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ERIC Number: EJ1057056
Record Type: Journal
Publication Date: 2015-Apr
Pages: 2
Abstractor: As Provided
Reference Count: 5
ISSN: ISSN-0031-921X
Photogate Timing with a Smartphone
Forinash, Kyle; Wisman, Raymond F.
Physics Teacher, v53 n4 p234-235 Apr 2015
In a previous article we demonstrated that a simple, passive external circuit incorporating a thermistor, connected to a mobile device through the headset jack, can be used to collect temperature data. The basic approach is to output a sine wave signal to the headset port, through the circuit, and input the resulting signal from the headset microphone. By replacing the thermistor with other variable resistors, the circuit can perform other data measurements. A photoresistor in the circuit will change the amplitude of the returning signal by varying the resistance, depending upon the intensity of light reaching it. The circuit used is shown in Fig. 1 (a discussion of alternative circuits is given in Ref. 2). Two or more photoresistors can be placed in series to form multiple photogates, as shown in Fig. 2. The photoresistors used here have a resistance of about 120 kO in the dark and 5 kO under lamp light. Ordinary household lamps were used as light sources.
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A