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Table of Contents
Summary of Contents for aosong DHT11
- Page 1 Temperature and humidity module DHT11 Product Manual www.aosong.com...
- Page 2 1、Product Overview 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.
- Page 3 Sampling period: more than 2 seconds Pin Description 1, the VDD power supply 3.5～5.5V DC 2 DATA serial data, a single bus 3, NC, empty pin 4, GND ground, the negative power Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 2 -...
- Page 4 7、Serial communication instructions (single-wire bi-directional) ◎Single 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;...
- Page 5 User host (MCU) to send a signal, DHT11 converted from low-power mode to high-speed mode, until the host began to signal the end of the DHT11 send a response signal to send 40bit data, and trigger a letter collection. The signal is sent as shown.
- Page 6 80 micro-seconds of high notification peripheral is ready to receive data, the microprocessor I / O at this time in the input state is detected the I / O low (DHT11 response signal), wait 80 microseconds highdata receiving and sending signals as shown: Step 4: Output by DHT11 the DATA pin 40, the microprocessor receives 40 data bits of data "0"...
- Page 7 End signal: Continue to output the low 50 microseconds after DHT11 the DATA pin output 40 data, and changed the input state, along with pull-up resistor goes high. But DHT11 internal re-test environmental temperature and humidity data, and record the data, waiting for the arrival of the external signal.
- Page 8 Manual welding, in the maximum temperature of 300℃ under the conditions of contact time shall be less than 3 seconds. 8. Product upgrades Details, please the consultation Aosong electronics department. 9、The license agreement Without the prior written permission of the copyright holder, shall not in any form or by any means, electronic or mechanical (including photocopying), copy any part of this manual, nor shall its contents be communicated to a third party.
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