SCHEMATICS A Fritzing Diagram showing the electrical connections from the EC Sensor wires to the Arduino analog input pin A0. You are also welcome to use our sketch which is provided in the Attachments section. If you are comfortable writing Arduino code, use the analog input pins to measure the voltage changes across the EC sensor. Connect your alligator clips to the Arduino Uno as shown in the Attachments section. You care now ready to connect to your microcontroller. Attach alligator clips to the bent wires. This gives the alligator clips a better connection once attached. Bend the longer ends of the wire as shown in the photo above. attach to the end of the straw! This will act as a shield guard for the sensor wire ends. Measure and cut your other length of straw at 4 cm Cut the 4cm straw in half, then dab some hot glue on the end and. Dab some hot glue inside both ends of the straw. Measure to make sure your wires stick out of the end of the straw at the 1.5 cm mark. Push the stir sticks with wire into your 14 cm straw. Tape the middle and opposite ends of the sticks to hold the wire in place keeping the wires centered on the sticks. Center your other wire opposite the first. Place the wire on the stir stick so that it is centered and the ends extend about 1.75 cm beyond the stir stick. Straighten out the wires the best you can. Measure and cut two lengths of 17 cm stainless steel wire. Quickly press the sticks together until the glue has cooled. Using your hot glue gun, run a thin line of glue along the length of one of your stir sticks. Next, mark both of your coffee stir sticks at 13 cm and make cuts. Build an Electroconductivity Meter Mark your straw at 14 cm. The air gap allows us to test how well a material or substance conducts electricity. It can also be used as a (short-term) soil moisture sensor! This sensor is made of two wires separated by an air gap. 220 Fun Projects with Arduino 1) Arduino Hacking STEM Electroconductivity Meter COMPONENTS AND SUPPLIES biodegradable straw × 1 × 2 coffee stir stick stainless steel wire (28 gauge, 17cm) × 2 × 2 × 1 × 1 × 1 pin-ended alligator clips Resistor 100 ohm Arduino UNO & Genuino UNO USB-A to B Cable NECESSARY TOOLS AND MACHINES scissors Wire Stripper & Cutter, 18-10 AWG / 0.754mm² Capacity Wires Hot glue gun (generic) Tape, Clear ruler APPS AND ONLINE SERVICES Microsoft Data Streamer Arduino IDE Microsoft Excel ABOUT THIS PROJECT This project aimed to meet the requirements of the science fair that happened in my city Our electroconductivity sensor was designed as a simple way to measure the amounts of dissolved substances in different water samples.
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