Wiring Wiz820io Ethernet Module to Teensy 3.1 (or 3.2)
He have a Teensy 3.1 and Wiz820io Ethernet Module He want to connect together. PJRC does sell a little shield for the Wiz820io, but He plan to mount the Teensy to a PCB and want to do the same with the Wiz820io rather than use this shield.
He immediately had issues which he incorrectly blamed on drivers. Had this been any MCU other than the Teensy, drivers would have been a good guess. He was puzzled as to why he would have driver issues given PJRC was selling the shield. It should work, yet didn’t.
To make a very long (as in 8 hours) story short, the root of the problem lies in the Wiz820io’s RESET pin. He finally discovered that you MUST properly provide power to this pin to get the Wiz820io up and running. When you do, the two lights on the Wiz820io will come on.
But even after discovering the necessity of the RESET pin, He could not get the drivers to work. In his research he found one person telling another to toss their Arduino Due and use a Teensy because the Teensyduino had all the necessary drivers. OK, He must be using the proper drivers, and now he know the trick of the RESET pin, what else is he missing?
PJRC shield wiring diagram
|Teensy3||SD Card||WIZ820io||MCP1825||JUMPER PADS|