diff --git a/Sharpi/Pot.cs b/Sharpi/Pot.cs
new file mode 100644
index 0000000..87cf706
--- /dev/null
+++ b/Sharpi/Pot.cs
@@ -0,0 +1,140 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Sharpi
+{
+    public partial class Pot
+    {
+        // pot (common interface)
+
+        [DllImport("sharpi")]
+        [return: MarshalAs(UnmanagedType.LPStr)]
+        internal static extern string pot_get_description(IntPtr sensor);
+
+        [DllImport("sharpi")]
+        internal static extern void pot_delete(IntPtr sensor);
+
+
+        // pot (special functions for each type)
+
+
+        // AMG8833
+        [DllImport("sharpi")]
+        internal static extern IntPtr pot_ds3502_new(byte i2cAddress);
+
+        [DllImport("sharpi")]
+        internal static extern IntPtr pot_ds3502_new_x(byte i2cAddress, [MarshalAs(UnmanagedType.LPStr)] string i2cDevice);
+
+
+        [DllImport("sharpi")]
+        internal static extern void pot_ds3502_power_on(IntPtr sensor);
+
+        [DllImport("sharpi")]
+        internal static extern void pot_ds3502_power_off(IntPtr sensor);
+
+        [DllImport("sharpi")]
+        internal static extern byte pot_ds3502_get_wiper(IntPtr pot);
+
+        [DllImport("sharpi")]
+        internal static extern void pot_ds3502_set_wiper(IntPtr pot, byte value);
+
+        [DllImport("sharpi")]
+        internal static extern void pot_ds3502_set_wiper_persistent(IntPtr pot, byte value);
+    }
+
+    // sensor
+
+    public abstract class PotBase : IDisposable
+    {
+        protected IntPtr _handle = IntPtr.Zero;
+
+        public PotBase(IntPtr handle)
+        {
+            _handle = handle;
+        }
+
+        public void Dispose()
+        {
+            if (_handle != IntPtr.Zero)
+            {
+                Pot.pot_delete(_handle);
+                _handle = IntPtr.Zero;
+            }
+        }
+
+        public string Description
+        {
+            get
+            {
+                if (_handle != IntPtr.Zero)
+                {
+                    return Pot.pot_get_description(_handle);
+                }
+                else
+                {
+                    return "";
+                }
+            }
+        }
+    }
+
+
+    public static partial class Pot
+    {
+        public class Ds3502 : PotBase
+        {
+            /// <summary>
+            /// Ds3502 digipot, standard i2caddress 0x28
+            /// </summary>
+            public Ds3502(byte i2caddress)
+                : base(pot_ds3502_new(i2caddress))
+            {
+            }
+
+            public Ds3502(byte i2caddress, string i2cdevice)
+                : base(pot_ds3502_new_x(i2caddress, i2cdevice))
+            {
+            }
+
+            public void PowerOn()
+            {
+                pot_ds3502_power_on(_handle);
+            }
+
+            public void PowerOff()
+            {
+                pot_ds3502_power_off(_handle);
+            }
+
+            public byte GetWiper()
+            {
+                return pot_ds3502_get_wiper(_handle);
+            }
+
+            /// <summary>
+            /// sets the wiper value
+            /// </summary>
+            /// <param name="value">0..127</param>
+            public void SetWiper(byte value)
+            {
+                pot_ds3502_set_wiper(_handle, value);
+            }
+
+            /// <summary>
+            /// sets the wiper value and stores it in the EEPROM (~50000 writes)
+            /// </summary>
+            /// <param name="value">0..127</param>
+            public void SetWiperPersistent(byte value)
+            {
+                pot_ds3502_set_wiper_persistent(_handle, value);
+            }
+        }
+
+    }
+
+
+}
diff --git a/Sharpi/Sharpi.csproj b/Sharpi/Sharpi.csproj
index ff0bc99..83851a4 100644
--- a/Sharpi/Sharpi.csproj
+++ b/Sharpi/Sharpi.csproj
@@ -14,7 +14,7 @@
 		<PackageIcon>img\sharpi.png</PackageIcon>		
 		<AssemblyVersion>1.0.3.1</AssemblyVersion>
 		<FileVersion>1.0.3.1</FileVersion>
-		<Version>1.0.3.4</Version>
+		<Version>1.0.3.5</Version>
 		<PackageReadmeFile></PackageReadmeFile>
 		<PackageTags>Raspberry;Pi;iot;</PackageTags>
 		<PackageProjectUrl>https://github.com/A-J-Bauer/sharpi</PackageProjectUrl>
diff --git a/Sharpi/cpp/sharpi/CMakeLists.txt b/Sharpi/cpp/sharpi/CMakeLists.txt
index 5419288..1638084 100644
--- a/Sharpi/cpp/sharpi/CMakeLists.txt
+++ b/Sharpi/cpp/sharpi/CMakeLists.txt
@@ -37,6 +37,9 @@ add_library(sharpi SHARED
     SensorAmg8833.cpp
     SensorIr28khz.h
     SensorIr28khz.cpp
+    Pot.h
+    PotDs3502.h
+    PotDs3502.cpp
 )
 
 target_include_directories(sharpi
diff --git a/Sharpi/cpp/sharpi/Pot.h b/Sharpi/cpp/sharpi/Pot.h
new file mode 100644
index 0000000..6476f81
--- /dev/null
+++ b/Sharpi/cpp/sharpi/Pot.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+
+/// <summary>
+/// The base class for pots, all pots participating in the C-Api have to derive from this
+/// </summary>
+class Pot
+{
+
+public:
+    Pot() {};
+    virtual ~Pot() {};
+    virtual std::string GetDescription() = 0;
+    virtual const char* GetDescriptionC() = 0;
+    virtual void PowerOn() = 0;
+    virtual void PowerOff() = 0;
+};
+
+
diff --git a/Sharpi/cpp/sharpi/PotDs3502.cpp b/Sharpi/cpp/sharpi/PotDs3502.cpp
new file mode 100644
index 0000000..d9c7183
--- /dev/null
+++ b/Sharpi/cpp/sharpi/PotDs3502.cpp
@@ -0,0 +1,136 @@
+#include "PotDs3502.h"
+
+string PotDs3502::description =
+"----------------------------------------------\n"
+" Maxim DS3502                                 \n"
+"                                              \n"
+" The DS3502 is a 7-bit, nonvolatile (NV)      \n"
+" digital potentiometer (POT) featuring an     \n"
+" output voltage range of up to 15.5V.         \n"
+" Programming is accomplished by an I2C-       \n"
+" compatible interface, which can operate at   \n"
+" speeds of up to 400kHz.External voltages are \n"
+" applied at the RL and RH inputs to define the\n"
+" lowest and highest potentiometer outputs.    \n"
+" (10 uSOP package)                            \n"
+"                                              \n"
+" I2c slave address adjustable via A0 and A1   \n"
+"                                              \n"
+" A convenient breakout board is available     \n"
+" from Adafruit.                               \n"
+"                                              \n"
+"config:                                       \n"
+"                                              \n"
+"  edit /boot/config.txt                       \n"
+"  dtparam=i2c_arm=on,i2c_arm_baudrate=400000  \n"
+"                                              \n"
+"wiring:                                       \n"
+"                                              \n"
+"       rpi physical pins                      \n"
+"                                              \n"
+"     vin --  1   2                            \n"
+"     sda --  3   4                            \n"
