Temperature humidity sensors comparison (Specifications) Part 1

Specs and configuration

Wherever I go, I’m asked why I chose DHT12, and why I came to write the library for this small sensor, today I’ll try to give an answer.

Sensors

Here the specification of sensor tested

BMP280

Temperature pressure sensor

You can find here AliExpress

Specs

• Low cost
• 1.71 to 3.6V power and I/O
• 2.74μA typical current, 0.1 μA in sleep mode
• Good for 300 to 1100 hPa (equiv. to +9000…-500 m above/below sea level) ±0.12 hPa, equiv. to ±1 m
• Good for -40-85°C temperature readings ±2°C accuracy
• Average measurement time 5.5 msec
• Temperature precision: 2 decimal
• Digital interfaces: I²C (up to 3.4 MHz) SPI (3 and 4 wire, up to 10 MHz)

DHT11

Temperature humidity sensor

You can find here AliExpress

• Ultra low cost
• 3 to 5V power and I/O
• 2.5mA max current use during conversion (while requesting data)
• Good for 20-80% humidity readings with 5% accuracy
• Good for 0-50°C temperature readings ±2°C accuracy
• No more than 1 Hz sampling rate (once every second)
• Body size 15.5mm x 12mm x 5.5mm
• Temperature precision: 2 decimal
• 4 pins with 0.1″ spacing
• Unique 1-Wire® Interface Requires Only One Port Pin for Communication

DHT22

Temperature humidity sensor

You can find here AliExpress

• Low cost
• 3 to 5V power and I/O
• 2.5mA max current use during conversion (while requesting data)
• Good for 0-100% humidity readings with 2-5% accuracy
• Good for -40 to 80°C temperature readings ±0.5°C accuracy
• No more than 0.5 Hz sampling rate (once every 2 seconds)
• Body size 15.1mm x 25mm x 7.7mm
• Temperature precision: 1 decimal
• 4 pins with 0.1″ spacing
• Unique 1-Wire® Interface Requires Only One Port Pin for Communication

DHT12

Temperature humidity sensor

You can find here DHT12 AliExpress

• Ultra low cost
• 2.7 to 5.5v power and I/O.
• Operational Current: 1mA. Standby Current: 60µA.
• Good for 20-95% humidity readings with 5% accuracy
• Good for -20 to 60°C temperature readings ±0.5°C accuracy
• 1 Hz sampling rate (once every second)
• Body size 7mm x 12mm x 5.5mm (W x L x H)
• Temperature precision: 2 decimal
• 4 pins with 0.1″ spacing (VDD SDA GND SCL)
• Unique 1-Wire® Interface Requires Only One Port Pin for Communication or I2C
• 4 Pinouts VDD SDA GND SCL.

Dallas Temperature ds18b20

Programmable precision temperature sensor

You can find here AliExpress

• Low cost
• Waterproof version
• Operating voltage: 3.0V a 5.5V
• Operational Current: 1-1.5mA. Standby Current: 750-1000µA.
• Good for -10 to 85°C temperature readings ±0.5°C accuracy
• 1 Hz sampling rate (less than 750ms)
• Temperature precision: 0-2 decimal
• Unique 1-Wire® Interface Requires Only One Port Pin for Communication

Thermistor

Temperature analog sensor (MF58-103 3950 B)

You can find here NTC MF58 3950 B 5% 1% 5K 10K 20K 50K 100K

• Pratically 0 costs
• Operating voltage n.d., It’s a resistence.
• Good for -45 ~+250 (this type of thermistor have quite big range about ±0.5°C accuracy
• Operating current: (<50mW) at 5v 25µA
• Analog read It’s immediately
• Temperature precision depends on analog sampling rate.
• Unique analog wire.

Thanks

In the next part I show the library and how to use the sensors in the Arduino IDE.

1. Temperature humidity sensors comparison (Specifications)
2. Temperature humidity sensors comparison (Code configuration)
3. Temperature humidity sensors comparison (Data)