Temperature and humidity sensors - Revision history

Fangye: /* Analysis and Conclusion */

2025-04-08T11:34:27Z

Analysis and Conclusion

← Older revision		Revision as of 19:34, 8 April 2025
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	===Analysis and Conclusion===		===Analysis and Conclusion===

	✅ Final Analysis Based on Project Goals and Experimental Results		🔹 Final Analysis Based on Project Goals and Experimental Results

	The objective of this project was to compare two temperature and humidity sensors'''DHT11''' and '''SHT31-DIS''' under real-world conditions, focusing on their '''cost-effectiveness''', '''ease of integration''', and '''basic accuracy''' in different environments including outdoor, indoor, and rainy conditions.		The objective of this project was to compare two temperature and humidity sensors'''DHT11''' and '''SHT31-DIS''' under real-world conditions, focusing on their '''cost-effectiveness''', '''ease of integration''', and '''basic accuracy''' in different environments including outdoor, indoor, and rainy conditions.

	✅ Strengths of DHT11		🔹 Strengths of DHT11

	Despite being known as a low-cost and entry-level sensor, the DHT11 performed surprisingly well in our experiment and demonstrated the following strengths:		Despite being known as a low-cost and entry-level sensor, the DHT11 performed surprisingly well in our experiment and demonstrated the following strengths:
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	* '''Highly cost-effective''': One of its greatest advantages is the ability to deliver useful data at a '''very low cost''', making it ideal for '''low-budget or large-scale sensor networks'''.		* '''Highly cost-effective''': One of its greatest advantages is the ability to deliver useful data at a '''very low cost''', making it ideal for '''low-budget or large-scale sensor networks'''.

	✅ Comparison with SHT31-DIS		🔹 Comparison with SHT31-DIS

	While the SHT31-DIS clearly offers better '''accuracy''', '''faster response''', and '''broader working range''', our experiment results indicate that the DHT11 still performs well in many practical scenarios, especially when the environmental conditions are stable. Its performance-to-cost ratio is impressive, particularly for general monitoring purposes.		While the SHT31-DIS clearly offers better '''accuracy''', '''faster response''', and '''broader working range''', our experiment results indicate that the DHT11 still performs well in many practical scenarios, especially when the environmental conditions are stable. Its performance-to-cost ratio is impressive, particularly for general monitoring purposes.

	✅ Conclusion		🔹 Conclusion

	Although the SHT31-DIS is a better choice for high-precision or industrial applications, the DHT11 '''fully meets the goals of this project''' — providing a practical, reliable, and affordable solution for basic temperature and humidity monitoring. Based on our experimental data and project objectives, we conclude that '''DHT11 is a highly viable option when simplicity, affordability, and sufficient accuracy are prioritized'''.		Although the SHT31-DIS is a better choice for high-precision or industrial applications, the DHT11 '''fully meets the goals of this project''' — providing a practical, reliable, and affordable solution for basic temperature and humidity monitoring. Based on our experimental data and project objectives, we conclude that '''DHT11 is a highly viable option when simplicity, affordability, and sufficient accuracy are prioritized'''.

Fangye: /* Results and Data Analysis */

2025-04-08T11:32:15Z

Results and Data Analysis

← Older revision		Revision as of 19:32, 8 April 2025
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	== Results and Data Analysis ==		== Results and Data Analysis ==
	~~<b>~~Results Overview~~</b>~~		===Results Overview===

	<center>		<center>
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	</center>		</center>

	~~<b>~~Calculate~~</b>~~		===Calculate===

	To assess the consistency and performance of the two sensors (SWT Sensor 1 and DHT11 Sensor 2), we calculated the sample variance for each set of measurements across different environments: rainy conditions, indoor room, and canteen. The variance provides a quantitative measure of the spread or variability in sensor readings.		To assess the consistency and performance of the two sensors (SWT Sensor 1 and DHT11 Sensor 2), we calculated the sample variance for each set of measurements across different environments: rainy conditions, indoor room, and canteen. The variance provides a quantitative measure of the spread or variability in sensor readings.
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	~~<b>~~Analysis~~</b>~~		===Analysis and Conclusion===

	~~The objective of this experiment was to compare two temperature and humidity sensors—DHT11 and SHT31-DIS—in real-world conditions, focusing~~ on ~~cost-effectiveness, usability, and basic accuracy under various environments including outdoor, indoor,~~ and ~~rainy conditions.~~		✅ Final Analysis Based on Project Goals and Experimental Results

