Raspberry from scratch

Hi, this project aim to use DHT11 sensor to check every hour temperature and humidity and send it through email. This is DHT11: you can buy it on amazon ( click here ). what we need?: DHT11 sensor some cables a resistor between 4.7K and 10K ok, place dht11 on breadboard, then follow this connection: breadboard negative rail -> GND pin on Raspberry GPIO breadboard positive rail -> 3.3V pin on Raspberry GPIO pin 4 of DHT11 -> breadboard negative rail pin 3 of DHT11 is not connected pin 2 of DHT11 -> Raspberry GPIO25 pin 1 of DHT11 -> breadboard positive rail place resistor on rail with pin 2 of DHT11 and positive rail this schema explains better: then we need to download ADAFRUIT python library to use DHT11: if you use git: git clone https://github.com/adafruit/Adafruit_Python_DHT.git then enter in folder and from terminal write: sudo python setup.py install Ok this code is based on adafruit example but i ...

LED bicolor Red Green

Hi, it's saturday evening... you 're probably around drinking beer or to make love but i must do a study case for a stupid exam for my university... nice... it's time to my Raspberry Pi and my dream of ruling the world. This time what i want to do is to switch a bicolor LED from red to green This is a bicolor LED: A bicolor LED has three pins.. Two anode for red color and green color and a cathode. Remember that cathode is the longest, green is the second longest pin and red is the shortest pin. What i need: one bicolor LED three resistor of 330 ohm one beer something that entice me to study this connection is pretty simple: put bicolor LED on breadboard. Connect ground on RaspberryPi to blue track ob breadboard. Use one 330 ohm resistor to connect the cathode pin to blue track on breadboard. Connect pin 18 on Raspberry to green LED pin (and place a 330 ohm resistor in the middle) then connect pin 24 on Raspberry to red LED pin (and place a r...

Buzzer

ok, few days ago i bougth from amazon a sunfounder kit with a lot of diy ( this one ). This kit has a lot of things: a breadboard bigger, a DC motor, an LCD, some LEDs and other things that i don't know what they do... One of this things is a Buzzer... since no one asks me i write it anyway. A buzzer is an audio signaling device (thanks wikipedia ). This is the buzzer: the buzzer has 2 pins one more longer (positive pin) the the other (the negative pin) What i want to do is let the buzzer play sound. what i need? an active buzzer some wires a transistor pnp one resistor i know nothing about electronic and so looking on internet, a transistor lets to amplify the signal at entrance. This is the PNP transistor: this transistor has 3 pins, a collector pin (the ground), the base pin and the emitter pin. first of all we need to place the buzzer on the breadboard. Use a wire to connect the positive pin to the 5v pin on the Raspberry GPIO. Then place the PN...

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