Tanmatsu: external add-on port
The external expansion port (CATT, for “Connect All The Things”) on Tanmatsu has been designed to be compatible with both PMOD and SAO add-on boards, in addition to it being a port that exposes 8 GPIOs and 3.3v power it can also be used as JTAG interface for the ESP32-P4.
Pinout
Pin | Function | Name | GPIO | Description | Notes |
---|
1 | | | | | |
2 | | | | | |
3 | | | | | |
4 | | | | | |
5 | | | | | |
6 | | | | | |
7 | | | | | |
8 | | | | | |
9 | | | | | |
10 | | | | | |
11 | | | | | |
12 | | | | | |
13 | | | | | |
14 | | | | | |
Limitations & warnings
- Total for all 3.3v outputs must not exceed 1A of current. It is generally adviced to stay well below this figure.
1 - SAO adapter
The CATT to SAO adapter is a small adapter board that converts the external add-on port of Tanmatsu into a standard “Simple Add-On” port as found on various event badges.

Assembling the adapter
The recommended method for assembling the adapter board is to start with the male pinheader connecting to Tanmatsu as this component is of lower height than the boxed female header for the SAO side. Make sure that the side of the board with the “CATT SAO” text is the side on which you plug in the connectors, assembling the board upside down will not work.
Pin mapping
Pinout
CATT | SAO | Description |
---|
1 | | |
2 | | |
3 | | |
4 | | |
5 | | |
6 | | |
7 | | |
8 | | |
9 | | |
10 | | |
11 | | |
12 | | |
13 | | |
14 | | |
Photos

