Humidity Sensor of Graphite - Revision history

Ruizhe: /* Error Analysis */

2025-04-29T01:55:51Z

Error Analysis

← Older revision		Revision as of 09:55, 29 April 2025
Line 183:		Line 183:
	===Error Analysis===		===Error Analysis===
	In our fitting range, there are still tiny turning points. Beyond the influence of opening the door, we now discuss about possible reasons behind this.		In our fitting range, there are still tiny turning points. Beyond the influence of opening the door, we now discuss about possible reasons behind this.

	<b>(1)</b> When we deal with humidity, we need to pay attention to temperature. Temperature significantly affects the accuracy of humidity sensor measurements. As temperature rises, the saturation vapor pressure increases, leading to lower relative humidity for the same amount of water vapor. Additionally, most humidity sensors, such as capacitive or resistive types, exhibit inherent temperature sensitivity, causing potential drift or slower response.		<b>(1)</b> When we deal with humidity, we need to pay attention to temperature. Temperature significantly affects the accuracy of humidity sensor measurements. As temperature rises, the saturation vapor pressure increases, leading to lower relative humidity for the same amount of water vapor. Additionally, most humidity sensors, such as capacitive or resistive types, exhibit inherent temperature sensitivity, causing potential drift or slower response.

Ruizhe: /* Error Analysis */

2025-04-29T01:55:39Z

Error Analysis

← Older revision		Revision as of 09:55, 29 April 2025
Line 182:		Line 182:

	===Error Analysis===		===Error Analysis===
	Beyond the		In our fitting range, there are still tiny turning points. Beyond the influence of opening the door, we now discuss about possible reasons behind this.
	<b>(1)</b> When we deal with humidity, we need to pay attention to temperature. Temperature significantly affects the accuracy of humidity sensor measurements. As temperature rises, the saturation vapor pressure increases, leading to lower relative humidity for the same amount of water vapor. Additionally, most humidity sensors, such as capacitive or resistive types, exhibit inherent temperature sensitivity, causing potential drift or slower response.		<b>(1)</b> When we deal with humidity, we need to pay attention to temperature. Temperature significantly affects the accuracy of humidity sensor measurements. As temperature rises, the saturation vapor pressure increases, leading to lower relative humidity for the same amount of water vapor. Additionally, most humidity sensors, such as capacitive or resistive types, exhibit inherent temperature sensitivity, causing potential drift or slower response.

	DHT11 can give the temperature, with <math>\pm 5\ ^\circ \mathrm{C}</math>		DHT11 can give the temperature, with <math>\pm 5\ ^\circ \mathrm{C}</math> error. In our Arduino Code, we also record the temperature. It turns out the temperature output shows tiny shift during measurement. The range is between 21.8 to 23.0. This is mainly caused by hot water vapor. This may influence the sensor response.

			<b>(2)</b> In the resistance measurement, we use Arduino as the power source. The signal we measure in Arduino is initially shown ass an integer from 0 to 1023. Discrete values limits the sensibility of our resistance measurement. Meanwhile, the 5V output is not stable. We record the voltage between '5V' and 'GND' link on Arduino. The output will shift between 1021 to 1023. The possible reason is Arduino is supplied by the USB interface of our computer. This will influence the resistance calculation.

	==Reference==		==Reference==

Ruizhe: /* Error Analysis */

2025-04-29T01:43:50Z

Error Analysis

← Older revision		Revision as of 09:43, 29 April 2025
Line 182:		Line 182:

	===Error Analysis===		===Error Analysis===
			Beyond the
			<b>(1)</b> When we deal with humidity, we need to pay attention to temperature. Temperature significantly affects the accuracy of humidity sensor measurements. As temperature rises, the saturation vapor pressure increases, leading to lower relative humidity for the same amount of water vapor. Additionally, most humidity sensors, such as capacitive or resistive types, exhibit inherent temperature sensitivity, causing potential drift or slower response.

			DHT11 can give the temperature, with <math>\pm 5\ ^\circ \mathrm{C}</math>

	==Reference==		==Reference==

Ruizhe: /* Error Analysis= */

2025-04-29T01:40:06Z

Error Analysis=

← Older revision		Revision as of 09:40, 29 April 2025
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	This study demonstrated the humidity sensitivity of pencil graphite sensors, highlighting their potential for reliable humidity monitoring. The results indicated that the resistance of conventional graphite sensors increased with humidity. Data fitting was applied to establish functional relationships that convert sensor resistance into relative humidity values.		This study demonstrated the humidity sensitivity of pencil graphite sensors, highlighting their potential for reliable humidity monitoring. The results indicated that the resistance of conventional graphite sensors increased with humidity. Data fitting was applied to establish functional relationships that convert sensor resistance into relative humidity values.

