diff --git a/AD9850.cpp b/AD9850.cpp
new file mode 100644
index 0000000..a858744
--- /dev/null
+++ b/AD9850.cpp
@@ -0,0 +1,93 @@
+/******************************************************************************************************************
+ * Arduino library for AD9850
+ * Created 23/08/2014
+ * Christophe Caiveau f4goj@free.fr 
+ *
+ * Use this library freely
+ *
+ * Hardware connections : 
+ * W_CLK   -> any pin
+ * FQ_UD   -> any pin
+ * DATA/D7 -> any pin
+ * RESET   -> any pin
+ *
+ * Functions :
+ * dds.begin(W_CLK pin, FQ_UD pin, DATA pin, RESET pin); Initialize the output pins and master reset the AD9850 
+ * dds.calibrate(frequency); Compensation of crystal oscillator frequency
+ * dds.setfreq(frequency,phase); frequency in Hz, phase coded on 5 bits
+ * dds.down(); power down mode reducing the dissipated power from 380mW to 30mW @5V
+ * dds.up(); wake-up the AD9850
+ *
+ * AD9850 datasheet at http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf
+ *
+ *****************************************************************************************************************/
+
+#include <AD9850.h>
+
+AD9850 DDS;
+
+AD9850::AD9850() {
+
+}
+
+void AD9850::begin(int w_clk, int fq_ud, int data, int reset) {
+	W_CLK = w_clk;
+	FQ_UD = fq_ud;
+	DATA = data;
+	RESET = reset;
+	deltaphase = 0;
+	phase = 0;
+	calibFreq = 125000000;
+	begin_priv();
+}
+
+void AD9850::begin_priv() {
+	pinMode(W_CLK, OUTPUT);
+	pinMode(FQ_UD, OUTPUT);
+	pinMode(DATA, OUTPUT);
+	pinMode(RESET, OUTPUT);
+	
+	pulse(RESET);
+	pulse(W_CLK);
+	pulse(FQ_UD);
+}
+
+void AD9850::update() {
+
+    for (int i=0; i<4; i++, deltaphase>>=8) {
+     shiftOut(DATA, W_CLK, LSBFIRST, deltaphase & 0xFF);
+    }
+    shiftOut(DATA, W_CLK, LSBFIRST, phase & 0xFF);
+    pulse(FQ_UD);
+}
+
+
+void AD9850::setfreq(double f, uint8_t p) {
+	deltaphase = f * 4294967296.0 / calibFreq;
+	phase = p << 3;
+	update();
+}
+
+
+void AD9850::down() {
+	pulse(FQ_UD);
+	shiftOut(DATA, W_CLK, LSBFIRST, 0x04);
+	pulse(FQ_UD);
+}
+    
+
+void AD9850SPI::up() {
+	update();
+}
+
+
+void AD9850::calibrate(double TrimFreq)
+{
+	calibFreq = TrimFreq;
+}
+
+
+void AD9850::pulse(int pin) {
+	digitalWrite(pin, HIGH);
+	digitalWrite(pin, LOW);
+}