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In Addition to my last blog how we can blink an led on the Photon:

Using SAP HCP, integration service to blink the lights on your Photon IoT device

We enhance this Sceanrio to display a message on a (two) LED matrix modul(es) (8×8).

Step 1: Wire the Photon

To wire our 2 modules we need the followig “Jumper” wires:

  • 1 x male to female (m-f)
  • 9 x male to male (m-m)

To connect the photon wit the matrix we we use the following pins from the photon:

  • 3V3
  • GND
  • A1
  • A2
  • A3

Step 2: Wire the LED matrix module 

Now we can (connect) plug the 2 led matrix modules on an breadboard:

And now it´s time to wire led matrix #1. The marix has the following inputs:

VCC-GND-DIN-CS-CLK

We wire now like this:

MATRIX VCC GND DIN CS CLK
PHOTON 3V3 GND A2 A1 A0

Matrix:

Photon:

To connect the 2nd matrix we´re using now one different pin, the DOUT pin from matrix #1 at the topside.

The Mapping is the following

MATRIX 1 VCC GND DOUT CS CLK
MATRIX 2 VCC GND DIN CS CLK

The complete wiring should now looks like this:

In the nex blog post i will show u how we use some coding an SAP HANA Cloud Platform, integration service to post an display our message.

cheers,
fabian

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