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Solar Energy Labs – Part 1

Solar Energy Labs – Part 1. ENGR 1181. Today's Learning Objectives. After today's class, students will be able to: Describe and build both a calibration and solar meter circuit Convert decimal values to binary values Discuss how a potentiometer works

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Solar Energy Labs – Part 1

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  1. Solar Energy Labs – Part 1 ENGR 1181

  2. Today's Learning Objectives • After today's class, students will be able to: • Describe and build both a calibration and solar meter circuit • Convert decimal values to binary values • Discuss how a potentiometer works • Explain how a photodiode light sensor works • Compare a pictorial image of a circuit to a schematic wiring diagram • Use a Photodiode Light Sensor and a Binary Voltmeter circuit to measure the intensity of light (in Watts/m2)

  3. Solar Energy Meter In lab today, you will build a solar energy meter circuit to measure the energy intensity from a light source. Output : watts/m2 solar energy meter

  4. Solar Energy Meter Parts • 5 Volt power supply • DMM • Breadboard

  5. Solar Energy Meter Circuit Schematic and Breadboard Layout – Final Circuit

  6. Note DMM usage here Breadboard Setup Build now in pairs! Gnd Measure the Power Supply Voltage, V = ______ Volts +5V Note jumpers

  7. Calibrate the Binary Voltmeter

  8. TrimPot – varies input voltage • Total resistance (Pin 1 to Pin 3) = 10 kOhms • Resistance at Pin 2 varies by turning the small adjustment screw (0 to +5V on Pin 2) • Use it to change the input voltage to the Binary Voltmeter circuit • It is a variable resistor. Pins 1 2 3

  9. 8-Bit Binary Display MSB LSB • The LEDs at the output of the Binary Voltmeter are labeled from D7 to D0 • The LEDs have two digital states, on and off, representing the binary numbers “1” and “0” • D7 is the Most Significant Bit (MSB). D0 is the Least Significant Bit (LSB) • The 8-bit binary number can be converted to a decimal number using a formula

  10. 8-bit Binary Numbers For example, convert binary 0 0 0 0 0 1 0 1 into a decimal: 00000101 = 5 MSB LSB …. + 0*23 + 1*22 + 0*21 + 1*20 = 5

  11. The Calibration Circuit • Place the TrimPot as shown and: • Connect Pin 1 to Ground • Connect Pin 3 to +5 Volts • Connect Pin 2 to V Input on the Binary Voltmeter • Connect the LEDs • Connect the Red DMM wire to V Input +5V Gnd Short wire of LEDs must be toward ground side

  12. Calibrate the Binary Voltmeter CircuitTable A – record and store in lab spreadsheet

  13. Solar Energy Meter Circuit Schematic and Layout

  14. Task 3 – How the Light Sensor Works • The Photodiode converts light photons to a current • The Amplifier converts the current to a voltage • The voltage output of the Light Sensor Board is proportional to the intensity of sunlight (Isolar, Watts / m2) Isolar Amplifier Photodiode V Output • The calibration equation for the Solar Light Meter is: • Isolar = 5.0 Ndecimal (Watts / m2)

  15. Use the Solar Energy Meter to measure the intensity of a light source Comment on shading LEDS and Blinking on least significant digits • Place the spotlight in the ring stand so that the front of the bulb is 13 inches away from the top of the Light Sensor. • Make sure that the Photodiode is directly in the center of the beam. • Measure the Intensity of the light source at distances of 23, 19, 15, 11 and 7 inches.

  16. Measure the Intensity of the Light Source at various distances

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