el_supremo

Another possibility might be to use the time signal from radio stations - WWVB in North America, MSF in the UK, DCF77 in Europe, etc. Pete

twoBuf does not immediately follow oneBuf in memory. 1FFF8750-1FFF8744 = 0xC = decimal 12 (not 10) which means there is a two-byte gap between the end of oneBuf and the beginning of twoBuf. Those two bytes could be, for example, a 16-bit integer...

Pin 13 is the LED pin. It might be causing problems. Try using a different pin. Pete

Try this code. It's a modified version of the Blink example. Once a second it turns the built-in led and the four leds on pins 23, 24, 25, and 26 on and off. If they don't all flash on and off together, you have a wiring problem or dead output...

Your code works on my GPS+T4 when I change the baud rate to 9600 for my GPS. Are you sure that your GPS is set to 4800? Maybe try: SerialGPS.begin(9600); Pete

Try this code. #define GPS_SERIAL Serial1 // Very basic sketch to monitor GPS data from GPS_SERIAL void setup() { GPS_SERIAL.begin(9600); Serial.begin(9600); } void loop() { // while there's data from the GPS, send it to the computer...

and I had no problem when compiling a sleep example for T4.0 using Teensyduino 1.59b6 Pete