Sensors: Difference between revisions

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Created page with "This is a list of sensors and their related information. === MH-Z19 CO2 Sensor === These CO2 modules cost about $17 USD. They come in 3 models: 0-2000PPM, 0-5000PPM, and 0-10..."
 
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This is a list of sensors and their related information.
This is a list of sensors and their related information.


=== MH-Z19 CO2 Sensor ===
===MH-Z19 CO2 Sensor===
These CO2 modules cost about $17 USD. They come in 3 models: 0-2000PPM, 0-5000PPM, and 0-10000PPM.
These CO2 modules cost about $17 USD. They come in 3 models: 0-2000PPM, 0-5000PPM, and 0-10000PPM.


Interface: PWM or UART
Interface: PWM or UART


=== CCS811 CO2 Sensor ===
===CCS811 Air Quality Sensor===
MQ135 Air Quality Sensor
The CCS811 air quality sensor can measure Volatile Organic Compounds (VOCs). These cost about $8 USD.
{| class="wikitable"
|'''Pin Number'''
|'''Pin Name'''
|'''Description'''
|-
|1
|VCC
|Power supply for the module can typically 3.3V is  used
|-
|2
|GND
|Ground of the module, connected to ground of the  circuit
|-
|3
|SCL
|Serial Clock Line, used to provide clock pulse  for I2C communication
|-
|4
|SDA
|Serial Data Address, used to transfer the data  through I2C communication
|-
|5
|WAK
|Wake (active low)
|-
|6
|INT
|Interrupt (active low)
|-
|7
|RST
|Reset (active low)
|-
|8
|ADD
|Single address select bit to allow alternate  address to be selected
|}
 
=== MQ135 Air Quality Sensor ===


=== DHT 11, DHT22 ===
===DHT 11, DHT22===
The DHT11 is a digital temperature and humidity sensor. They are notable by their blue perforated plastic package. The DHT11 is created by Aosong Guangzhou Electronics Co. Ltd. Each unit costs around $1.5 USD.
The DHT11 is a digital temperature and humidity sensor. They are notable by their blue perforated plastic package. The DHT11 is created by Aosong Guangzhou Electronics Co. Ltd. Each unit costs around $1.5 USD.


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|}
|}


=== BMP085, BMP180, BMP280 ===
===BMP085, BMP180, BMP280===
These BMPs are atmospheric pressure sensors. They use I2C or SPI.  The BMP280 appears to have superseded and are readily available on Ebay for around $0.50 and $1 USD each.
These BMPs are atmospheric pressure sensors. They use I2C or SPI.  The BMP280 appears to have superseded and are readily available on Ebay for around $0.50 and $1 USD each.


=== MAX30102 ===
===MAX30102===
The MAX30102 is a heart rate monitor and pulse oximeter biosensor. These modules cost about $2 USD on AliExpress.
The MAX30102 is a heart rate monitor and pulse oximeter biosensor. These modules cost about $2 USD on AliExpress.


=== HC-SR501 Infrared Motion Sensor ===
===HC-SR501 Infrared Motion Sensor===
The SR501 is an infrared motion sensor. They cost around $1.5 USD each. It has 2 potentiometers that are used to adjust the detection sensitivity and duration of the signal. The middle output pin gives a 3.3V signal when motion is detected and resets back to ground after a period of time.
The SR501 is an infrared motion sensor. They cost around $1.5 USD each. It has 2 potentiometers that are used to adjust the detection sensitivity and duration of the signal. The middle output pin gives a 3.3V signal when motion is detected and resets back to ground after a period of time.

Revision as of 22:20, 26 July 2020

This is a list of sensors and their related information.

MH-Z19 CO2 Sensor

These CO2 modules cost about $17 USD. They come in 3 models: 0-2000PPM, 0-5000PPM, and 0-10000PPM.

Interface: PWM or UART

CCS811 Air Quality Sensor

The CCS811 air quality sensor can measure Volatile Organic Compounds (VOCs). These cost about $8 USD.

Pin Number Pin Name Description
1 VCC Power supply for the module can typically 3.3V is used
2 GND Ground of the module, connected to ground of the circuit
3 SCL Serial Clock Line, used to provide clock pulse for I2C communication
4 SDA Serial Data Address, used to transfer the data through I2C communication
5 WAK Wake (active low)
6 INT Interrupt (active low)
7 RST Reset (active low)
8 ADD Single address select bit to allow alternate address to be selected

MQ135 Air Quality Sensor

DHT 11, DHT22

The DHT11 is a digital temperature and humidity sensor. They are notable by their blue perforated plastic package. The DHT11 is created by Aosong Guangzhou Electronics Co. Ltd. Each unit costs around $1.5 USD.

The DHT22, also called AM2302, RHT03, is similar to the DHT11 but offers a slightly wider operating temperature range and higher temperature and humidity resolution. The DHT22 is slightly more expensive at around $3 USD per unit.

The difference between the two modules are outlined in the table below.

DHT11 DHT22
Relative Humidity Operating Range 20 ~ 90% 0 ~ 100%
Relative Humidity Accuracy ±5%RH ±2%RH (Max ±5%RH)
Humidity Resolution 1%RH 0.1%RH
Humidity Repeatability ±1%RH ±1%RH
Humidity Hysteresis ±1%RH ±0.3%RH
Long-term Stability ±1%RH/year ±0.5%RH/year
Temperature Operating Range 0 ~ 50°C -40 ~ 80°C
Temperature Accuracy ±2°C ±0.5°C
Temperature Resolution 1°C 0.1°C

BMP085, BMP180, BMP280

These BMPs are atmospheric pressure sensors. They use I2C or SPI. The BMP280 appears to have superseded and are readily available on Ebay for around $0.50 and $1 USD each.

MAX30102

The MAX30102 is a heart rate monitor and pulse oximeter biosensor. These modules cost about $2 USD on AliExpress.

HC-SR501 Infrared Motion Sensor

The SR501 is an infrared motion sensor. They cost around $1.5 USD each. It has 2 potentiometers that are used to adjust the detection sensitivity and duration of the signal. The middle output pin gives a 3.3V signal when motion is detected and resets back to ground after a period of time.