+"     scl --  5   6                            \n"
+"             7   8                            \n"
+"     gnd --  9   10         ----------        \n"
+"   (int) -- 11   12   sda -| +        |- scl  \n"
+"            13   14   gnd -|          |- v+   \n"
+"            15   16   vcc -|  ds3502  |- rl   \n"
+"            17   18    a1 -|          |- rw   \n"
+"            19   20    a0 -|          |- rh   \n"
+"            21   22         ----------        \n"
+"            23   24                           \n"
+"            25   26                           \n"
+"            27   28                           \n"
+"            29   30                           \n"
+"            31   32                           \n"
+"            33   34                           \n"
+"            35   36                           \n"
+"            37   38                           \n"
+"            39   40                           \n"
+"                                              \n"
+"----------------------------------------------\n"
+;
+
+const string PotDs3502::I2CDEVICE = "/dev/i2c-1";
+
+PotDs3502::PotDs3502(uint8_t i2cAddress)
+	: PotDs3502::PotDs3502(i2cAddress, I2CDEVICE)
+{
+}
+
+PotDs3502::PotDs3502(uint8_t i2cAddress, string i2cDevice)
+{
+	_i2cAddress = i2cAddress;
+	_i2cDevice = i2cDevice;
+}
+
+PotDs3502::~PotDs3502()
+{
+}
+
+string PotDs3502::GetDescription()
+{
+	return description;
+};
+
+const char* PotDs3502::GetDescriptionC()
+{
+	return description.c_str();
+}
+
+void PotDs3502::PowerOn()
+{
+	if (_devI2c == NULL)
+	{
+		_devI2c = new DevI2c(_i2cDevice, _i2cAddress);
+		if (!_devI2c->Open())
+		{
+			delete _devI2c;
+			_devI2c = NULL;
+		}
+
+		_devI2c->WriteRegU8(Regs::CR::addr, Regs::CR::Modes::Mode_1_WR_ONLY);
+	}
+}
+
+void PotDs3502::PowerOff()
+{
+	if (_devI2c != NULL)
+	{
+		_devI2c->Close();
+		delete _devI2c;
+		_devI2c = NULL;
+	}
+}
+
+
+uint8_t PotDs3502::GetWiper(void)
+{
+	if (_devI2c == NULL) { return 0; };
+
+	uint8_t value;
+	_devI2c->ReadRegU8(Regs::WR::addr, &value);
+	return value;
+}
+
+void PotDs3502::SetWiper(uint8_t value)
+{
+	if (_devI2c == NULL) { return; };
+
+	if (value > 127) { return; }
+
+	_devI2c->WriteRegU8(Regs::WR::addr, value);
+}
+
+void PotDs3502::SetWiperPersistent(uint8_t value)
+{
+	if (_devI2c == NULL) { return; };
+
+	if (value > 127) { return; }
+
+	_devI2c->WriteRegU8(Regs::CR::addr, Regs::CR::Modes::Mode_0_WR_IVR);
+	_devI2c->WriteRegU8(Regs::WR::addr, value);
+	usleep(20000); // max EEPROM write time 20ms
+	_devI2c->WriteRegU8(Regs::CR::addr, Regs::CR::Modes::Mode_1_WR_ONLY);
+}
\ No newline at end of file
diff --git a/Sharpi/cpp/sharpi/PotDs3502.h b/Sharpi/cpp/sharpi/PotDs3502.h
new file mode 100644
index 0000000..5c67b8d
--- /dev/null
+++ b/Sharpi/cpp/sharpi/PotDs3502.h
@@ -0,0 +1,71 @@
+#pragma once
+
+#include "Pot.h"
+#include "DevI2c.h"
+
+using namespace std;
+
+class PotDs3502 : Pot
+{
+private:
+	static string description;
+
+private:
+	static const string I2CDEVICE;
+
+	string _i2cDevice = I2CDEVICE;
+	DevI2c* _devI2c = NULL;
+	uint8_t _i2cAddress;
+
+public:
+	PotDs3502(uint8_t i2cAddress);
+	PotDs3502(uint8_t i2cAddress, string i2cDevice);
+	~PotDs3502();
+
+	string GetDescription();
+	const char* GetDescriptionC();
+
+	void PowerOn();
+	void PowerOff();
+
+	uint8_t GetWiper(void);
+	void SetWiper(uint8_t value);
+	void SetWiperPersistent(uint8_t value); // 50000 - 200000 EEPROM writes
+
+public:
+	class Regs
+	{