	===Error Analysis====		===Error Analysis===

	==Reference==		==Reference==

Ruizhe: /* Comparison between S1 and S2 */

2025-04-29T01:39:46Z

Comparison between S1 and S2

← Older revision		Revision as of 09:39, 29 April 2025
Line 174:		Line 174:

	===Comparison between S1 and S2===		===Comparison between S1 and S2===
	In the above ~~dicussion~~, we mainly use one sample. We now prepare another Graphite Sensor sample to verify the conclusion. This Sensor has different length compared with S1. The R-H curve shows the similar relationship. Below 50% humidity, there is lots of turning points. We do the fitting between 50 to 80% humidity. The result shows R^2=0.997. In conclusion, the exponential function satisfies the R-H curve well.		In the above discussion, we mainly use one sample. We now prepare another Graphite Sensor sample to verify the conclusion. This Sensor has different length compared with S1. This leads to a different resistance range. The R-H curve shows the similar relationship. Below 50% humidity, there is lots of turning points. We do the fitting between 50 to 80% humidity. The result shows R^2=0.997. In conclusion, the exponential function satisfies the R-H curve well.
	<center>[[File:Comparsion.jpg\|400px]]</center>		<center>[[File:Comparsion.jpg\|400px]]</center>
	<center>'''Comparison between S1 and S2'''</center>		<center>'''Comparison between S1 and S2'''</center>

Ruizhe: /* Comparison between S1 and S2= */

2025-04-29T01:39:04Z

Comparison between S1 and S2=

← Older revision		Revision as of 09:39, 29 April 2025
Line 173:		Line 173:
	The result shows a good fitting with R^2=0.995. We expect this as the R-H relationship for the Graphite Sensor.		The result shows a good fitting with R^2=0.995. We expect this as the R-H relationship for the Graphite Sensor.

	===Comparison between S1 and S2====		===Comparison between S1 and S2===
	In the above dicussion, we mainly use one sample. We now prepare another Graphite Sensor sample to verify the conclusion. This Sensor has different length compared with S1. The R-H curve shows the similar relationship. Below 50% humidity, there is lots of turning points. We do the fitting between 50 to 80% humidity. The result shows R^2=0.997. In conclusion, the exponential function satisfies the R-H curve well.		In the above dicussion, we mainly use one sample. We now prepare another Graphite Sensor sample to verify the conclusion. This Sensor has different length compared with S1. The R-H curve shows the similar relationship. Below 50% humidity, there is lots of turning points. We do the fitting between 50 to 80% humidity. The result shows R^2=0.997. In conclusion, the exponential function satisfies the R-H curve well.
	<center>[[File:Comparsion.jpg\|400px]]</center>		<center>[[File:Comparsion.jpg\|400px]]</center>

Ruizhe: /* Comparison between S1 and S2= */

2025-04-29T01:38:55Z

Comparison between S1 and S2=

← Older revision		Revision as of 09:38, 29 April 2025
Line 174:		Line 174:

	===Comparison between S1 and S2====		===Comparison between S1 and S2====
	In the above dicussion, we mainly use one sample. We		In the above dicussion, we mainly use one sample. We now prepare another Graphite Sensor sample to verify the conclusion. This Sensor has different length compared with S1. The R-H curve shows the similar relationship. Below 50% humidity, there is lots of turning points. We do the fitting between 50 to 80% humidity. The result shows R^2=0.997. In conclusion, the exponential function satisfies the R-H curve well.
	<center>[[File:Comparsion.jpg\|400px]]</center>		<center>[[File:Comparsion.jpg\|400px]]</center>
	<center>'''~~Raise Humidity~~'''</center>		<center>'''Comparison between S1 and S2'''</center>

	==Discussion==		==Discussion==

Ruizhe: /* Comparison between S1 and S2= */

2025-04-29T01:34:23Z

Comparison between S1 and S2=

← Older revision		Revision as of 09:34, 29 April 2025
Line 175:		Line 175:
	===Comparison between S1 and S2====		===Comparison between S1 and S2====
	In the above dicussion, we mainly use one sample. We		In the above dicussion, we mainly use one sample. We
	<center>[[File:~~Raise~~.jpg\|400px]]</center>		<center>[[File:Comparsion.jpg\|400px]]</center>
	<center>'''Raise Humidity'''</center>		<center>'''Raise Humidity'''</center>

Ruizhe: /* Comparison between S1 and S2= */

2025-04-29T01:34:07Z

Comparison between S1 and S2=

← Older revision		Revision as of 09:34, 29 April 2025
Line 175:		Line 175:
	===Comparison between S1 and S2====		===Comparison between S1 and S2====
	In the above dicussion, we mainly use one sample. We		In the above dicussion, we mainly use one sample. We
			<center>[[File:Raise.jpg\|400px]]</center>
			<center>'''Raise Humidity'''</center>

	==Discussion==		==Discussion==

Ruizhe: /* Results */

2025-04-29T01:33:35Z

Results

← Older revision		Revision as of 09:33, 29 April 2025
Line 172:		Line 172:

	The result shows a good fitting with R^2=0.995. We expect this as the R-H relationship for the Graphite Sensor.		The result shows a good fitting with R^2=0.995. We expect this as the R-H relationship for the Graphite Sensor.

			===Comparison between S1 and S2====
			In the above dicussion, we mainly use one sample. We

	==Discussion==		==Discussion==