Numbers represent the columns which are connected with each others. And inner part of it, there are letters and numbers. You can figure out this via looking at the red and blue lines on the breadboard. Some kind of breadboards have positive or negative line through the board, on the other hand the other types’ power and ground lines might be diveded in two. Before we start you should refill your cups it might be a little long. So, below I will explain my little challange step by step.
When i start to research I don’t have any knowledge about how to set up a circuit or how can i embed a code in a microcontroller unit and many similar question. Some of the sensors which can be used as an alternative to DHT11 sensor are DHT22, AM2302, SHT71.A couple of weeks ago i wanted to set up a simple circuit, which is going to measure humidity and temperature level in air. It’s compact size and sampling rate made this sensor popular among hobbyists. Offices, cars, museums, greenhouses and industries use this sensor for measuring humidity values and as a safety measure. The humidity sensor is used as a preventive measure in homes where people are affected by humidity. Weather stations also use these sensors to predict weather conditions. This sensor is used in various applications such as measuring humidity and temperature values in heating, ventilation and air conditioning systems. A pull-up resistor of 5k to 10k ohms is provided for communication between sensor and micro-controller. DHT11 SensorĭHT11 sensor has four pins- VCC, GND, Data Pin and a not connected pin. The maximum current used while measuring is 2.5mA. DHT11 is small in size with operating voltage from 3 to 5 volts. Humidity range of this sensor is from 20 to 80% with 5% accuracy. The temperature range of DHT11 is from 0 to 50 degree Celsius with a 2-degree accuracy. To get larger resistance value even for the smallest change in temperature, this sensor is usually made up of semiconductor ceramics or polymers. The IC measure, process this changed resistance values and change them into digital form.įor measuring temperature this sensor uses a Negative Temperature coefficient thermistor, which causes a decrease in its resistance value with increase in temperature. Change in the capacitance value occurs with the change in humidity levels.
The humidity sensing capacitor has two electrodes with a moisture holding substrate as a dielectric between them.
DHT11 sensor consists of a capacitive humidity sensing element and a thermistor for sensing temperature.
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