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Step 14Testing - Two displays
After the success of the last step I quickly assembled another display to test the chain-functionality.
This board had the crystal, the two extra capacitors and the ISP connector on in instead of the USB-chip and USB-connector.
Here I boldly soldered the microcontroller directly on the PCB since I had the ISP-connector to reprogram it with.
Without the slightly tricky surface mounted USB-chip to handle it didn't take many minutes to solder all parts to the board and then connect the new board together with the old by the four wires between the next- and prev-connectors.
After plugging it in to the USB both displays started up and were receiving commands perfectly.
Using the controlling software in my laptop I now could control both displays as the video in the second step showed.
(In the picture here you can clearly see the unfortunate via-holes in the upper right hand corner of the USB connector, between the words NEXT and X1. Without an insulator of some kind between the connector and the board they will be shorted by the metal in the USB-connctor.)
This board had the crystal, the two extra capacitors and the ISP connector on in instead of the USB-chip and USB-connector.
Here I boldly soldered the microcontroller directly on the PCB since I had the ISP-connector to reprogram it with.
Without the slightly tricky surface mounted USB-chip to handle it didn't take many minutes to solder all parts to the board and then connect the new board together with the old by the four wires between the next- and prev-connectors.
After plugging it in to the USB both displays started up and were receiving commands perfectly.
Using the controlling software in my laptop I now could control both displays as the video in the second step showed.
(In the picture here you can clearly see the unfortunate via-holes in the upper right hand corner of the USB connector, between the words NEXT and X1. Without an insulator of some kind between the connector and the board they will be shorted by the metal in the USB-connctor.)
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