In this blog there are some topics talking about the DHT11 relative humidity and temperature sensor and how to interface it with different types of PIC microcontrollers. The datasheet of the DHT11 sensor shows its characteristics and how it works.
Also the following topic shows the DHT11 timing and how to simulate it using Proteus:
Interfacing PIC16F877A with DHT11 (RHT01) sensor Proteus simulation
This topic shows how to interface this sensor with the microcontroller PIC12F1822. This microcontroller has only 8 pins and 6 of them can work as an I/O pins.
An LCD is used to display temperature and relative humidity values. A shift register is used to make a 3-wire LCD as shown at the following link;
Interfacing PIC12F1822 microcontroller with LCD display
Therefor for this simple project we need 3 data lines for the LCD and 1 line for the DHT11 sensor which means we need 4 I/O pins.
Components List:
- PIC12F1822 Microcontroller
- DHT11 (RHT01) Sensor
- 1602 LCD
- 74HC595 Shift Register (74HC164 or CD4094 can do the job)
- 10K Variable Resistor
- 4.7K Resistor
- +5V Power Supply
- Breadboard
- Jumper Wires
Interfacing PIC12F1822 with DHT11 sensor circuit:
The shift register data line is connected to RA0 pin and the clock line is connected to RA1 pin. LCDs enable pin is connected to pin RA3.
The internal oscillator of the PIC12F1822 microcontroller is used.
To see how to use 74HC164 or CD4094 instead of 74HC595 go to the link above.
The DHT11 sensor has 4 pins:
VCC : Positive power supply (+5V)
DATA : Sensor data input and output
NC : Not connected terminal
GND : Ground (0V)
A pull-up resistor must be added between the DHT11 data pin and VCC (+5V) pin as shown in the circuit schematic (4.7K ~ 10K).
Read more: DHT11 Interfacing with PIC12F1822 microcontroller
Related projects
PIC16F877 Driving LCD in 4-Bit Mode using PIC16F877 with Proteus Simulation
Introduction This microcontroller project shows how a PIC16F877 can drive an LCD display using 4-bit mode inside a Proteus simulation.The project demonstrates...
Programmers & ICSP · PIC16F877AEPE PIC/LCD Demo using PIC16F877 with Proteus Simulation
IntroductionThe EPE PIC/LCD Demo is a classic microcontroller project that demonstrates how a PIC16F877 can fully control a PG12864F graphical LCD.Designed as...
Motors & Robotics · PIC16F877AEfficient Sun-Following Robot: A Solar Tracker with Microcontroller Control
Abstract The impending global challenge of dwindling non-renewable fuel resources underscores the urgency of transitioning towards renewable energy alternatives like solar power....
Sensors & TemperatureSpectrum Analyzer using TMS320F28023DA with Proteus Simulation
Introduction This project demonstrates a real-time audio spectrum analyzer using the TMS320F28023DA Piccolo microcontroller, simulated in Proteus VSM. The system captures an...
Sensors & TemperatureDHT22 Low Cost Humidity Sensor using PIC18F25K20 with Proteus Simulation
IntroductionThis microcontroller project demonstrates how to interface a DHT22 (RHT03) digital temperature and humidity sensor with a PIC18F25K20 using Proteus simulation.The project...
Sensors & TemperatureCrafting a Microcontroller-Based Temperature Monitoring System
Abstract As technological advancements progress, processes become increasingly intricate, demanding a corresponding expansion in the parameters necessary for efficient analysis. Data acquisition,...
Ibrar Ayyub
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...