macro to save sdram
break;
case 1:
lcd.print(F("Pirmadienis"), CENTER, 30); //monday etc...
break;
case 2:
lcd.print(F("Antradienis"), CENTER, 30);
break;
case 3:
lcd.print(F("Treciadienis"), CENTER, 30);
break;
case 4:
lcd.print(F("Ketvirtadienis"), CENTER, 30);
break;
case 5:
lcd.print(F("Penktadienis"), CENTER, 30);
break;
case 6:
lcd.print(F("Sestadienis"), CENTER, 30);
break;
}
lcd.update();
delay(4000); //not optimal
ClearRDS();
dspl = 0;
}
}
void printMode()
{
lcd.print(F("MODE "), 0, 41);
}
void printMenu()
{
if (menu == 1) {
lcd.print(F("VOLUME "), 30, 41);
if (volume < 0) {
lcd.print(F("XX"), 72, 41);
}
else
lcd.printNumI(volume + 1, 72, 41, 2, '0');
}
if (menu == 2) {
lcd.print(F("AUTO-TUNE"), 30, 41);
}
if (menu == 3) {
lcd.print(F("MAN.-TUNE"), 30, 41);
}
if (menu == 4) {
lcd.print(F(" BASS "), 30, 41);
if (bass == 0) {
lcd.print(F("OFF"), 66, 41);
}
else
lcd.print(F(" ON"), 66, 41);
}
}
void printFreq() //displays current frequency
{
int frHundr, frDec;
unsigned int fr;
fr = 870 + frequency;
frHundr = fr / 10;
frDec = fr % 10;
lcd.printNumI(frHundr, 30, 12, 3);
lcd.print(F("."), 48, 12);
lcd.printNumI(frDec, 54, 12, 1);
lcd.print(F("MHz"), 66, 12);
}
void printStereo()
{
if (memdisplay == 1) { //if MEM key was pressed
lcd.print(F("MEM>"), 0, 12);
}
//Stereo detection
else if ((status[0] & 0x0400) == 0)
lcd.print(F("( )"), 0, 12); //means MONO
else
lcd.print (F("(ST)"), 0, 12); //means STEREO
}
void search(byte direc) //automatic seek
{
byte i; //seek up or down
if (!direc) WriteReg(0x02, 0xC30d);
else WriteReg(0x02, 0xC10d);
for (i = 0; i < 10; i++) {
delay(200);
Readstatus();
if (status[0] & 0x4000)
{
frequency = status[0] & 0x03ff;
break;
}
}
}
void canal( int canal) //direct frequency
{
byte numberH, numberL;
numberH = canal >> 2;
numberL = ((canal & 3) << 6 | 0x10);
Wire.beginTransmission(0x11);
Wire.write(0x03);
Wire.write(numberH); // write frequency into bits 15:6, set tune bit
Wire.write(numberL);
Wire.endTransmission();
}
//RDA5807_adrs=0x10;
// I2C-Address RDA Chip for sequential Access
int Readstatus()
{
Wire.requestFrom(0x10, 12);
for (int i = 0; i < 6; i++) {
status[i] = 256 * Wire.read () + Wire.read();
}
Wire.endTransmission();
}
//RDA5807_adrr=0x11;
// I2C-Address RDA Chip for random Access
void WriteReg(byte reg, unsigned int valor)
{
Wire.beginTransmission(0x11);
Wire.write(reg); Wire.write(valor >> 8); Wire.write(valor & 0xFF);
Wire.endTransmission();
//delay(50);
}
void RDS_process(uint16_t block1, uint16_t block2, uint16_t block3, uint16_t block4) {
rds.processData(block1, block2, block3, block4);
}
void ClearRDS()
{
lcd.print(" ", 0, 22);
lcd.print(" ", 0, 30);
}
// Taking care of some special events.
void keypadEvent(KeypadEvent key, KeyState kpadState ) {
switch (kpadState) {
/*
Another way to adjust time:
1. Press and hold key D for at least 2 sec, when you hear hour ending time signals, or see last hour seconds
on some accurate clock.
