This Breadboard power supply takes power from a 6 to 15V DC power supply and outputs a selectable 5V or 3.3V regulated voltage using a switch. This board can be easily inserted into a breadboard using a .1" (2.54 mm) headers mounted on the bottom of the PCB.
The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed).
The DS1307 is a low power serial real time clock/calendar from Maxim Integrated with full binary coded decimal (BCD) clock/calendar plus 56 bytes of Non Volatile Static Random Access Memory.The DS1307 allows a microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. It can be used in data-logging projects, clock, timers and alarms.
The DS18B20+ 1-Wire Digital Thermometer & Thermostat provides 9 to 12-bit (configurable) temperature readings over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor.