diff --git a/CubeSatSim.ino b/CubeSatSim.ino
new file mode 100644
index 00000000..cc3c84e3
--- /dev/null
+++ b/CubeSatSim.ino
@@ -0,0 +1,125 @@
+/*
+ *  Transmits CubeSat Telemetry at 434.9MHz in AFSK, FSK, or CW format
+ *
+ *  Copyright Alan B. Johnston
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// This code is an Arduino sketch for the Raspberry Pi Pico
+// based on the Raspberry Pi Code
+
+#include "main.h"
+
+void setup() {
+
+  Serial.begin(9600);
+  
+  Serial.println("Pico v0.1 starting...\n\n");
+
+
+// set all Pico GPIO pins to input
+  
+// detect Pi Zero using 3.3V
+  
+// if Pi is present, run Payload OK software
+  
+// otherwise, run CubeSatSim Pico code
+  
+  Serial.println("\n\nCubeSatSim Pico v0.1 starting...\n\n");
+  
+  mode = FSK;
+  frameCnt = 1;
+  
+  Serial.println("v1 Present with UHF BPF\n");
+  txLed = 2;
+  txLedOn = HIGH;
+  txLedOff = LOW;
+  vB5 = TRUE;
+  onLed = 27;
+  onLedOn = HIGH;
+  onLedOff = LOW;
+  transmit = TRUE;  
+  
+  if (mode == FSK) {
+    bitRate = 200;
+    rsFrames = 1;
+    payloads = 1;
+    rsFrameLen = 64;
+    headerLen = 6;
+    dataLen = 58;
+    syncBits = 10;
+    syncWord = 0b0011111010;
+    parityLen = 32;
+    amplitude = 32767 / 3;
+    samples = S_RATE / bitRate;
+    bufLen = (frameCnt * (syncBits + 10 * (headerLen + rsFrames * (rsFrameLen + parityLen))) * samples);
+
+    samplePeriod =  (int) (((float)((syncBits + 10 * (headerLen + rsFrames * (rsFrameLen + parityLen)))) / (float) bitRate) * 1000 - 500);
+    sleepTime = 0.1f;
+
+    frameTime = ((float)((float)bufLen / (samples * frameCnt * bitRate))) * 1000; // frame time in ms
+
+//    printf("\n FSK Mode, %d bits per frame, %d bits per second, %d ms per frame, %d ms sample period\n",
+//      bufLen / (samples * frameCnt), bitRate, frameTime, samplePeriod);
+  } else if (mode == BPSK) {
+    bitRate = 1200;
+    rsFrames = 3;
+    payloads = 6;
+    rsFrameLen = 159;
+    headerLen = 8;
+    dataLen = 78;
+    syncBits = 31;
+    syncWord = 0b1000111110011010010000101011101;
+    parityLen = 32;
+    amplitude = 32767;
+    samples = S_RATE / bitRate;
+    bufLen = (frameCnt * (syncBits + 10 * (headerLen + rsFrames * (rsFrameLen + parityLen))) * samples);
+
+    samplePeriod = ((float)((syncBits + 10 * (headerLen + rsFrames * (rsFrameLen + parityLen))))/(float)bitRate) * 1000 - 1800;
+    //    samplePeriod = 3000;
+    //    sleepTime = 3.0;
+    //samplePeriod = 2200; // reduce dut to python and sensor querying delays
+    sleepTime = 2.2f;
+
+    frameTime = ((float)((float)bufLen / (samples * frameCnt * bitRate))) * 1000; // frame time in ms
+
+//    printf("\n BPSK Mode, bufLen: %d,  %d bits per frame, %d bits per second, %d ms per frame %d ms sample period\n",
+//      bufLen, bufLen / (samples * frameCnt), bitRate, frameTime, samplePeriod);
+
+    sin_samples = S_RATE/freq_Hz;	 		
+  //      printf("Sin map: ");	 		
+    for (int j = 0; j < sin_samples; j++) {	 		
+      sin_map[j] = (short int)(amplitude * sin((float)(2 * M_PI * j / sin_samples)));	 		
+  //	printf(" %d", sin_map[j]);	 		
+//   }	 		
+      printf("\n");
+   }
+  
+// program Transceiver board  
+  
+}
+
+void loop() {
+  
+  // query INA219 sensors and Payload sensors
+  
+  // encode as digits (APRS or CW mode) or binary (DUV FSK)
+  
+  // send telemetry
+  
+  // delay some time
+  
+}
+
+