	~~📌 Strengths~~ of DHT11 ~~(Based~~ on ~~Experimental Evidence)~~		The objective of this project was to compare two temperature and humidity sensors'''DHT11''' and '''SHT31-DIS''' under real-world conditions, focusing on their '''cost-effectiveness''', '''ease of integration''', and '''basic accuracy''' in different environments including outdoor, indoor, and rainy conditions.
	~~Despite its reputation as a low-~~cost ~~and entry~~-~~level sensor~~, ~~the DHT11 performed surprisingly well~~ in ~~our experiments:~~

	~~🔹 Consistent performance: In all tested environments, the~~ DHT11 produced stable readings. While it showed a small variance in temperature and humidity (as expected), the values remained within a reasonable range for general-purpose monitoring. For example, in rainy conditions, the humidity variance was 1.96 %², which is acceptable for many non-critical applications.		✅ Strengths of DHT11

	~~🔹 Low variance in controlled environments: The DHT11 showed particularly good performance indoors~~, ~~where~~ the ~~humidity variance reached 7.14 %² (slightly higher than SHT31), but~~ the ~~temperature variance was only 0.11 °C², not far from SHT31’s 0.03 °C². This demonstrates its capability in stable indoor conditions, where drastic environmental changes are unlikely.~~		Despite being known as a low-cost and entry-level sensor, the DHT11 performed surprisingly well in our experiment and demonstrated the following strengths:

	~~🔹 Sufficient accuracy~~ for non-critical monitoring~~: While the sensor is not meant for precision applications, it is more than adequate for educational, DIY, environmental logging, and smart home systems~~.		* '''Stable and consistent readings''': In all tested environments, the DHT11 provided reasonable and consistent data. For example, in rainy conditions, the humidity variance was only '''1.96 %²''', which is acceptable for many non-critical monitoring tasks.

	~~Very easy to use and integrate~~: ~~The~~ DHT11 ~~uses~~ a ~~single-wire digital signal and~~ is ~~extremely beginner-friendly—ideal for students, hobbyists~~, ~~or rapid prototyping~~.		* '''Good performance in stable indoor conditions''': In the indoor environment, DHT11 showed a temperature variance of only '''0.11 °C²''', compared to SHT31's '''0.03 °C²'''. This shows it is capable of performing well in controlled, less dynamic environments.

	~~Cost-effectiveness~~: ~~One of the most important advantages~~ is ~~that~~ DHT11 ~~can provide reliable data at a very low cost~~, ~~making it a great fit for budget-constrained designs or multi-sensor networks~~.		* '''Sufficient accuracy for general use''': While it is not suitable for precision applications, DHT11 is accurate enough for '''educational projects''', '''DIY environmental monitors''', and '''smart home systems'''.

	~~Comparison~~ with ~~SHT31-DIS~~		* '''Very easy to use and integrate''': The single-wire digital output makes it simple to connect with most microcontrollers, especially for beginners and students.

	~~The~~ SHT31-DIS ~~undoubtedly provides higher~~ accuracy, faster response ~~time~~, and broader ~~operating ranges, especially in rapidly changing outdoor conditions. However~~, our results ~~show~~ that the DHT11 still ~~holds up~~ well in ~~less dynamic environments and offers a remarkably efficient~~ performance-to-cost ratio.		* '''Highly cost-effective''': One of its greatest advantages is the ability to deliver useful data at a '''very low cost''', making it ideal for '''low-budget or large-scale sensor networks'''.

			✅ Comparison with SHT31-DIS

			While the SHT31-DIS clearly offers better '''accuracy''', '''faster response''', and '''broader working range''', our experiment results indicate that the DHT11 still performs well in many practical scenarios, especially when the environmental conditions are stable. Its performance-to-cost ratio is impressive, particularly for general monitoring purposes.

			✅ Conclusion

			Although the SHT31-DIS is a better choice for high-precision or industrial applications, the DHT11 '''fully meets the goals of this project''' — providing a practical, reliable, and affordable solution for basic temperature and humidity monitoring. Based on our experimental data and project objectives, we conclude that '''DHT11 is a highly viable option when simplicity, affordability, and sufficient accuracy are prioritized'''.

	== References ==		== References ==

Fangye: /* Results and Data Analysis */

2025-04-08T11:27:27Z

Results and Data Analysis

← Older revision		Revision as of 19:27, 8 April 2025
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	<b>Analysis</b>		<b>Analysis</b>

			The objective of this experiment was to compare two temperature and humidity sensors—DHT11 and SHT31-DIS—in real-world conditions, focusing on cost-effectiveness, usability, and basic accuracy under various environments including outdoor, indoor, and rainy conditions.

