DHT11 vs DHT20 vs DHT21 vs DHT22 vs SHT30 vs SHT41 vs SHT45 vs DS18B20 vs LM35
For a quick comparison of the sensors, we’ve put together the following table that shows the most important information when it comes to select a temperature sensor namely: communication protocol, supply voltage, temperature range and accuracy.
| Measures | Communication protocol |
Supply Voltage |
Temperature range |
Temperature accuracy(Typical) |
Humidity accuracy(Typical) |
||
| DHT11 |  |
Temperature & Humidity |
One-wire | 3.3 to 5.5V | 0 to 50ºC | ±2 ºC at 0-50 °C | ±?? RH |
| DHT20 (AHT20) |  |
Temperature & Humidity |
I²C | 2.2 to 5.5V | -40 to 80ºC | ±0.3 ºC at 20-60 °C ±0.5 ºC at -40-80 °C |
±2% at 20-80% RH ±3% at 0-100% RH |
| DHT21 (AM2301) |  |
Temperature & Humidity |
One-wire | 3.3 to 5.2V | -40 to 80ºC | ±0.3 ºC at 20-60 °C ±0.5 ºC at -40-80 °C |
±2% at 30-80% RH ±3.5% at 0-100% RH |
| DHT22 (AM2302) |  |
Temperature & Humidity |
One-wire | 3.3 to 6V | -40 to 80ºC | ±0.5 ºC at -40-80 °C |
±2% to ±5% RH |
| SHT30 |
Temperature & Humidity |
Analog | 3.3 to 5.5V | -40 to 125ºC | ±0.2°C at 10~55°C (typical) ±1.5°C at -40°C~125°C (typical) Resolution: 0.01°C, 14bit |
±3 % @ 10~90 %RH (typical) ±8 % @ 0~100 %RH (typical) Resolution: 0.006 %, 14bit |
|
| SHT41 |
Temperature & Humidity |
I²C | 1.08 to 3.6V | -40 to 125ºC | ±0.2 ºC | ±1.8 RH | |
| SHT45 |
Temperature & Humidity |
I²C | 1.08 to 3.6V | -40 to 125ºC | ±0.1 ºC | ±1.5 RH | |
| LM35 | Temperature | Analog | 4 to 30V | -55 to 150ºC | ±0.5 ºC at 25 ºC | N.A. | |
| DS18B20 | Temperature | One-wire | 3 to 5.5V | -55 to 125ºC | ±0.5 ºC at -10-85 °C | N.A. |