+	public:
+		/// <summary>
+		/// Control Register
+		/// </summary>
+		class CR
+		{
+		public:
+			static const uint8_t addr = 0x02;
+			class Modes
+			{
+			public:
+				enum : uint8_t
+				{
+					/// <summary>
+					/// mode0: write to memory address 00h, write to both WR (Wiper Register) and IVR (Initial Value Register), read from WR
+					/// mode1: write to memory address 00h, write to WR, read from WR, for writing from SRAM to EEPROM an i2c stop must occur
+					/// </summary>
+					Mode_0_WR_IVR = 0x00,
+					Mode_1_WR_ONLY = 0x80
+				};
+			};
+		};
+
+		/// <summary>
+		/// Wiper Register
+		/// </summary>
+		class WR
+		{
+		public:
+			static const uint8_t addr = 0x00;
+			
+		};
+	};
+};
\ No newline at end of file
diff --git a/Sharpi/cpp/sharpi/sharpi.cpp b/Sharpi/cpp/sharpi/sharpi.cpp
index 2df8684..67c5100 100644
--- a/Sharpi/cpp/sharpi/sharpi.cpp
+++ b/Sharpi/cpp/sharpi/sharpi.cpp
@@ -698,4 +698,57 @@ SHARPI void sensor_ir28khz_power_on(csensor* handle)
 SHARPI void sensor_ir28khz_power_off(csensor* handle)
 {
 	((SensorIr28khz*)handle)->PowerOff();
+}
+
+
+// pot common
+
+typedef struct cpot cpot;
+
+SHARPI const char* pot_get_description(cpot* handle)
+{
+	return ((Pot*)handle)->GetDescriptionC();
+}
+
+SHARPI void pot_delete(cpot* handle)
+{
+	delete ((Pot*)handle);
+}
+
+// pot specific
+
+
+SHARPI cpot* pot_ds3502_new(uint8_t i2cAddress)
+{
+	return (cpot*)new PotDs3502(i2cAddress);
+}
+
+SHARPI cpot* pot_ds3502_new_x(uint8_t i2cAddress, string i2cDevice)
+{
+	return (cpot*)new PotDs3502(i2cAddress, i2cDevice);
+}
+
+SHARPI void pot_ds3502_power_on(cpot* handle)
+{
+	((PotDs3502*)handle)->PowerOn();
+}
+
+SHARPI void pot_ds3502_power_off(cpot* handle)
+{
+	((PotDs3502*)handle)->PowerOff();
+}
+
+SHARPI uint8_t pot_ds3502_get_wiper(cpot* handle)
+{
+	return ((PotDs3502*)handle)->GetWiper();
+}
+
+SHARPI void pot_ds3502_set_wiper(cpot* handle, uint8_t value)
+{
+	((PotDs3502*)handle)->SetWiper(value);
+}
+
+SHARPI void pot_ds3502_set_wiper_persistent(cpot* handle, uint8_t value)
+{
+	((PotDs3502*)handle)->SetWiperPersistent(value);
 }
\ No newline at end of file
diff --git a/Sharpi/cpp/sharpi/sharpi.h b/Sharpi/cpp/sharpi/sharpi.h
index 0cb8029..4a249a3 100644
--- a/Sharpi/cpp/sharpi/sharpi.h
+++ b/Sharpi/cpp/sharpi/sharpi.h
@@ -17,6 +17,8 @@
 #include "AdcMcp3008.h"
 #include "SensorAmg8833.h"
 #include "SensorIr28khz.h"
+#include "Pot.h"
+#include "PotDs3502.h"
 
 #include "include/core/SkImageEncoder.h"
 #include "include/core/SkColor.h"
@@ -234,6 +236,25 @@ extern "C" {
 	SHARPI void sensor_ir28khz_power_on(csensor* handle);
 	SHARPI void sensor_ir28khz_power_off(csensor* handle);
 
+	// pot common
+
+	typedef struct cpot cpot;
+
+	SHARPI const char* pot_get_description(cpot* handle);
+	SHARPI void pot_delete(cpot* handle);
+
+	// pot specific
+
+	SHARPI cpot* pot_ds3502_new(uint8_t i2cAddress);
+	SHARPI cpot* pot_ds3502_new_x(uint8_t i2cAddress, string i2cDevice);
+
+	SHARPI void pot_ds3502_power_on(cpot* handle);
+	SHARPI void pot_ds3502_power_off(cpot* handle);
+
+	SHARPI uint8_t pot_ds3502_get_wiper(cpot* handle);
+	SHARPI void pot_ds3502_set_wiper(cpot* handle, uint8_t value);
+	SHARPI void pot_ds3502_set_wiper_persistent(cpot* handle, uint8_t value);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Sharpi/native/libsharpi.so b/Sharpi/native/libsharpi.so
index da07a13..2556453 100644
Binary files a/Sharpi/native/libsharpi.so and b/Sharpi/native/libsharpi.so differ