diff --git a/README.md b/README.md
index 885845b3..ccde5f4e 100644
--- a/README.md
+++ b/README.md
@@ -283,6 +283,10 @@ https://github.com/neu-rah/AnsiStream
 
 - Unix terminal
 
+**Grove RGB LCD I2C 2x16**
+
+https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
+
 **Web browser**
 
 - ESP8266 (builtin)  
diff --git a/examples/GroveRGB/GroveRGB/GroveRGB.ino b/examples/GroveRGB/GroveRGB/GroveRGB.ino
new file mode 100644
index 00000000..33a57a67
--- /dev/null
+++ b/examples/GroveRGB/GroveRGB/GroveRGB.ino
@@ -0,0 +1,207 @@
+#include <Arduino.h>
+
+/********************
+Sept. 2014 Rui Azevedo - ruihfazevedo(@rrob@)gmail.com
+Nov. 2020 Graham Whaley - adapted to Grove RGB LCD
+
+menu output to Grove RGB LCD I2C
+output: GROVERGBLCD : https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
+input: click encoder and Serial
+board: PJRC Teensy 4.0 : https://www.pjrc.com/store/teensy40.html
+***/
+
+#include <Wire.h>
+#include <menu.h>
+#include <menuIO/groveRGBLCDOut.h>
+#include <menuIO/serialOut.h>
+#include <menuIO/serialIn.h>
+#include <menuIO/clickEncoderIn.h>
+#include <menuIO/chainStream.h>
+
+using namespace Menu;
+
+// LCD, standard Grove I2C devices /////////////
+rgb_lcd lcd;
+
+// Encoder /////////////////////////////////////
+#define encA 3
+#define encB 2
+//this encoder has a button here
+#define encBtn 4
+
+ClickEncoder clickEncoder(encA,encB,encBtn,2);
+ClickEncoderStream encStream(clickEncoder,1);
+
+//input from the clickencoder + serial
+serialIn serial(Serial);
+menuIn* inputsList[]={&encStream,&serial};
+chainStream<2> in(inputsList);//3 is the number of inputs
+
+#define LEDPIN LED_BUILTIN   //Teensy 4.0 LED pin
+
+result doAlert(eventMask e, prompt &item);
+
+result showEvent(eventMask e,navNode& nav,prompt& item) {
+  Serial.print("event: ");
+  Serial.println(e);
+  return proceed;
+}
+
+int test=55;
+
+result action1(eventMask e,navNode& nav, prompt &item) {
+  Serial.print("action1 event: ");
+  Serial.print(e);
+  Serial.println(", proceed menu");
+  Serial.flush();
+  return proceed;
+}
+
+result action2(eventMask e,navNode& nav, prompt &item) {
+  Serial.print("action2 event: ");
+  Serial.print(e);
+  Serial.print(", quiting menu.");
+  Serial.flush();
+  return quit;
+}
+
+int ledCtrl=LOW;
+
+result myLedOn() {
+  ledCtrl=HIGH;
+  return proceed;
+}
+result myLedOff() {
+  ledCtrl=LOW;
+  return proceed;
+}
+
+TOGGLE(ledCtrl,setLed,"Led: ",doNothing,noEvent,noStyle//,doExit,enterEvent,noStyle
+  ,VALUE("On",HIGH,doNothing,noEvent)
+  ,VALUE("Off",LOW,doNothing,noEvent)
+);
+
+int selTest=0;
+SELECT(selTest,selMenu,"Select",doNothing,noEvent,noStyle
+  ,VALUE("Zero",0,doNothing,noEvent)
+  ,VALUE("One",1,doNothing,noEvent)
+  ,VALUE("Two",2,doNothing,noEvent)
+);
+
+int chooseTest=-1;
+CHOOSE(chooseTest,chooseMenu,"Choose",doNothing,noEvent,noStyle
+  ,VALUE("First",1,doNothing,noEvent)
+  ,VALUE("Second",2,doNothing,noEvent)
+  ,VALUE("Third",3,doNothing,noEvent)
+  ,VALUE("Last",-1,doNothing,noEvent)
+);
+
+//customizing a prompt look!
