60 IS: Raspberry Electronics Projects (60.html)

(To Enlarge . . . . . Click it.) Raspberry Pi 2 B GPIO pins.

(To Enlarge . . . . . Click it.) Led (with ground wire on the right)

(To Enlarge . . . . . Click it.) Reading Resistor Bands

(To Enlarge . . . . . Click it.) Pico and Pico W Pins

The first photo (above left) shows the Raspberry Pi 2 B GPIO pins. This layout is slightly different from the GPIO pins on the original Raspberry Pi because more pins have been added. Note that the GPIO name of each pin differs from the physical number of the pin. The name of each GPIO pin begins with the letters "GPIO" followed by the GPIO number. Raspbian is the recommended Operating System for the Raspberry Pi computer. The first project listed below explains how to use Terminal commands to communicate with your electronics using the GPIO pins.

In the second image, the "flat" spot of the Cathode (-) base of the LED is the side with the short lead (wire) on the right. The image shows a smaller portion of the rightmost lead. In a circuit, the short lead should be closest to the Ground connector.

The third photo above shows the color coding bands used to indicate the value of most resistors. The resistor example (at top) is Brown, Black, Red follwed by Green and finally Yellow. The value of this resistor is 1 0 2 followed by "x100K" then "+/-5%". which means 102 x 100K +/- 5% which is 10,200 K +/- 5% which is 10.2 Megohms +/- 5%.

The fourth photo (above right) shows the pins on the Raspberry Pi Pico and Pico W. The name of each GPI pin begins with the letters "GP" not "GPIO". Note that the GP pins on the Pico and on the Pico W are numbered differently compared to the GPIO pins on the Raspberry Pi computer boards. Some people use "GPI" instead of "GP" to designate the pins on the Pico. It is important to note that the pico has 3 ADC pins: ADC0, ADC1 and ADC2. These three pins provide an "Analog to Digital Conversion" capability, a feature that is totally lacking on every Raspberry Pi board.

Raspberry Pi Electronics Projects

• Project 01 Turning on an LED with your Raspberry Pi's GPIO Pins
  
  NB Raspberry Pi 2 B pins are different, so refer to the photo above.
    In an image (in the project article & below) the flat spot appears to be
    on the right which is wrong. Turn the diode around so that the flat spot
    is on the left. Connect the flat spot wire to the Ground Pin (physical
    pin # 6).Also notice that the yellow wire goes to Pi's physical pin 06
    and that physical pin 06 is the third pin on the top row of pins.

PiHut Project Diagram (Diode backwards).

Web Sources