diff --git a/Project/applications/smartcities/i2c.c b/Project/applications/smartcities/i2c.c
new file mode 100644
index 0000000..86521f9
--- /dev/null
+++ b/Project/applications/smartcities/i2c.c
@@ -0,0 +1,136 @@
+#include <stm32f10x.h>
+#include <stm32f10x_i2c.h>
+
+void I2C1_init()
+{
+	GPIO_InitTypeDef GPIO_InitStruct;
+	I2C_InitTypeDef I2C_InitStruct;
+
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
+	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
+
+	/*
+	 * 1. SCL on PB6 or PB8
+	 * 2. SDA on PB7 or PB9
+	 */
+
+	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_9;
+	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_A
+	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+	GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;	// set output to open drain
+	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;	// enable pull up resistors
+	GPIO_Init(GPIOB, &GPIO_InitStruct);		// init GPIOB
+
+	/* WARNING
+	 *
+	 * Check consistency with above configuration
+	 *
+	 * --Imanol
+	 */
+
+	// Connect I2C1 pins to AF
+	GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);	// SCL
+	GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1); // SDA
+
+	// configure I2C1
+	I2C_InitStruct.I2C_ClockSpeed = 100000;					// 100kHz - STANDARD MODE
+	I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
+	I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
+	I2C_InitStruct.I2C_OwnAddress1 = 0x00;
+	I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
+	I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+	I2C_Init(I2C1, &I2C_InitStruct);
+	I2C_Cmd(I2C1, ENABLE);
+}
+
+void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction)
+{
+	while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY))
+	{
+		// wait until I2C1 is not busy any more
+	}
+	I2C_GenerateSTART(I2Cx, ENABLE);
+
+	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
+	{
+		// wait for I2C1 EV5 --> Slave has acknowledged start condition
+	}
+	I2C_Send7bitAddress(I2Cx, address, direction);
+
+	if(direction == I2C_Direction_Transmitter)
+	{
+		while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
+		{
+			// wait for I2Cx EV6, check if Slave has acknowledged Master transmitter mode
+		}
+	}
+	else if(direction == I2C_Direction_Receiver)
+	{
+		while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
+		{
+			// wait for I2Cx EV6, check if Slave has acknowledged Master receiver mode
+		}
+	}
+}
+
+void I2C_write(I2C_TypeDef* I2Cx, uint8_t data)
+{
+	/* WARNING
+	 *
+	 * OJITO QUE ESTÁ ESPERANDO EL EV8 Y NO EL EV8_2
+	 *
+	 * --Imanol
+	 */
+	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTING))
+	{
+		// wait for I2C1 EV8 --> last byte is still being transmitted (last byte in SR, buffer empty), next byte can already be written
+	}
+	I2C_SendData(I2Cx, data);
+}
+
+uint8_t I2C_read_ack(I2C_TypeDef* I2Cx)
+{
+	I2C_AcknowledgeConfig(I2Cx, ENABLE);
+	while( !I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED))
+	{
+		// wait until one byte has been received
+	}
+	return I2C_ReceiveData(I2Cx);
+}
+
+uint8_t I2C_read_nack(I2C_TypeDef* I2Cx)
+{
+	I2C_AcknowledgeConfig(I2Cx, DISABLE);
+	I2C_GenerateSTOP(I2Cx, ENABLE);
+	while( !I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED))
+	{
+		// wait until one byte has been received
+	}
+	return I2C_ReceiveData(I2Cx);
+}
+
+void I2C_stop(I2C_TypeDef* I2Cx)
+{
+	I2C_GenerateSTOP(I2Cx, ENABLE);
+	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
+	{
+		// wait for I2C1 EV8_2 --> byte has been transmitted
+	}
+}
+
+/* SAMPLE CODE
+ *
+ * int main(void)
+ * {
+ * 	uint8_t received_data;
+ *	I2C1_init(); // initialize I2C peripheral
+ *	I2C_start(I2C1, SLAVE_ADDRESS<<1, I2C_Direction_Transmitter); // start a transmission in Master transmitter mode
+ *	I2C_write(I2C1, 0x01); // write one byte to the slave
+ *	I2C_stop(I2C1); // stop the transmission
+ *	I2C_start(I2C1, SLAVE_ADDRESS<<1, I2C_Direction_Receiver); // start a transmission in Master receiver mode
+ *	received_data = I2C_read_nack(I2C1); // read one byte and don't request another byte, stop transmission
+ *	while(1);
+ *	return 0;
+ * }
+ * --Imanol
+ */
diff --git a/Project/applications/smartcities/include/i2c.h b/Project/applications/smartcities/include/i2c.h
new file mode 100644
index 0000000..b214b7c
--- /dev/null
+++ b/Project/applications/smartcities/include/i2c.h
@@ -0,0 +1,12 @@
+#ifndef I2C_H
+#define I2C_H
+
+void I2C1_init();
+void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction);
+void I2C_stop(I2C_TypeDef* I2Cx);
+void I2C_write(I2C_TypeDef* I2Cx, uint8_t data);
+uint8_t I2C_read_ack(I2C_TypeDef* I2Cx);
+uint8_t I2C_read_nack(I2C_TypeDef* I2Cx);
+
+#endif
+