This project reads the temp in the room and displays three different scenarios where the room is either normal temp, heating up/cooling down, or it's too hot. To do this you need:
1 X DHT11 temp and humidity module
1 X buzzer( I used an active buzzer)
3 X different color led lights
1 X LCD screen
27 X wire jumpers
3 X 220 ohm resistors
1 X potentiometer to control the brightness of the LCD screen.
Step 1: Step 1: Add LCD Screen an Potentiometer
Connect the LCD directly to the breadboard and connect a wire jumper to each pin as pictured. The order goes.
Potentiometer (Connect to power and ground)
Note that there are 4 empty pins that we do not need to connect in the middle.
Step 2: Step 2: Add a Temp Sensor
Attach the temp sensor directly to the breadboard and the pins go in this order.
Power (+5v) rail
Step 3: Step 3: Add a Buzzer and Three LED Lights
Attach an active buzzer and three led pins directly to the breadboard
Connect a jumper wire from the longer leg of the buzzer to Pin 4
Connect another jumper to the smaller leg of the buzzer to GND rail.
Connect resistors to the bent(anode) part of the led lights and attach a wire jumper in the same column as the resistors to connect to pins 5 (for the red led), 6 (for the green led), and 7 (for the blue led).
Connect a jumper wire to the straight part of the led lights to the GND rail.
Credit: Math for temp sensor