Dotstar wiring with the raspberry PI2

[alessandroferri]

Hi everyone,
I followed the instructions I found on:

https://learn.adafruit.com/adafruit-dot ... s?view=all

but I am unclear as I have to make the wiring with the DotStar Digital LED Strip and how do I wiring to the logic level shifter (eg 74AHCT125).
It seems to me that I must use the same connection that is located on:

https://learn.adafruit.com/light-painti ... i/hardware

Can I have a wiring diagram and a circuit diagram, as clear as possible, to connect the raspberry Pi2 with DotStar Digital LED Strip.

Best regards.

[adafruit_support_rick]

Try this: I think this is right:

dotstar_on_pi.png (325.14 KiB) Viewed 692 times

Pin 1 on the IC is the lower left. Didn't have a DotStar strip in the Fritzing library, so I used an LPD8806 strip instead. Wiring is the same.

The Pi wiring matches the definition in strandtest.py, here:
https://github.com/adafruit/Adafruit_DotStar_Pi

[alessandroferri]

Excuse me, but I never used the Half-size breadboard, so I really do not understand how the electrical connections are in the picture. The DotStart use the same ports of LPD8806? How you connect 74AHCT125 - Quad-Level Shifter?

Best regards

[adafruit_support_rick]

74HCT125 pin
1 - GND
2- GPIO 24
3- CI
4- GND
5- GPIO 23
6- DI
7-GND
14 - 5V

Dotstar
GND-GND
DI - 74HCT125 pin 6
CI- 74HCT125 pin 3
5V-5V

Pi Cobbler
GPIO 23 - 74HCT125 pin 5
GPIO 24 - 74HCT125 pin 2
GND-GND

[eliotw]

Just a follow up for future users: I just wired my dotstar/rpi with according to the diagram above, and it worked!