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GEX Zero (F072)/README.md

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+GEX Zero
+========
+
+This form factor is designed to be mechanically compatible with the
+Raspberry Pi Zero (W). This makes it possible to use PHATs and cases for the Pi Zero.
+
+Pins are mapped to the 20x2 header to maximize compatibility with PHATS. 
+Functions like UART, SPI and I2C should all be available.
+
+![render](gzrender.png)
+![top](gztop.png)
+![bot](gzb.png)
+
+
+## Pin mapping
+
+### Main header
+
+```none
+
+ 3V3   1 | 2   5V
+ PB7   3 | 4   5V
+ PB6   5 | 6   GND
+ PA8   7 | 8   PB10
+ GND   9 | 10  PB11
+ PB1  11 | 12  PB8
+PA10  13 | 14  GND
+ PB9  15 | 16  PA0
+ 3V3  17 | 18  PA1
+ PB5  19 | 20  GND
+ PB4  21 | 22  PA2
+ PB3  23 | 24  PA3
+ GND  25 | 26  PA4
+ PB2  27 | 28  PA5
+PC10  29 | 30  GND
+PC11  31 | 32  PA7
+ PB0  33 | 34  GND
+PB15  35 | 36  PA6
+PB12  37 | 38  PB14
+ GND  39 | 40  PB13
+
+```
+
+### Small header
+
+GND, Debug TX (PA9), PA13, PA14 (SWD)
+
+## Radio interface
+
+This board has a position for NRF24L01+.
+
+The radio module uses one of the SPI ports as alternate functions on some otherwise unused PC pins.
+PB12 and PB14 can only be used as regular GPIO when the radio link is enabled, not SPI. PB13 must be 
+left unconnected, as there is no available remap for the clock line.
+
+The radio module is used for remote control with the GEX Dongle and provides a fast, half duplex connection.

GEX Zero (F072)/rev.1/GEX_Zero.PrjPcbStructure

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+Record=TopLevelDocument|FileName=GEX_Zero.SchDoc