			📌 Strengths of DHT11 (Based on Experimental Evidence)
			Despite its reputation as a low-cost and entry-level sensor, the DHT11 performed surprisingly well in our experiments:

			🔹 Consistent performance: In all tested environments, the DHT11 produced stable readings. While it showed a small variance in temperature and humidity (as expected), the values remained within a reasonable range for general-purpose monitoring. For example, in rainy conditions, the humidity variance was 1.96 %², which is acceptable for many non-critical applications.

			🔹 Low variance in controlled environments: The DHT11 showed particularly good performance indoors, where the humidity variance reached 7.14 %² (slightly higher than SHT31), but the temperature variance was only 0.11 °C², not far from SHT31’s 0.03 °C². This demonstrates its capability in stable indoor conditions, where drastic environmental changes are unlikely.

			🔹 Sufficient accuracy for non-critical monitoring: While the sensor is not meant for precision applications, it is more than adequate for educational, DIY, environmental logging, and smart home systems.

			Very easy to use and integrate: The DHT11 uses a single-wire digital signal and is extremely beginner-friendly—ideal for students, hobbyists, or rapid prototyping.

			Cost-effectiveness: One of the most important advantages is that DHT11 can provide reliable data at a very low cost, making it a great fit for budget-constrained designs or multi-sensor networks.

			Comparison with SHT31-DIS

			The SHT31-DIS undoubtedly provides higher accuracy, faster response time, and broader operating ranges, especially in rapidly changing outdoor conditions. However, our results show that the DHT11 still holds up well in less dynamic environments and offers a remarkably efficient performance-to-cost ratio.

	== References ==		== References ==

Fangye: /* Operation Timing */

2025-04-08T06:41:55Z

Operation Timing

← Older revision		Revision as of 14:41, 8 April 2025
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	==== Operation Timing ====		==== Operation Timing ====

	<center>[[File:【71】Picture 4.jpg\|~~400px~~]]</center>		<center>[[File:【71】Picture 4.jpg\|600px]]</center>
	<center>'''Operation Timing'''</center>		<center>'''Operation Timing'''</center>

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	First, the host pulls the data line low for at least 18 ms, then pulls it high again and waits for 20–40 μs (typically 30 μs). At this point, the initialization signal has been completely sent.		First, the host pulls the data line low for at least 18 ms, then pulls it high again and waits for 20–40 μs (typically 30 μs). At this point, the initialization signal has been completely sent.

	<center>[[File:【71】Picture 5.jpg\|~~400px~~]]</center>		<center>[[File:【71】Picture 5.jpg\|600px]]</center>
	<center>'''Host Sends Initialization Signal'''</center>		<center>'''Host Sends Initialization Signal'''</center>

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	{\| style="margin: auto;"		{\| style="margin: auto;"
	\|-		\|-
	\| <center>[[File:【71】Picture 6.jpg\|~~400px~~]]</center>		\| <center>[[File:【71】Picture 6.jpg\|500px]]</center>
	\| <center>[[File:【71】Picture 7.jpg\|~~400px~~]]</center>		\| <center>[[File:【71】Picture 7.jpg\|500px]]</center>
	\|-		\|-
	\| <center>'''The representation of a logic ‘0’ signal'''</center>		\| <center>'''The representation of a logic ‘0’ signal'''</center>

Fangye: /* Analysis of advantages and disadvantages */

2025-04-08T06:32:30Z

Analysis of advantages and disadvantages

← Older revision		Revision as of 14:32, 8 April 2025
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	• Not suitable for precision measurement or industrial high-accuracy applications		• Not suitable for precision measurement or industrial high-accuracy applications



	*Electronic display		*Electronic display

Fangye: /* Results and Data Analysis */

2025-04-08T06:29:52Z

Results and Data Analysis

← Older revision		Revision as of 14:29, 8 April 2025
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	<b>Results Overview</b>		<b>Results Overview</b>

