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university:courses:electronics:electronics-lab-eh [14 Dec 2012 21:44] – [For further reading:] Doug Mercer | university:courses:electronics:electronics-lab-eh [03 Nov 2021 20:35] (current) – [Activity: Energy Harvesting] Doug Mercer | ||
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- | ====== Activity: Energy Harvesting ====== | + | ======Activity: |
===== Objective: ===== | ===== Objective: ===== | ||
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Energy harvesters provide only a very small amount of power for low-energy electronics. While the energy source for grid-scale generation plants costs money (oil, coal, gas etc.), the energy source for energy harvesters is present in the ambient background and is thus free. | Energy harvesters provide only a very small amount of power for low-energy electronics. While the energy source for grid-scale generation plants costs money (oil, coal, gas etc.), the energy source for energy harvesters is present in the ambient background and is thus free. | ||
- | The piezoelectric transducer, LDT0 supplied in the Analog Parts Kit is a flexible film device laminated to a polymer substrate. Two crimped contacts for mounting and electrical connections are provided. When the device is bent or displaced from its neutral position, a very high strain is generated in the piezo-polymer and a high voltage is generated. As a vibration sensor the LDT0 has a sensitivity of 50 mV/g. An electrical model of a typical piezoelectric device is shown in figure 1. | + | The piezoelectric transducer, LDT0 supplied in the ADALP2000 |
{{ : | {{ : | ||
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===== Materials: ===== | ===== Materials: ===== | ||
- | Analog Discovery Instrument\\ | + | ADALM2000 Active Learning Module\\ |
Solder-less Breadboard\\ | Solder-less Breadboard\\ | ||
2 - small signal diode (1N914 or similar)\\ | 2 - small signal diode (1N914 or similar)\\ | ||
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===== Procedure: ===== | ===== Procedure: ===== | ||
- | Connect the Analog Discovery | + | Connect the ADALM2000 |
The large but still finite 1 megaohm input resistance of the scope channel will load down the peak voltage generated by the transducer. Remove the connection to scope channel 1 and again rapidly flick the transducer. The DC voltage seen at the output should be significantly higher now. | The large but still finite 1 megaohm input resistance of the scope channel will load down the peak voltage generated by the transducer. Remove the connection to scope channel 1 and again rapidly flick the transducer. The DC voltage seen at the output should be significantly higher now. | ||
- | {{ : | + | {{: |
<WRAP centeralign> | <WRAP centeralign> |