(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...")
Revision as of 15:24, 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 CO2 Sensor
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.
|Relative Humidity Operating Range||20 ~ 90%||0 ~ 100%|
|Relative Humidity Accuracy||±5%RH||±2%RH (Max ±5%RH)|
|Temperature Operating Range||0 ~ 50°C||-40 ~ 80°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 The BMP280 appears to have superseded and are readily available on Ebay for around $0.50 and $1 USD each.
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.