386 386 Datasheet

Part	Datasheet
386	386 (pdf)

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DHT11 digital temperature and humidity sensor is a composite Sensor contains a calibrated digital signal output of the temperature and humidity. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has high reliability and excellent long-term stability. The sensor includes a resistive sense of wet components and an NTC temperature measurement devices, and connected with a high-performance 8-bit microcontroller. HVAC, dehumidifier, testing and inspection equipment, consumer goods, automotive, automatic control, data loggers, weather stations, home appliances, humidity regulator, medical and other humidity measurement and control. Low cost, long-term stability, relative humidity and temperature measurement, excellent quality, fast response, strong anti-interference ability, long distance signal transmission, digital signal output, and precise calibration. unit mm Aosong Guangzhou Electronics Co.,Ltd. / 36380552 -1- parameters Relative humidity Resolution 16Bit Repeatability ±1% RH Accuracy At 25℃ ±5% RH Interchangeability fully interchangeable Response time 1 / e 63% of 25℃ 6s 1m / s air 6s Hysteresis <± RH Long-term stability <± RH / yr in Temperature Resolution 16Bit Repeatability Range At 25℃ ±2℃ Response time 1 / e 63% 10S Electrical Characteristics Power supply DC Supply Current measurement 0.3mA standby 60u A Sampling period more than 2 seconds Pin Description 1, the VDD power supply DC 2 DATA serial data, a single bus 3, NC, empty pin 4, GND ground, the negative power Aosong Guangzhou Electronics Co.,Ltd. / 36380552 -2- circuit Microprocessor and DHT11 of connection typical application circuit as shown above, DATA pull the microprocessor I / O ports are connected. Typical application circuit recommended in the short cable length of 20 meters on the 5.1K pull-up resistor, the resistance of greater than 20 meters under the pull-up resistor on the lower of the actual situation. When using a 3.5V voltage supply cable length shall not be greater than 20cm. Otherwise, the line voltage drop will cause the sensor power supply shortage, caused by measurement error. Each read out the temperature and humidity values are the results of the last measurement For real-time data, sequential read twice, but is not recommended to repeatedly read the sensors, each read sensor interval is greater than 5 seconds can be obtainedaccurate data. communication instructions single-wire bi-directional bus Description DHT11 uses a simplified single-bus communication. Single bus that only one data line, the system of data exchange, control by a single bus to complete. Device master or slave through an open-drain or tri-state port connected to the data line to allow the device does not send data to release the bus, while other devices use the bus single bus usually require an external one about 5.1kΩ pull-up resistor, so that when the bus is idle, its status is high. Because they are the master-slave structure, and only when the host calls the slave, the slave can answer, the host access devices must strictly follow the single-bus sequence, if the chaotic sequence, the device will not respond to the host. bus to transfer data defined DATA For communication and synchronization between the microprocessor and DHT11, single-bus data format, a transmission of 40 data, the high first-out. Aosong Guangzhou Electronics Co.,Ltd. / 36380552 -3- Data format The 8bit humidity integer data + 8bit the Humidity decimal data +8 bit temperature integer data + 8bit fractional temperature data +8 bit parity bit. bit data definition “8bit humidity integer data + 8bit humidity decimal data +8 bit temperature integer data + 8bit temperature fractional data” 8bit checksum is equal to the results of the last eight. Example 1 40 data is received: 0011 0101 0000 0001 1000 0000 0100 1101 0011 0101+0000+0001 1000+0000= 0100 1101 Received data is 0101=35H=53%RH 1000=18H=24℃ Example 2 40 data is received: 0011 0101 0000 0001 1000 0000 0100 1001 0011 0101+0000+0001 1000+0000＝ 0100 1101 1001 The received data is not correct, give up, to re-receive data.

PDF Datasheet Preview

DHT11 digital temperature and humidity sensor is a composite Sensor contains a calibrated digital signal output of the temperature and humidity. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has high reliability and excellent long-term stability. The sensor includes a resistive sense of wet components and an NTC temperature measurement devices, and connected with a high-performance 8-bit microcontroller.

HVAC, dehumidifier, testing and inspection equipment, consumer goods, automotive, automatic control, data loggers, weather stations, home appliances, humidity regulator, medical and other humidity measurement and control.

Low cost, long-term stability, relative humidity and temperature measurement, excellent quality, fast response, strong anti-interference ability, long distance signal transmission, digital signal output, and precise calibration.
unit mm

Aosong Guangzhou Electronics Co.,Ltd.
/ 36380552 -1-
parameters

Relative humidity Resolution 16Bit Repeatability ±1% RH Accuracy At 25℃ ±5% RH Interchangeability fully interchangeable Response time 1 / e 63% of 25℃ 6s 1m / s air 6s Hysteresis <± RH Long-term stability <± RH / yr in

Temperature Resolution 16Bit Repeatability Range At 25℃ ±2℃ Response time 1 / e 63% 10S

Electrical Characteristics Power supply DC Supply Current measurement 0.3mA standby 60u A Sampling period more than 2 seconds

Pin Description 1, the VDD power supply DC 2 DATA serial data, a single bus 3, NC, empty pin 4, GND ground, the negative power

Aosong Guangzhou Electronics Co.,Ltd.
/ 36380552 -2-
circuit

Microprocessor and DHT11 of connection typical application circuit as shown above, DATA pull the microprocessor I / O ports are connected.

Typical application circuit recommended in the short cable length of 20 meters on the 5.1K pull-up resistor, the resistance of greater than 20 meters under the pull-up resistor on the lower of the actual situation.

When using a 3.5V voltage supply cable length shall not be greater than 20cm. Otherwise, the line voltage drop will cause the sensor power supply shortage, caused by measurement error.

Each read out the temperature and humidity values are the results of the last measurement For real-time data, sequential read twice, but is not recommended to repeatedly read the sensors, each read sensor interval is greater than 5 seconds can be obtainedaccurate data.
communication instructions single-wire bi-directional bus Description

DHT11 uses a simplified single-bus communication. Single bus that only one data line, the system of data exchange, control by a single bus to complete. Device master or slave through an open-drain or tri-state port connected to the data line to allow the device does not send data to release the bus, while other devices use the bus single bus usually require an external one about 5.1kΩ pull-up resistor, so that when the bus is idle, its status is high. Because they are the master-slave structure, and only when the host calls the slave, the slave can answer, the host access devices must strictly follow the single-bus sequence, if the chaotic sequence, the device will not respond to the host.
bus to transfer data defined DATA For communication and synchronization between the microprocessor and DHT11, single-bus
data format, a transmission of 40 data, the high first-out.

Aosong Guangzhou Electronics Co.,Ltd.
/ 36380552 -3-

Data format The 8bit humidity integer data + 8bit the Humidity decimal data +8 bit temperature integer data +
8bit fractional temperature data +8 bit parity bit.
bit data definition “8bit humidity integer data + 8bit humidity decimal data +8 bit temperature integer data + 8bit
temperature fractional data” 8bit checksum is equal to the results of the last eight.

Example 1 40 data is received:
0011 0101
0000
0001 1000
0000 0100 1101
0011 0101+0000+0001 1000+0000= 0100 1101 Received data is 0101=35H=53%RH 1000=18H=24℃

Example 2 40 data is received:
0011 0101
0000
0001 1000
0000
0100 1001
0011 0101+0000+0001 1000+0000＝ 0100 1101 1001 The received data is not correct, give up, to re-receive data.

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386

386 Datasheet

Datasheet ID: 386 515369