+//by extending the prompt class
+class altPrompt:public prompt {
+public:
+  altPrompt(constMEM promptShadow& p):prompt(p) {}
+  Used printTo(navRoot &root,bool sel,menuOut& out, idx_t idx,idx_t len,idx_t) override {
+    return out.printRaw(F("special prompt!"),len);;
+  }
+};
+
+MENU(subMenu,"Sub-Menu",showEvent,anyEvent,noStyle
+  ,OP("Sub1",showEvent,anyEvent)
+  ,OP("Sub2",showEvent,anyEvent)
+  ,OP("Sub3",showEvent,anyEvent)
+  ,altOP(altPrompt,"",showEvent,anyEvent)
+  ,EXIT("<Back")
+);
+
+/*extern menu mainMenu;
+TOGGLE((mainMenu[1].enabled),togOp,"Op 2:",doNothing,noEvent,noStyle
+  ,VALUE("Enabled",enabledStatus,doNothing,noEvent)
+  ,VALUE("disabled",disabledStatus,doNothing,noEvent)
+);*/
+
+// char* constMEM hexDigit MEMMODE="0123456789ABCDEF";
+// char* constMEM hexNr[] MEMMODE={"0","x",hexDigit,hexDigit};
+// char buf1[]="0x11";
+
+MENU(mainMenu,"Main menu",doNothing,noEvent,wrapStyle
+  ,OP("Op1",action1,anyEvent)
+  ,OP("Op2",action2,enterEvent)
+  //,SUBMENU(togOp)
+  ,FIELD(test,"Test","%",0,100,10,1,doNothing,noEvent,wrapStyle)
+  ,SUBMENU(subMenu)
+  ,SUBMENU(setLed)
+  ,OP("LED On",myLedOn,enterEvent)
+  ,OP("LED Off",myLedOff,enterEvent)
+  ,SUBMENU(selMenu)
+  ,SUBMENU(chooseMenu)
+  ,OP("Alert test",doAlert,enterEvent)
+  // ,EDIT("Hex",buf1,hexNr,doNothing,noEvent,noStyle)
+  ,EXIT("<Back")
+);
+
+//const panel panels[] MEMMODE={{0,0,16,2}};
+//navNode* nodes[sizeof(panels)/sizeof(panel)];
+//panelsList pList(panels,nodes,1);
+
+#define MAX_DEPTH 2
+/*idx_t tops[MAX_DEPTH];
+liquidCrystalOut outLCD(lcd,tops,pList);//output device for LCD
+menuOut* constMEM outputs[] MEMMODE={&outLCD};//list of output devices
+outputsList out(outputs,1);//outputs list with 2 outputs*/
+
+MENU_OUTPUTS(out, MAX_DEPTH
+  ,GROVERGBLCD_OUT(lcd, {0, 0, 16, 2})
+  ,NONE
+);
+NAVROOT(nav,mainMenu,MAX_DEPTH,in,out);//the navigation root object
+
+result alert(menuOut& o,idleEvent e) {
+  if (e==idling) {
+    o.setCursor(0,0);
+    o.print("alert test");
+    o.setCursor(0,1);
+    o.print("[select] to continue...");
+  }
+  return proceed;
+}
+
+result doAlert(eventMask e, prompt &item) {
+  nav.idleOn(alert);
+  return proceed;
+}
+
+result idle(menuOut& o,idleEvent e) {
+  switch(e) {
+    case idleStart:o.print("suspending menu!");break;
+    case idling:o.print("suspended...");break;
+    case idleEnd:o.print("resuming menu.");break;
+  }
+  return proceed;
+}
+
+void setup() {
+  pinMode(encBtn,INPUT_PULLUP);
+  pinMode(LEDPIN,OUTPUT);
+  Serial.begin(115200);
+  while(!Serial);
+  Serial.println("Arduino Menu Library");Serial.flush();
+
+  lcd.begin(16,2);
+  lcd.setRGB(32, 32, 32);
+  nav.idleTask=idle;//point a function to be used when menu is suspended
+  mainMenu[1].enabled=disabledStatus;
+  nav.showTitle=false;
+  lcd.setCursor(0, 0);
+  lcd.print("Menu 4.x LCD");
+  lcd.setCursor(0, 1);
+  lcd.print("r-site.net");
+  delay(2000);
+}
+
+void loop() {
+  clickEncoder.service();
+  nav.poll();
+  digitalWrite(LEDPIN, ledCtrl);
+  delay(100);//simulate a delay as if other tasks are running
+}
diff --git a/src/macros.h b/src/macros.h
index 3ec94f23..18b83ddd 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -89,6 +89,7 @@
 #define ANSISERIAL_OUT(...) ON(ANSISERIAL_OUT,__COUNTER__,__VA_ARGS__)
