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diff --git a/OpenPLC_version_1/Experiments/1_LED-PLC/LED.rst b/OpenPLC_version_1/Experiments/1_LED-PLC/LED.rst
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+Light Emitting Diode
+====================
+
+Overview
+--------
+
+LEDs (light emitting diodes) are used in all sorts of 
+clever things which is why we have induced them in the kit.
+We will start off with something very simple, turning one 
+ON and OFF, repeatedly,producing a pleasant blinking effect. 
+In the ld micro insert coil and insert contacts and also 
+insert Ton and Toff and give particular timings for both. 
+Burn the code to OpenPLC and watch the output
+
+
+Components required
+-------------------
+
+OpenPLC board
+
+
+blinking of LED
+---------------
+
+For blinking of LED we use timers in ldmicro, On timer(Ton) and Off timer(Toff). The LED is connected to pin 35 on the board. 
+The code blinkin.ld illustrates above logic.
+
+switch on LED
+-------------
+
+We can control on/off LED by using an input to the PLC. The input switch is connnected to pin 1 and LED is connedted to the same pin 35.
+The code for this experiment is switch-led.ld
diff --git a/OpenPLC_version_1/Experiments/1_LED-PLC/blinking.ld b/OpenPLC_version_1/Experiments/1_LED-PLC/blinking.ld
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+LDmicro0.1
+MICRO=Atmel AVR ATmega16 40-PDIP
+CYCLE=10000
+CRYSTAL=4000000
+BAUD=2400
+COMPILED=Z:\home\nivedita\Downloads\LLED.hex
+
+IO LIST
+    Yled at 3
+END
+
+PROGRAM
+RUNG
+    CONTACTS Rosc 0
+    TON Ton 1000000
+    TOF Toff 1000000
+    COIL Rosc 1 0 0
+END
+RUNG
+    CONTACTS Rosc 0
+    COIL Yled 0 0 0
+END