![]() ![]() Use the same connections on an Arduino MEGA 2560. The following circuit diagram shows how to connect a DHT11 sensor to an Arduino Uno. Arduino DHT11 Sensor Tutorial Circuit Diagram The section after the circuit diagram that follows explains how to install a DHT11 sensor library. In order to use the DHT11 sensor in an Arduino sketch, a DHT11 library is loaded in the Arduino IDE. This is different from the MCP9700 temperature sensor that outputs an analog voltage that represents temperature. That is, it sends serial digital data out on the pin, rather than outputting an analog value. This sensor clocks temperature and humidity data out of the DATA pin. Power the DHT11 sensor with 5V from the Arduino, as explained in the next section. DHT11 Temperature and Humidity Sensor Pinout This allows the sensor to measure the current air temperature and relative humidity. Because of the holes, air passes onto the sensor surface. As can be seen in the image, the sensor has a blue plastic case with square holes. ![]() This is not recommended because you bypass the LD1117S50CTR 5V voltage regulator and have to make sure that the voltage level is stable.The following image shows the DHT11 sensor pin numbering or pinout. You can also power power the Arduino microcontroller from the 5V pin. You cannot power the board with the barrel jack and VIN GPIO at the same time, because there is a polarity protection diode, connecting between the positive of the barrel jack to the VIN pin, rated at 1A. Therefore you are able to power the Uno with an external 9 Volt battery. The voltage has to be between 7V and 12V. VIN Pin: If you use an external power supply like a battery, you can use the VIN pin.If you buy a DC power jack, make sure the power adapter of the plug supplies a voltage between 7V and 12V. DC Power Jack: It is possible to use the DC power Jack as power supply.The standard USB connection delivers 5V and allows you to draw 500mA in total. USB cable: The most popular and also the easiest way to power the microcontroller is via USB cable.Like the Arduino Uno, you can power your Arduino Mega in three save ways because a voltage regulator provides a regulated and stable voltage for the ATmega2560 microprocessor: In my opinion you should be save to draw a current up to 100mA. The LP2985-33DBVR has a maximum output current of 150mA but on the official Arduino website, the maximum current is limited to 50mA. The maximum current draw from the USB connection is therefore reduced to 500mA.īecause the Arduino Mega has 3.3V pins to supply external electrical devices, there is a second voltage regulator build in, that reduces the voltage from 5V to 3.3V. There is no need for a voltage regulator because the USB connection is already regulated by the USB output from your PC or laptop. The Arduino Mega can also be powered via the USB port. The maximum output current of the LD1117S50CTR is 800mA. Besides a higher input voltage than 12V has no advantage. But an input voltage between 7V and 12V is recommended to use the Arduino Mega over an extended period of time because otherwise the voltage regulator produces a lot of heat that can damage the microcontroller. The LD1117S50CTR provides a stable 5V output for the ATmega2560 and has a maximum input voltage of 15V. ![]()
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