2. Release key D to adjust hh.00.00.
3. Ahter adjustment, if your clock was late from 15 to 1 minutes, minutes and seconds will be 00
and hours will be increased by 1.
4. If your clock was hurry from 1 to 15 minutes, only minutes and seconds will be 00.
*/
case HOLD:
if (key == 'D' && power_state == 1) {
adj = 1;
}
break;
case RELEASED:
if (key == 'D' && adj == 1) {
DateTime now = rtc.now();
if (now.minute() >= 45 && now.minute() <= 59) {
rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour() + 1, 0, 0));
}
if (now.minute() >= 1 && now.minute() <= 15) {
rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), 0, 0));
}
adj = 0;
}
break;
case PRESSED:
if (key == 'M' && power_state == 1) {
memdisplay = 0;
menu++;
if (menu > MAXmenu)menu = 1;
}
if (key == '>' && power_state == 1) {
memdisplay = 0;
switch (menu)
{
case 1:
if (volume < 0) {
if (bass == 0) {
WriteReg(0x02, 0xD00D);
volume = 0;
}
if (bass == 1) {
WriteReg(0x02, 0xC00D);
volume = 0;
}
}
else
volume++;
if (volume > 15)volume = 15;
break;
case 2:
search(0);
ClearRDS();
break;
case 3:
frequency++;
if (frequency > 210)frequency = 210; // upper frequency limit
ClearRDS();
break;
case 4:
if (bass == 0) {
bass = 1;
WriteReg(0x02, 0xD00D);
}
break;
}
}
if (key == '<' && power_state == 1) {
memdisplay = 0;
switch (menu)
{
case 1:
volume--;
if (volume < 0) {
WriteReg(0x02, 0x800D);
//volume = 0;
}
break;
case 2:
search(1);
ClearRDS();
break;
case 3:
frequency--;
if (frequency < 0)frequency = 0;
ClearRDS();
break;
case 4:
if (bass == 1) {
bass = 0;
WriteReg(0x02, 0xC00D);
}
break;
}
}
// LED lights on/off
if (key == 'L' && power_state == 1) {
digitalWrite(ledPin, !digitalRead(ledPin));
ledPin_state = digitalRead(ledPin); // Remember LED state, lit or unlit.
}
// turns "power" on or off (stand-by mode)
if (key == 'P')
{
digitalWrite(blPin, !digitalRead(blPin));
power_state = digitalRead(blPin);
if (power_state == 0) {
lcd.enableSleep();
digitalWrite(ledPin, LOW);
}
else lcd.disableSleep();
volume = 2;
menu = 1;
}
if (key == '1' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(110);
ClearRDS();
break;
case 1:
mem.writeInt(110, frequency);
memdisplay = 0;
break;
}
}
if (key == '2' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(120);
ClearRDS();
break;
case 1:
mem.writeInt(120, frequency);
memdisplay = 0;
break;
}
}
if (key == '3' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(130);
ClearRDS();
break;
case 1:
mem.writeInt(130, frequency);
memdisplay = 0;
break;
}
}
if (key == '4' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(140);
ClearRDS();
break;
case 1:
mem.writeInt(140, frequency);
memdisplay = 0;
break;
}
}
if (key == '5' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(150);
ClearRDS();
break;
case 1:
mem.writeInt(150, frequency);
memdisplay = 0;
break;
}
}
if (key == '6' && power_state == 1) {
switch (memdisplay) {
case 0:
frequency = mem.readInt(160);
ClearRDS();
break;
case 1:
mem.writeInt(160, frequency);
memdisplay = 0;
break;
}
}
if (key == 'm' && power_state == 1) {
mempress = 1;
}
else {
mempress = 0;
}
if (key == 'I' && power_state == 1) {
dspl = 1;
}
break;
}
}
如果您对此项目有任何想法、意见或问题，请在下方留言。
以上内容翻译自网络，原作者：Saulius Bandzevičius，如涉及侵权，可联系删除。
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