 Good morning! Today we are going to do some demonstration on the energy harvesting features of the SD25DV NFC dynamic tag. We use the SD25DV discovery with antenna C1 which is a good card size antenna. We also use antenna C5 slightly small antenna. We use the typical Galaxy S8 phone and also the SD25R3911B as a source of RF energy. Okay before we start to look into the how much energy is being harvested using the hardware. I want to remind you about the power transfer over RF. If the antenna is around this small, it is ideal that this is the tag antenna. It will be ideal that the read antenna is about the same size. This is ideal. So the read antenna can be either a NFC phone or a commercial reader and the tag antenna is of the SD25DV. Now if you have a fairly large reader antenna, right, and then you have a fairly small tag antenna, the energy transfer wouldn't be as great because the field strength is right around the conductor and it radiated outward and so on. So there will be field inside the interior of the antenna but it won't be as strong as it is if it's near the conductor of the reader antenna. So keep that in mind as we progress through our experimentation. So how do we get to the energy harvesting section of the SD25DV? When you first start it, plug in USB port, either port will work by the way. You hit the black button to reset the board and then you will hit SD25DV and you go to energy harvesting. Now you take your phone closer and go to you can read. Notice the amber light, the LED turns on. So use that as a guy as the phone is further away from the antenna. It will start flashing when it's not as well coupled but when it's really coupled it will stay lit pretty brightly. And you can move your phone around so that you can actually see difference in energy harvesting and where the energy is strong and weak and how much power you can harness from this configuration. Now we use a small antenna and you can compare the two so that you can see how much energy is harvesting using the small antenna versus the large antenna. Also I like to use the SD25R3911B development board, discovery board. Set for polling mode. I can start seeing the difference. As you can see even at the very far range, the longer range, the LEDs is lit quite brightly. You will see the maximum power and go pretty high versus the phone and using a smaller antenna. Okay so in conclusion use the SD25DV as an exit mean to measure our fuel power and use it to determine different antenna size and different reader can produce different results. Thank you.