 #define LIQUIDCRYSTAL_OUT(...) ON(LIQUIDCRYSTAL_OUT,__COUNTER__,__VA_ARGS__)
 #define LCD_OUT(...) ON(LCD_OUT,__COUNTER__,__VA_ARGS__)
+#define GROVERGBLCD_OUT(...) ON(GROVERGBLCD_OUT,__COUNTER__,__VA_ARGS__)
 #define ADAGFX_OUT(...) ON(ADAGFX_OUT,__COUNTER__,__VA_ARGS__)
 #define TFT_eSPI_OUT(...) ON(TFT_eSPI_OUT,__COUNTER__,__VA_ARGS__)
 #define TFT_OUT(...) ON(TFT_OUT,__COUNTER__,__VA_ARGS__)
@@ -123,6 +124,11 @@ Menu::idx_t id##Tops##n[md];\
 PANELS(id##Panels##n,__VA_ARGS__);\
 Menu::lcdOut id##n(&device,id##Tops##n,id##Panels##n);
 
+#define VAR_GROVERGBLCD_OUT(id,md,n,device,...)\
+Menu::idx_t id##Tops##n[md];\
+PANELS(id##Panels##n,__VA_ARGS__);\
+Menu::grovergblcdOut id##n(&device,id##Tops##n,id##Panels##n);
+
 #define VAR_ADAGFX_OUT(id,md,n,gfx,color,fontW,fontH,...)\
 Menu::idx_t id##Tops##n[md];\
 PANELS(id##Panels##n,__VA_ARGS__);\
@@ -173,6 +179,7 @@ Menu::utftOut id##n(gfx,color,id##Tops##n,id##Panels##n,fontW,fontH);
 #define REF_ANSISERIAL_OUT(id,md,n,...) &id##n,
 #define REF_LIQUIDCRYSTAL_OUT(id,md,n,...) &id##n,
 #define REF_LCD_OUT(id,md,n,...) &id##n,
+#define REF_GROVERGBLCD_OUT(id,md,n,...) &id##n,
 #define REF_ADAGFX_OUT(id,md,n,...) &id##n,
 #define REF_TFT_eSPI_OUT(id,md,n,...) &id##n,
 #define REF_U8GLIB_OUT(id,md,n,...) &id##n,
diff --git a/src/menuIO/groveRGBLCDOut.h b/src/menuIO/groveRGBLCDOut.h
new file mode 100644
index 00000000..a627c597
--- /dev/null
+++ b/src/menuIO/groveRGBLCDOut.h
@@ -0,0 +1,52 @@
+/* -*- C++ -*- */
+
+//for using the Grove 2x16 RGB LCD i2c
+// https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
+// https://github.com/Seeed-Studio/Grove_LCD_RGB_Backlight
+// Uses default I2C device addresses on default I2C bus
+
+#ifndef RSITE_ARDUINO_MENU_GROVERGBLCDOUT
+  #define RSITE_ARDUINO_MENU_GROVERGBLCDOUT
+
+  #ifndef ARDUINO_SAM_DUE
+    #include "../menuDefs.h"
+    #include <Wire.h>
+    #include <rgb_lcd.h>
+
+    namespace Menu {
+
+      class grovergblcdOut:public cursorOut {
+        public:
+          rgb_lcd* device;
+          inline grovergblcdOut(rgb_lcd* o,idx_t *t,panelsList &p,menuOut::styles s=menuOut::minimalRedraw)
+            :cursorOut(t,p,s),device(o) {}
+          size_t write(uint8_t ch) override {return device->write(ch);}
+          void clear() override {
+            device->clear();
+            panels.reset();
+          }
+          void setCursor(idx_t x,idx_t y,idx_t panelNr=0) override {
+            const panel p=panels[panelNr];
+            device->setCursor(p.x+x,p.y+y);
+          }
+          idx_t startCursor(navRoot& root,idx_t x,idx_t y,bool charEdit,idx_t panelNr=0) override {return 0;}
+          idx_t endCursor(navRoot& root,idx_t x,idx_t y,bool charEdit,idx_t panelNr=0) override {return 0;}
+          idx_t editCursor(navRoot& root,idx_t x,idx_t y,bool editing,bool charEdit,idx_t panelNr=0) override {
+            trace(MENU_DEBUG_OUT<<"lcdOut::editCursor "<<x<<","<<y<<endl);
+            //text editor cursor
+            device->noBlink();
+            device->noCursor();
+            if (editing) {
+              device->setCursor(x, y);
+              if (charEdit) device->cursor();
+              else device->blink();
+            }
+            return 0;
+          }
+
+      };
+
+    }//namespace Menu
+
+  #endif
+#endif