Note that the SET pin only needs to be connected for the APC220 setup program. The SET pin does not need to be connected for normal communications.
Here is my test code for the APC220 radios with Uno boards. Setup 2 Unos (or equivalent) with the APC220 radios as shown in the included schematic. Upload the same code to both Unos. You should see the value of millis() sent by one radio on the other Uno serial monitor. Open a new instance of the IDE for each Uno and set the serial monitor baud rate to 115200.
#include <SoftwareSerial.h>
SoftwareSerial apc(4,7);
void setup()
{
Serial.begin(115200);
apc.begin(9600);
}
void loop()
{
unsigned long now = millis();
static unsigned long timer = 0;
unsigned long interval = 1000;
if(now - timer >= interval)
{
timer = millis();
Serial.print("Sending ");
Serial.println(now);
apc.println(now);
}
if(apc.available() > 0)
{
Serial.print(char(apc.read()));
}
}
If this code will not work, the radios may not be set up the same or baud rates do not match each other or the serial rates in the code. The following is a sketch for setting up the radios. Make sure that they are set up the same (serial baud rate, air rate and frequency especially) and they match the baud rates in the code.
/*
1
apc220.println("WR 433900 3 9 3 0");
To configure the APC220 you need to set the SET pin HIGH and then pull it down (set it to LOW).
This will put the module in configuration mode. Once it is in configuration mode you can write
the configuration to it as displayed in the above example.
The format is
1
WR Frequency RFDataRate OutputPower UART-Rate Series check
Possible values for all these settings:
Frequency: Unit is KHz,for example 434MHz is 434000
RF Data Rate: 1,2,3 and 4 refer to 2400,4800,9600,19200bps
Output Power: 0 to 9, 9 means 13dBm(20mW)
UART Rate: 0,1,2,3,4,5 and 6 refers to 1200,2400,4800,9600,19200,38400,57600bps
Series Checkout: Series checkout:0 means no check,1 means even parity,2 means odd parity.
*/
#include <SoftwareSerial.h>
/*
1 SET connected to Arduino pin 13
2 AUX not connected
3 TXD connected to pin 4
4 RXD connected to pin 7
5 EN not connected
6 VCC connected to 5V
7 GND connected to ground
*/
const int pinRX = 4;
const int pinTX = 7;
const int pinSET = 13;
SoftwareSerial apc220(pinRX, pinTX); // Crt softserial port and bind tx / rx to appropriate PINS
void setupSoftAPC(void)
{
pinMode(pinSET, HIGH);
apc220.begin(9600);
}
void setSettings(void)
{
digitalWrite(pinSET, LOW); // pulling SET to low will put apc220 in config mode
delay(10); // stabilize please
// apc220.println("WR 433900 3 9 3 0");
apc220.println("WR 433900 3 9 3 0"); // change ss baud rate
delay(10);
while (apc220.available())
{
Serial.write(apc220.read());
}
digitalWrite(pinSET, HIGH); // put apc220 back in operation
delay(200);
}
void getSettings(void)
{
digitalWrite(pinSET, LOW); // pulling SET to low will put apc220 in config mode
delay(10); // stabilize please
apc220.println("RD"); // ask for data
delay(10);
Serial.println("reading ");
while (apc220.available())
{
Serial.write(apc220.read());
}
digitalWrite(pinSET, HIGH); // put apc220 back in operation
delay(200);
}
void setup()
{
Serial.begin(9600);
setupSoftAPC();
setSettings();
getSettings();
}
void loop()
{
static unsigned long radioTimer = 0;
unsigned long radioInterval = 5000;
if (millis() - radioTimer >= radioInterval)
{
radioTimer = millis();
apc220.println("Hello World!");
}
if (apc220.available())
{
Serial.println(char(apc220.read()));
}
}