	{\| style="text-align: center;"		<center>
			{\| style="text-align: center; margin: auto;"
	\|-		\|-
	\| [[File:OutdoorTem.png\|300px~~\|center\|thumb\|Outdoor Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time~~]]		\| <center>[[File:OutdoorTem.png\|300px]]</center>
	\| [[File:OutdoorHum.jpg\|300px~~\|center\|thumb\|Outdoor Humidity Response Recorded by SHT31 and DHT11 Sensors Over Time~~]]		\| <center>[[File:OutdoorHum.jpg\|300px]]</center>
	\| [[File:RainTem.png\|300px~~\|center\|thumb\|RainyDay Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time~~]]		\| <center>[[File:RainTem.png\|300px]]</center>
	\|-		\|-
	\| ~~[[File:RainHum.jpg~~\|~~300px~~\|center~~\|thumb\|~~RainyDay ~~Humidity~~ Response Recorded by SHT31 and DHT11 Sensors Over Time]]		\| <center>'''Outdoor Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
	\| [[File:RoomTem.png\|300px\|center\|~~thumb~~\|Room Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time]]		\| <center>'''Outdoor Humidity Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
	\| ~~[[File:RoomHum.jpg\|300px\|~~center~~\|thumb\|~~Room Humidity Response Recorded by SHT31 and DHT11 Sensors Over Time]]		\| <center>'''RainyDay Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
			\|-
			\| <center>[[File:RainHum.jpg\|300px]]</center>
			\| <center>[[File:RoomTem.png\|300px]]</center>
			\| <center>[[File:RoomHum.jpg\|300px]]</center>
			\|-
			\| <center>'''RainyDay Humidity Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
			\| <center>'''Room Temperature Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
			\| <center>'''Room Humidity Response Recorded by SHT31 and DHT11 Sensors Over Time'''</center>
	\|}		\|}
			</center>

	<b>Calculate</b>		<b>Calculate</b>
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	Based on the calculation, the result is：		Based on the calculation, the result is：
	<center>[[File:variance.png\|~~600px~~]]</center>		<center>[[File:variance.png\|750px]]</center>
	<center>'''Variance of Temperature and Humidity Sensor Readings Across Three Environments'''</center>		<center>'''Variance of Temperature and Humidity Sensor Readings Across Three Environments'''</center>

Fangye: /* Experiment Operation */

2025-04-08T06:28:53Z

Experiment Operation

← Older revision		Revision as of 14:28, 8 April 2025
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	Observe Temperature and Humidity Data on the Serial Monitor and record the data.		Observe Temperature and Humidity Data on the Serial Monitor and record the data.

	[[File:Experimental-Procedure.jpg\|center~~\|thumb\|~~Experimental Procedure]]		<center>[[File:Experimental-Procedure.jpg\|400px]]</center>
			<center>'''Experimental Procedure'''</center>

	== Results and Data Analysis ==		== Results and Data Analysis ==

Fangye: /* B57861S-SHT31 Connection */

2025-04-08T06:28:25Z

B57861S-SHT31 Connection

← Older revision		Revision as of 14:28, 8 April 2025
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	{\| style="margin: auto;"		{\| style="margin: auto;"
	\|-		\|-
	\| <center>[[File:Dht11-arduino.jpg\|~~200px~~]]</center>		\| <center>[[File:Dht11-arduino.jpg\|250px]]</center>
	\| <center>[[File:B57861S-SHT31.jpg\|~~200px~~]]</center>		\| <center>[[File:B57861S-SHT31.jpg\|250px]]</center>
	\|-		\|-
	\| <center>'''DHT11 Sensor Connected to Arduino UNO'''</center>		\| <center>'''DHT11 Sensor Connected to Arduino UNO    '''</center>
	\| <center>''' NTC thermistor B57861S and ~~the~~ SHT31 temperature and humidity sensor'''</center>		\| <center>'''NTC thermistor B57861S and SHT31 temperature and humidity sensor'''</center>
	\|}		\|}
	</center>		</center>

Fangye: /* B57861S-SHT31 Connection */

2025-04-08T06:23:41Z

B57861S-SHT31 Connection

← Older revision		Revision as of 14:23, 8 April 2025
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	\|-		\|-
	\| <center>'''DHT11 Sensor Connected to Arduino UNO'''</center>		\| <center>'''DHT11 Sensor Connected to Arduino UNO'''</center>
	\| <center>'''NTC thermistor B57861S and the SHT31 temperature and humidity sensor'''</center>		\| <center>''' NTC thermistor B57861S and the SHT31 temperature and humidity sensor'''</center>
	\|}		\|}
	</center>		</center>

Fangye: /* B57861S-SHT31 Connection */

2025-04-08T06:23:17Z

B57861S-SHT31 Connection

← Older revision		Revision as of 14:23, 8 April 2025
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	{\| style="margin: auto;"		{\| style="margin: auto;"
	\|-		\|-
	\| <center>[[File:Dht11-arduino.jpg\|~~300px~~]]</center>		\| <center>[[File:Dht11-arduino.jpg\|200px]]</center>
	\| <center>[[File:B57861S-SHT31.jpg\|~~300px~~]]</center>		\| <center>[[File:B57861S-SHT31.jpg\|200px]]</center>
	\|-		\|-
	\| <center>'''DHT11 Sensor Connected to Arduino UNO'''</center>		\| <center>'''DHT11 Sensor Connected to Arduino UNO'''</center>